[ { "id": "https://authors.library.caltech.eduhttps://authors.library.caltech.edu/records/dybsq-6gs03", "eprint_id": 17482, "eprint_status": "archive", "datestamp": "2023-08-19 01:25:06", "lastmod": "2023-10-19 23:55:56", "type": "article", "metadata_visibility": "show", "creators": { "items": [ { "id": "Tayebi-Noureddine", "name": { "family": "Tayebi", "given": "Noureddine" } }, { "id": "Narui-Yoshie", "name": { "family": "Narui", "given": "Yoshie" } }, { "id": "Franklin-N", "name": { "family": "Franklin", "given": "Nathan" } }, { "id": "Collier-C-P", "name": { "family": "Collier", "given": "C. Patrick" } }, { "id": "Giapis-K-P", "name": { "family": "Giapis", "given": "Konstantinos P." }, "orcid": "0000-0002-7393-298X" }, { "id": "Nishi-Yoshio", "name": { "family": "Nishi", "given": "Yoshio" } }, { "id": "Zhang-Yuegang", "name": { "family": "Zhang", "given": "Yuegang" } } ] }, "title": "Fully inverted single-digit nanometer domains in ferroelectric films", "ispublished": "pub", "full_text_status": "public", "note": "\u00a9 2010 American Institute of Physics.\n\nReceived 6 November 2009; accepted 5 December 2009; published 12 January 2010.\n\nPart of Y.Z.'s work was supported by the Office of Science,\nOffice of Basic Energy Sciences, of the U.S. Department\nof Energy under Contract No. DE-AC02-05CH11231.\n\n
Published - Tayebi2010p7046Appl_Phys_Lett.pdf
Supplemental Material - Supplementary_information_APL_format.pdf
", "abstract": "Achieving stable single-digit nanometer inverted domains in ferroelectric thin films is a fundamental issue that has remained a bottleneck for the development of ultrahigh density (>1 Tbit/in.^2) probe-based memory devices using ferroelectric media. Here, we demonstrate that such domains remain stable only if they are fully inverted through the entire ferroelectric film thickness, which is dependent on a critical ratio of electrode size to the film thickness. This understanding enables the formation of stable domains as small as 4 nm in diameter, corresponding to 10 unit cells in size. Such domain size corresponds to 40 Tbit/in.^2 data storage densities", "date": "2010-01-11", "date_type": "published", "publication": "Applied Physics Letters", "volume": "96", "number": "2", "publisher": "American Institute of Physics", "pagerange": "023103", "id_number": "CaltechAUTHORS:20100216-100459003", "issn": "0003-6951", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20100216-100459003", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "funders": { "items": [ { "agency": "Department of Energy (DOE)", "grant_number": "DE-AC02-05CH11231" } ] }, "doi": "10.1063/1.3280371", "primary_object": { "basename": "Supplementary_information_APL_format.pdf", "url": "https://authors.library.caltech.edu/records/dybsq-6gs03/files/Supplementary_information_APL_format.pdf" }, "related_objects": [ { "basename": "Tayebi2010p7046Appl_Phys_Lett.pdf", "url": "https://authors.library.caltech.edu/records/dybsq-6gs03/files/Tayebi2010p7046Appl_Phys_Lett.pdf" } ], "resource_type": "article", "pub_year": "2010", "author_list": "Tayebi, Noureddine; Narui, Yoshie; et el." }, { "id": "https://authors.library.caltech.eduhttps://authors.library.caltech.edu/records/sqpgj-5m418", "eprint_id": 15266, "eprint_status": "archive", "datestamp": "2023-08-20 02:04:16", "lastmod": "2023-10-18 21:35:28", "type": "article", "metadata_visibility": "show", "creators": { "items": [ { "id": "Liu-Yu", "name": { "family": "Liu", "given": "Yu" } }, { "id": "Jung-Seung-Yong", "name": { "family": "Jung", "given": "Seung-Yong" } }, { "id": "Collier-C-P", "name": { "family": "Collier", "given": "C. Patrick" } } ] }, "title": "Shear-Driven Redistribution of Surfactant Affects Enzyme Activity in Well-Mixed Femtoliter Droplets", "ispublished": "pub", "full_text_status": "public", "note": "\u00a9 2009 American Chemical Society. \n\nReceived for review March 26, 2009. Accepted May 4, 2009. Publication Date (Web): May 14, 2009. \n\nC.P.C. acknowledges support from the Center for Nanophase Materials Sciences, which is sponsored by the Division of Scientific User Facilities, Office of Basic Energy Sciences, U.S. Department of Energy. Research is sponsored in part by the Laboratory Directed Research and Development Program of Oak Ridge National Laboratory, managed by UT-Battelle, LLC, for the U.S. Department of Energy under Contract No. DE-AC05-00OR22725. The authors acknowledge assistance from the Micro-Nano Fabrication Laboratory at Caltech and the Beckman Institute Molecular Materials and Biological Imaging Resource Centers at Caltech. \n\nSupporting Information: Device fabrication, inlet and mixing stability tests, plug formation stability, droplet size distributions, optical calibration procedures, stability of trapped droplets, bulk Lineweaver\u2212Burk plot, control experiments against product inhibition of \u03b2-Gal enzymes by galactose, photoreactions involving singlet oxygen, photobleaching and loss of ions into the oil phase, correlation plots of enzyme activity, plug length and droplet diameter with backing pressure, estimation of capillary numbers based on the geometry of deformed daughter droplets, testing the role of the interface with inclusion of aqueous PEG600 as a crowding agent in droplets, comparison of droplet kinetics with traditional assays for detecting nonspecific adsorption, raw data from 1067 droplets, and description of statistical analysis. This material is available free of charge via the Internet at http://pubs.acs.org.\n\nSupplemental Material - ac900624h_si_001.pdf
Supplemental Material - ac900624h_si_002.pdf
", "abstract": "We developed a microfluidic platform for splitting well-mixed, femtoliter-volume droplets from larger water-in-oil plugs, where the sizes of the daughter droplets were not limited by channel width. These droplets were separated from mother plugs at a microfabricated T-junction, which enabled the study of how increased confinement affected enzyme kinetics in droplets 4\u221210 \u03bcm in diameter. Initial rates for enzyme catalysis in the mother plugs and the largest daughter drops were close to the average bulk rate, while the rates in smaller droplets decreased linearly with increasing surface to volume ratio. Rates in the smallest droplets decreased by a factor of 4 compared to the bulk rate. Traditional methods for detecting nonspecific adsorption at the water\u2212oil interface were unable to detect evidence of enzyme adsorption, including pendant drop tensiometry, laser scanning confocal microscopy of drops containing labeled proteins in microemulsions, and epifluorescence microscopy of plugs and drops generated on-chip. We propose the slowing of enzyme reaction kinetics in the smaller droplets was the result of increased adsorption and inactivation of enzymes at the water\u2212oil interface arising from transient interfacial shear stresses imparted on the daughter droplets as they split from the mother plugs and passed through the constricted opening of the T-junction. Such stresses are known to modulate the interfacial area and density of surfactant molecules that can passivate the interface. Bright field images of the splitting processes at the junction indicate that these stresses scaled with increasing surface to volume ratios of the droplets but were relatively insensitive to the average flow rate of plugs upstream of the junction.", "date": "2009-06-15", "date_type": "published", "publication": "Analytical Chemistry", "volume": "81", "number": "12", "publisher": "American Chemical Society", "pagerange": "4922-4928", "id_number": "CaltechAUTHORS:20090824-110432670", "issn": "0003-2700", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20090824-110432670", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "funders": { "items": [ { "agency": "Department of Energy (DOE)", "grant_number": "DE-AC05-00OR22725" } ] }, "doi": "10.1021/ac900624h", "primary_object": { "basename": "ac900624h_si_001.pdf", "url": "https://authors.library.caltech.edu/records/sqpgj-5m418/files/ac900624h_si_001.pdf" }, "related_objects": [ { "basename": "ac900624h_si_002.pdf", "url": "https://authors.library.caltech.edu/records/sqpgj-5m418/files/ac900624h_si_002.pdf" } ], "resource_type": "article", "pub_year": "2009", "author_list": "Liu, Yu; Jung, Seung-Yong; et el." }, { "id": "https://authors.library.caltech.eduhttps://authors.library.caltech.edu/records/vjtn4-ytf45", "eprint_id": 14761, "eprint_status": "archive", "datestamp": "2023-08-20 01:31:36", "lastmod": "2023-10-18 19:50:03", "type": "article", "metadata_visibility": "show", "creators": { "items": [ { "id": "Narui-Yoshie", "name": { "family": "Narui", "given": "Yoshie" } }, { "id": "Ceres-D-M", "name": { "family": "Ceres", "given": "Donato M." } }, { "id": "Chen-Jinyu", "name": { "family": "Chen", "given": "Jinyu" } }, { "id": "Giapis-K-P", "name": { "family": "Giapis", "given": "Konstantinos P." }, "orcid": "0000-0002-7393-298X" }, { "id": "Collier-C-P", "name": { "family": "Collier", "given": "C. Patrick" } } ] }, "title": "High aspect ratio silicon dioxide-coated single-walled carbon nanotube scanning probe nanoelectrodes", "ispublished": "pub", "full_text_status": "public", "note": "\u00a9 2009 American Chemical Society. \n\nReceived: February 5, 2009; Revised Manuscript Received: February 20, 2009. \n\nThe authors thank Carol Garland for assistance with TEM imaging. Nicholas Brunelli provided invaluable expertise with the ICP reactor. This work was supported by Arrowhead Research and Intel Corporation.\n\nSupplemental Material - Narui2009p2403J_Phys_Chem_C_supp.pdf
", "abstract": "We have fabricated high aspect ratio, hydrophilic nanoelectrodes from individual single-walled carbon nanotubes (SWNTs) mounted on conductive atomic force microscope (AFM) tips for use as electrochemical probes. Individual SWNTs with an average diameter of 5 nm and up to 1.5 \u03bcm in length were passivated with nanometer-thick SiO_2 films, deposited conformally in an inductively coupled plasma reactor. The electrically insulating SiO_2 films improved the nanotube rigidity and stabilized the nanotube\u2212AFM tip contact to enable use in aqueous environments. The nanotube tip was successfully exposed by subjecting the probe to nanosecond electrical pulse etching but only after electron beam irradiation in a transmission electron microscope (TEM). Probe functionality was verified by electrodepositing gold nanoparticles from aqueous solution only at the exposed tip.", "date": "2009-04-23", "date_type": "published", "publication": "Journal of Physical Chemistry C", "volume": "113", "number": "16", "publisher": "American Chemical Society", "pagerange": "6815-6820", "id_number": "CaltechAUTHORS:20090803-082921286", "issn": "1932-7447", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20090803-082921286", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "funders": { "items": [ { "agency": "Arrowhead Research" }, { "agency": "Intel Corporation" } ] }, "doi": "10.1021/jp901080e", "primary_object": { "basename": "Narui2009p2403J_Phys_Chem_C_supp.pdf", "url": "https://authors.library.caltech.edu/records/vjtn4-ytf45/files/Narui2009p2403J_Phys_Chem_C_supp.pdf" }, "resource_type": "article", "pub_year": "2009", "author_list": "Narui, Yoshie; Ceres, Donato M.; et el." }, { "id": "https://authors.library.caltech.eduhttps://authors.library.caltech.edu/records/y0wm5-agq75", "eprint_id": 11626, "eprint_status": "archive", "datestamp": "2023-08-22 13:00:57", "lastmod": "2023-10-17 15:15:15", "type": "article", "metadata_visibility": "show", "creators": { "items": [ { "id": "Tayebi-N", "name": { "family": "Tayebi", "given": "Noureddine" } }, { "id": "Narui-Yoshie", "name": { "family": "Narui", "given": "Yoshie" } }, { "id": "Chen-Robert-J", "name": { "family": "Chen", "given": "Robert J." } }, { "id": "Collier-C-P", "name": { "family": "Collier", "given": "C. Patrick" } }, { "id": "Giapis-K-P", "name": { "family": "Giapis", "given": "Konstantinos P." }, "orcid": "0000-0002-7393-298X" }, { "id": "Zhang-Yuegang", "name": { "family": "Zhang", "given": "Yuegang" } } ] }, "title": "Nanopencil as a wear-tolerant probe for ultrahigh density data storage", "ispublished": "pub", "full_text_status": "public", "keywords": "carbon nanotubes, dielectric thin films, electrodes, nanotechnology, random-access storage, silicon compounds, wear resistance", "note": "\u00a9 2008 American Institute of Physics. \n\nReceived 17 July 2008; accepted 19 August 2008; published 11 September 2008.\n\nPublished - TAYapl08.pdf
Supplemental Material - 033837APL-methods.doc
Supplemental Material - README.TXT
", "abstract": "A dielectric-sheathed carbon nanotube probe, resembling a \"nanopencil,\" has been fabricated by conformal deposition of silicon-oxide on a carbon nanotube and subsequent \"sharpening\" to expose its tip. The high aspect-ratio nanopencil probe takes advantage of the small nanotube electrode size, while avoiding bending and buckling issues encountered with naked or polymer-coated carbon nanotube probes. Since the effective electrode diameter of the probe would not change even after significant wear, it is capable of long-lasting read/write operations in contact mode with a bit size of several nanometers.", "date": "2008-09-08", "date_type": "published", "publication": "Applied Physics Letters", "volume": "93", "number": "10", "publisher": "American Institute of Physics", "pagerange": "Art. No. 103112", "id_number": "CaltechAUTHORS:TAYapl08", "issn": "0003-6951", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:TAYapl08", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "doi": "10.1063/1.2981641", "primary_object": { "basename": "033837APL-methods.doc", "url": "https://authors.library.caltech.edu/records/y0wm5-agq75/files/033837APL-methods.doc" }, "related_objects": [ { "basename": "README.TXT", "url": "https://authors.library.caltech.edu/records/y0wm5-agq75/files/README.TXT" }, { "basename": "TAYapl08.pdf", "url": "https://authors.library.caltech.edu/records/y0wm5-agq75/files/TAYapl08.pdf" } ], "resource_type": "article", "pub_year": "2008", "author_list": "Tayebi, Noureddine; Narui, Yoshie; et el." }, { "id": "https://authors.library.caltech.eduhttps://authors.library.caltech.edu/records/4qj1j-48121", "eprint_id": 79316, "eprint_status": "archive", "datestamp": "2023-08-19 22:41:36", "lastmod": "2023-10-26 14:48:04", "type": "article", "metadata_visibility": "show", "creators": { "items": [ { "id": "Jung-Seung-Yong", "name": { "family": "Jung", "given": "Seung-Yong" } }, { "id": "Liu-Yu", "name": { "family": "Liu", "given": "Yu" } }, { "id": "Collier-C-P", "name": { "family": "Collier", "given": "C. Patrick" } } ] }, "title": "Fast Mixing and Reaction Initiation Control of Single-Enzyme Kinetics in Confined Volumes", "ispublished": "pub", "full_text_status": "public", "note": "\u00a9 2008 American Chemical Society. \n\nReceived 7 January 2008. Published online 25 March 2008. Published in print 1 May 2008. \n\nThe authors thank Alireza Ghaffari at the Micro Nano Fabrication Laboratory at Caltech for help with microfluidic device fabrication.\n\nSupplemental Material - la800053e.pdf
", "abstract": "A device with femtoliter-scale chambers and controlled reaction initiation was developed for single-molecule enzymology. Initially separated substrate and enzyme streams were rapidly mixed in a microfluidic device and encapsulated in an array of individual microreactors, allowing for enzyme kinetics to be monitored with millisecond dead times and single-molecule sensitivity. Because the arrays of chambers were fabricated by micromolding in PDMS, the chambers were monodisperse in size, and the chamber volume could be systematically controlled. Microreactors could be purged and replenished with fresh reactants for consecutive rounds of observation. Repeated experiments with statistically identical initial conditions could be performed rapidly, with zero cross-talk between chambers in the array.", "date": "2008-05-06", "date_type": "published", "publication": "Langmuir", "volume": "24", "number": "9", "publisher": "American Chemical Society", "pagerange": "4439-4442", "id_number": "CaltechAUTHORS:20170725-072343286", "issn": "0743-7463", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20170725-072343286", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "doi": "10.1021/la800053e", "primary_object": { "basename": "la800053e.pdf", "url": "https://authors.library.caltech.edu/records/4qj1j-48121/files/la800053e.pdf" }, "resource_type": "article", "pub_year": "2008", "author_list": "Jung, Seung-Yong; Liu, Yu; et el." }, { "id": "https://authors.library.caltech.eduhttps://authors.library.caltech.edu/records/6b4qf-c9j63", "eprint_id": 79740, "eprint_status": "archive", "datestamp": "2023-08-19 18:23:17", "lastmod": "2023-10-26 17:04:54", "type": "article", "metadata_visibility": "show", "creators": { "items": [ { "id": "Kutana-A", "name": { "family": "Kutana", "given": "A." } }, { "id": "Giapis-K-P", "name": { "family": "Giapis", "given": "K. P." }, "orcid": "0000-0002-7393-298X" }, { "id": "Chen-Jun-Yuan", "name": { "family": "Chen", "given": "J.-Y-" } }, { "id": "Collier-C-P", "name": { "family": "Collier", "given": "C. P." } } ] }, "title": "Amplitude Response of Single-Wall Carbon Nanotube Probes during Tapping Mode Atomic Force Microscopy: Modeling and Experiment", "ispublished": "pub", "full_text_status": "restricted", "note": "\u00a9 2006 American Chemical Society. \n\nReceived April 13, 2006; Revised Manuscript Received July 6, 2006. Publication Date (Web): July 26, 2006. \n\nThis work was supported in part by NSF (CTS-0508096).", "abstract": "Imaging of surfaces with carbon nanotube probes in tapping mode results frequently in complex behavior in the amplitude\u2212distance curves monitored. Using molecular mechanics simulations, we calculate the force exerted on a nanotube pressed against a smooth surface as it undergoes deformation and buckling. This nonlinear force is then used in a macroscopic equation, describing the response of a damped harmonic oscillator, to predict the amplitude response of a nanotube AFM probe. Similarities between the prediction and experiment suggest that the complex amplitude response seen in the experiment may be explained by the nonlinearity in the force exerted on the nanotube and thus must not necessarily be related to the structure of the surface.", "date": "2006-08", "date_type": "published", "publication": "Nano Letters", "volume": "6", "number": "8", "publisher": "American Chemical Society", "pagerange": "1669-1673", "id_number": "CaltechAUTHORS:20170802-084721974", "issn": "1530-6984", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20170802-084721974", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "funders": { "items": [ { "agency": "NSF", "grant_number": "CTS-0508096" } ] }, "doi": "10.1021/nl060831o", "resource_type": "article", "pub_year": "2006", "author_list": "Kutana, A.; Giapis, K. P.; et el." }, { "id": "https://authors.library.caltech.eduhttps://authors.library.caltech.edu/records/x2asx-fc876", "eprint_id": 52021, "eprint_status": "archive", "datestamp": "2023-08-19 16:49:21", "lastmod": "2023-10-18 19:16:13", "type": "article", "metadata_visibility": "show", "creators": { "items": [ { "id": "Chen-Jun-Yuan", "name": { "family": "Chen", "given": "J. Y." } }, { "id": "Kutana-A", "name": { "family": "Kutana", "given": "A." } }, { "id": "Collier-C-P", "name": { "family": "Collier", "given": "C. P." } }, { "id": "Giapis-K-P", "name": { "family": "Giapis", "given": "K. P." }, "orcid": "0000-0002-7393-298X" } ] }, "title": "Electrowetting in Carbon Nanotubes", "ispublished": "pub", "full_text_status": "public", "note": "\u00a9 2005 American Association for the Advancement of Science.\n\n20 September 2005; Accepted 1 November 2005.\n\nWe thank C. Garland for TEM assistance. Supported in part by NSF (grants CTS-0404353 and CTS-0508096) and in part by the Arrowhead Research Corporation.\n\nSupplemental Material - ChenJ.SOM.pdf
", "abstract": "We demonstrate reversible wetting and filling of open single-wall carbon nanotubes with mercury by means of electrocapillary pressure originating from the application of a potential across an individual nanotube in contact with a mercury drop. Wetting improves the conductance in both metallic and semiconducting nanotube probes by decreasing contact resistance and forming a mercury nanowire inside the nanotube. Molecular dynamics simulations corroborate the electrocapillarity-driven filling process and provide estimates for the imbibition speed and electrocapillary pressure.", "date": "2005-12-02", "date_type": "published", "publication": "Science", "volume": "310", "number": "5753", "publisher": "American Association for the Advancement of Science", "pagerange": "1480-1483", "id_number": "CaltechAUTHORS:20141120-151456893", "issn": "0036-8075", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20141120-151456893", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "funders": { "items": [ { "agency": "NSF", "grant_number": "CTS-0404353" }, { "agency": "NSF", "grant_number": "CTS-0508096" }, { "agency": "Arrowhead Research Corporation" } ] }, "doi": "10.1126/science.1120385", "primary_object": { "basename": "ChenJ.SOM.pdf", "url": "https://authors.library.caltech.edu/records/x2asx-fc876/files/ChenJ.SOM.pdf" }, "resource_type": "article", "pub_year": "2005", "author_list": "Chen, J. Y.; Kutana, A.; et el." }, { "id": "https://authors.library.caltech.eduhttps://authors.library.caltech.edu/records/py9a3-9p431", "eprint_id": 42367, "eprint_status": "archive", "datestamp": "2023-08-19 16:08:51", "lastmod": "2023-10-25 15:52:41", "type": "article", "metadata_visibility": "show", "creators": { "items": [ { "id": "Wade-L-A", "name": { "family": "Wade", "given": "Lawrence A." } }, { "id": "Collier-C-P", "name": { "family": "Collier", "given": "C. Patrick" } }, { "id": "Fraser-S-E", "name": { "family": "Fraser", "given": "Scott" }, "orcid": "0000-0002-5377-0223" } ] }, "title": "Single-Biomolecule Resolution Imaging with an Optical Microscope", "ispublished": "pub", "full_text_status": "public", "note": "\u00a9 2005 Microscopy Society of America.\nPublished online: 01 August 2005.\nExtended abstract of a paper presented at Microscopy and Microanalysis 2005 in Honolulu, Hawaii, USA, July 31-August 4, 2005.\n\nThis work was supported by NASA/JPL Research and Technology Development and Bio-Nano\nPrograms, the Caltech President's Fund, NIH, Pharmagenomics and Arrowhead Research.\n\nPublished - Wade_2005p146.pdf
", "abstract": "A Fluorescence Apertureless Near-field Scanning Optical Microscope (FANSOM) has been\ndeveloped with FWHM optical resolution below 10 nm when imaging at ~600 nm wavelengths [1].\nThe apparatus combines an epi fluorescence optical microscope and an atomic force microscope\n(AFM) to obtain single-molecule sensitivity and optical resolution limited by the sharpness of the\nAFM probe. The AFM probe is used to stimulate or reduce the detected fluorescence emission rate\ndepending on the AFM tip material and the polarization of the excitation light. The probe-sample\ninteraction is described by near-field dipole-dipole physics, resulting in a stimulated emission rate\nthat varies by r^6. When tapping the probe over the substrate being imaged, the near-field component\nis sharply modulated at that tapping frequency, thereby enabling separation from the far-field\nbackground during post-processing. Images of fluorescent single-molecules taken in a physiological\nenvironment will be presented.", "date": "2005-08", "date_type": "published", "publication": "Microscopy and Microanalysis", "volume": "11", "number": "S2", "publisher": "Cambridge University Press", "pagerange": "146-147", "id_number": "CaltechAUTHORS:20131112-083548976", "issn": "1431-9276", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20131112-083548976", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "funders": { "items": [ { "agency": "NASA/JPL Research and Technology Development and Bio-Nano Programs" }, { "agency": "Caltech President's Fund" }, { "agency": "NIH" }, { "agency": "Pharmagenomics" }, { "agency": "Arrowhead Research" } ] }, "doi": "10.1017/S1431927605509905", "primary_object": { "basename": "Wade_2005p146.pdf", "url": "https://authors.library.caltech.edu/records/py9a3-9p431/files/Wade_2005p146.pdf" }, "resource_type": "article", "pub_year": "2005", "author_list": "Wade, Lawrence A.; Collier, C. Patrick; et el." }, { "id": "https://authors.library.caltech.eduhttps://authors.library.caltech.edu/records/jtrcc-xbj64", "eprint_id": 77965, "eprint_status": "archive", "datestamp": "2023-08-19 15:59:08", "lastmod": "2023-10-25 23:36:53", "type": "article", "metadata_visibility": "show", "creators": { "items": [ { "id": "Solares-S-D", "name": { "family": "Solares", "given": "Santiago D." }, "orcid": "0000-0003-0895-8160" }, { "id": "Esplandiu-M-J", "name": { "family": "Esplandiu", "given": "Maria J." }, "orcid": "0000-0003-2079-0639" }, { "id": "Goddard-W-A-III", "name": { "family": "Goddard", "given": "William A., III" }, "orcid": "0000-0003-0097-5716" }, { "id": "Collier-C-P", "name": { "family": "Collier", "given": "C. Patrick" } } ] }, "title": "Mechanisms of Single-Walled Carbon Nanotube Probe\u2212Sample Multistability in Tapping Mode AFM Imaging", "ispublished": "pub", "full_text_status": "public", "note": "\u00a9 2005 American Chemical Society. \n\nReceived 15 March 2005. Published online 24 May 2005. Published in print 1 June 2005. \n\nS.D.S. and W.A.G. were supported by the Microelectronics Advanced Research Corporation (MARCO) and its Focus Center on Function Engineered Nano Architectonics (FENA). M.J.E. and C.P.C. were supported by Arrowhead Research.\n\nSupplemental Material - jp051363usi20050423_115543.pdf
", "abstract": "When using single-walled carbon nanotube (SWNT) probes to create AFM images of SWNT samples in tapping mode, elastic deformations of the probe and sample result in a decrease in the apparent width of the sample. Here we show that there are two major mechanisms for this effect, smooth gliding and snapping, and compare their dynamics to the case when a conventional silicon tip is used to image a bare silicon surface. Using atomistic and continuum simulations, we analyze in detail the shape of the tip\u2212sample interaction potential for three model cases and show that in the absence of adhesion and friction forces, more than two discrete, physically meaningful solutions of the oscillation amplitude are possible when snapping occurs (in contrast to the existence of one attractive and one repulsive solution for conventional silicon AFM tips). We present experimental results indicating that a continuum of amplitude solutions is possible when using SWNT tips and explain this phenomenon with dynamic simulations that explicitly include tip\u2212sample adhesion and friction forces. We also provide simulation results of SWNT tips imaging Si(111)\u2212CH_3 surface step edges and Au nanocrystals, which indicate that SWNT probe multistability may be a general phenomenon, not limited to SWNT samples.", "date": "2005-06-16", "date_type": "published", "publication": "Journal of Physical Chemistry B", "volume": "109", "number": "23", "publisher": "American Chemical Society", "pagerange": "11493-11500", "id_number": "CaltechAUTHORS:20170606-103827773", "issn": "1520-6106", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20170606-103827773", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "funders": { "items": [ { "agency": "Microelectronics Advanced Research Corporation (MARCO)" }, { "agency": "Center on Functional Engineered NanoArchitectonics (FENA)" }, { "agency": "Arrowhead Research" } ] }, "doi": "10.1021/jp051363u", "primary_object": { "basename": "jp051363usi20050423_115543.pdf", "url": "https://authors.library.caltech.edu/records/jtrcc-xbj64/files/jp051363usi20050423_115543.pdf" }, "resource_type": "article", "pub_year": "2005", "author_list": "Solares, Santiago D.; Esplandiu, Maria J.; et el." }, { "id": "https://authors.library.caltech.eduhttps://authors.library.caltech.edu/records/6yke6-hdm46", "eprint_id": 77961, "eprint_status": "archive", "datestamp": "2023-08-19 15:42:17", "lastmod": "2023-10-25 23:36:34", "type": "article", "metadata_visibility": "show", "creators": { "items": [ { "id": "Chen-Jinyu", "name": { "family": "Chen", "given": "Jinyu" } }, { "id": "Collier-C-P", "name": { "family": "Collier", "given": "C. Patrick" } } ] }, "title": "Noncovalent Functionalization of Single-Walled Carbon Nanotubes with Water-Soluble Porphyrins", "ispublished": "pub", "full_text_status": "restricted", "note": "\u00a9 2005 American Chemical Society. \n\nReceived 21 January 2005. Published online 6 April 2005. Published in print 1 April 2005. \n\nThis work was supported by Arrowhead Research. We thank Yoshie Narui for help with the fluorescence measurements.", "abstract": "We have employed water-soluble porphyrin molecules [meso-(tetrakis-4-sulfonatophenyl) porphine dihydrochloride] to solubilize single-walled carbon nanotubes (SWNTs), resulting in aqueous solutions that are stable for several weeks. The porphyrin-nanotube complexes have been characterized with absorption and fluorescence spectroscopy and with AFM. We find that the porphyrin/SWNT interaction is selective for the free base form, and that this interaction stabilizes the free base against protonation to the diacid. Under mildly acidic conditions nanotube-mediated J-aggregates form, which are unstable in solution and result in precipitation of the nanotubes over the course of a few days. Porphyrin-coated SWNTs can be precisely aligned on hydrophilic poly(dimethylsiloxane) (PDMS) surfaces by combing SWNT solution along a desired direction and then transferred to silicon substrates by stamping. Parallel SWNT patterns have been fabricated in this manner.", "date": "2005-04-28", "date_type": "published", "publication": "Journal of Physical Chemistry B", "volume": "109", "number": "16", "publisher": "American Chemical Society", "pagerange": "7605-7609", "id_number": "CaltechAUTHORS:20170606-082255211", "issn": "1520-6106", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20170606-082255211", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "funders": { "items": [ { "agency": "Arrowhead Research" } ] }, "doi": "10.1021/jp050389i", "resource_type": "article", "pub_year": "2005", "author_list": "Chen, Jinyu and Collier, C. Patrick" }, { "id": "https://authors.library.caltech.eduhttps://authors.library.caltech.edu/records/g69b6-fx333", "eprint_id": 79581, "eprint_status": "archive", "datestamp": "2023-08-19 14:38:11", "lastmod": "2023-10-26 16:57:42", "type": "article", "metadata_visibility": "show", "creators": { "items": [ { "id": "Jung-Hyungil", "name": { "family": "Jung", "given": "Hyungil" } }, { "id": "Dalal-C-K", "name": { "family": "Dalal", "given": "Chiraj K." }, "orcid": "0000-0002-3624-8409" }, { "id": "Kuntz-S", "name": { "family": "Kuntz", "given": "Steven" } }, { "id": "Shah-Raman", "name": { "family": "Shah", "given": "Raman" } }, { "id": "Collier-C-P", "name": { "family": "Collier", "given": "C. Patrick" } } ] }, "title": "Surfactant Activated Dip-Pen Nanolithography", "ispublished": "pub", "full_text_status": "public", "note": "\u00a9 2004 American Chemical Society.\n\nReceived 10 August 2004;\nPublished online 2 October 2004;\nPublished in print 1 November 2004.\n\nThe authors thank Prof. Jim Heath (Caltech) for use of the contact angle goniometer, and Dr. Lorenzo Busoni and Prof. Marcello Carl\u00e0 (University of Florence) for help with the axisymmetric drop shape analysis program. R.S. acknowledges support from the Student-Faculty Programs Office at Caltech and the Arthur Amos Noyes SURF Endowment for a summer undergraduate research fellowship. This work was supported by Caltech startup funds and by Arrowhead Research.\n\nSupplemental Material - nl048705csi20040927_044734.pdf
", "abstract": "Direct nanoscale patterning of maleimide-linked biotin on mercaptosilane-functionalized glass substrates using dip-pen nanolithography (DPN) was facilitated by the addition of a small amount of the biocompatible nonionic surfactant Tween-20. A correlation was found between activated biotin transfer from the AFM tip with surfactant included in the ink and an increase in the wettability of the partially hydrophobic silanized substrate. Surfactant concentration represents a new control variable for DPN that complements relative humidity, tip\u2212substrate contact force, scan speed, and temperature. Using surfactants systematically as ink additives may expand the possible ink\u2212substrate combinations that can be used for patterning biotin and other biomolecules, including proteins.", "date": "2004-11", "date_type": "published", "publication": "Nano Letters", "volume": "4", "number": "11", "publisher": "American Chemical Society", "pagerange": "2171-2177", "id_number": "CaltechAUTHORS:20170731-090555460", "issn": "1530-6984", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20170731-090555460", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "funders": { "items": [ { "agency": "Caltech" }, { "agency": "Arrowhead Research" } ] }, "doi": "10.1021/nl048705c", "primary_object": { "basename": "nl048705csi20040927_044734.pdf", "url": "https://authors.library.caltech.edu/records/g69b6-fx333/files/nl048705csi20040927_044734.pdf" }, "resource_type": "article", "pub_year": "2004", "author_list": "Jung, Hyungil; Dalal, Chiraj K.; et el." }, { "id": "https://authors.library.caltech.eduhttps://authors.library.caltech.edu/records/bg6ca-18441", "eprint_id": 79407, "eprint_status": "archive", "datestamp": "2023-08-19 14:23:50", "lastmod": "2023-10-26 16:11:35", "type": "article", "metadata_visibility": "show", "creators": { "items": [ { "id": "Esplandiu-M-J", "name": { "family": "Esplandiu", "given": "Maria J." } }, { "id": "Bittner-V-G", "name": { "family": "Bittner", "given": "Vern G." } }, { "id": "Giapis-K-P", "name": { "family": "Giapis", "given": "Konstantinos P." }, "orcid": "0000-0002-7393-298X" }, { "id": "Collier-C-P", "name": { "family": "Collier", "given": "C. Patrick" } } ] }, "title": "Nanoelectrode Scanning Probes from Fluorocarbon-Coated Single-Walled Carbon Nanotubes", "ispublished": "pub", "full_text_status": "public", "note": "\u00a9 2004 American Chemical Society. \n\nReceived June 29, 2004; Revised Manuscript Received July 29, 2004. Publication Date (Web): August 19, 2004. \n\nThe authors thank Lawrence Wade, Jordan Gerton, and David Lopez for helpful discussions. We acknowledge Dr. P.-L-M. Noeske, Fraunhofer Institute, IFAM, Bremen for expertise in the measurements of XPS spectra at high resolution and at low fluorocarbon film thicknesses. We also acknowledge the help of Shannon Lewis with XPS measurements and Carol Garland with TEM imaging. This work was supported by Caltech startup funds and by Arrowhead Research.\n\nSupplemental Material - nl048991ssi20040729_081150.pdf
", "abstract": "We have developed a method to coat single-walled carbon nanotubes attached to AFM tips with conformal fluorocarbon polymer films formed in an inductively coupled plasma reactor. The polymer provides a chemically inert and electrically insulating outer layer and mechanically stabilizes the attached nanotube sufficiently to enable imaging in liquids without the need for an intervening adhesive. Electrical pulse etching of the insulating coating exclusively at the nanotube tip end results in well-defined highly conductive nanoelectrodes. For these probes, the conductive properties of the nanotubes are not affected by the coating. Some nanoelectrodes behave as rectifying diodes, which may be developed into novel molecular devices integrated onto scanning probes.", "date": "2004-10", "date_type": "published", "publication": "Nano Letters", "volume": "4", "number": "10", "publisher": "American Chemical Society", "pagerange": "1873-1879", "id_number": "CaltechAUTHORS:20170726-100807359", "issn": "1530-6984", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20170726-100807359", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "funders": { "items": [ { "agency": "Caltech" }, { "agency": "Arrowhead Research" } ] }, "doi": "10.1021/nl048991s", "primary_object": { "basename": "nl048991ssi20040729_081150.pdf", "url": "https://authors.library.caltech.edu/records/bg6ca-18441/files/nl048991ssi20040729_081150.pdf" }, "resource_type": "article", "pub_year": "2004", "author_list": "Esplandiu, Maria J.; Bittner, Vern G.; et el." }, { "id": "https://authors.library.caltech.eduhttps://authors.library.caltech.edu/records/55dkw-a5p14", "eprint_id": 77696, "eprint_status": "archive", "datestamp": "2023-08-19 14:15:03", "lastmod": "2023-10-25 23:21:51", "type": "article", "metadata_visibility": "show", "creators": { "items": [ { "id": "Shapiro-I-R", "name": { "family": "Shapiro", "given": "Ian R." } }, { "id": "Solares-S-D", "name": { "family": "Solares", "given": "Santiago D." }, "orcid": "0000-0003-0895-8160" }, { "id": "Esplandiu-M-J", "name": { "family": "Esplandiu", "given": "Maria J." }, "orcid": "0000-0003-2079-0639" }, { "id": "Wade-L-A", "name": { "family": "Wade", "given": "Lawrence A." } }, { "id": "Goddard-W-A-III", "name": { "family": "Goddard", "given": "William A., III" }, "orcid": "0000-0003-0097-5716" }, { "id": "Collier-C-P", "name": { "family": "Collier", "given": "C. Patrick" } } ] }, "title": "Influence of Elastic Deformation on Single-Wall Carbon Nanotube Atomic Force Microscopy Probe Resolution", "ispublished": "pub", "full_text_status": "public", "note": "\u00a9 2004 American Chemical Society. \n\nReceived: May 14, 2004. Publication Date (Web): August 17, 2004. \n\nWe thank Professor Stephen Quake, Dr. Jordan Gerton, and Ms. Yuki Matsuda for essential discussions. I.R.S., M.J.E., and C.P.C. were supported by Caltech startup funds and by Arrowhead Research. S.D.S. and W.A.G. were supported by NSF-NIRT Grant CTS-0103002, and by the Microelectronics Advanced Research Corporation (MARCO) and its Focus Center on Function Engineered NanoArchitectonics (FENA). L.A.W. was supported by the Caltech President's Fund and NASA Contract NAS7-1407.\n\nSupplemental Material - jp047937xsi20040514_032619.pdf
", "abstract": "We have previously reported that 4\u22126 nm diameter single-wall carbon nanotube (SWNT) probes used for tapping-mode atomic force microscopy (AFM) can exhibit lateral resolution that is significantly better than the probe diameter when prone nanotubes are imaged on a flat SiO_2 surface. To further investigate this phenomenon, accurate models for use in atomistic molecular dynamics simulations were constructed on the basis of transmission electron microscopy (TEM) and AFM data. Probe\u2212sample interaction potentials were generated by utilization of force fields derived from ab initio quantum mechanics calculations and material bulk and surface properties, and the resulting force curves were integrated numerically with the AFM cantilever equation of motion. The simulations demonstrate that, under the AFM imaging conditions employed, elastic deformations of both the probe and sample nanotubes result in a decrease of the apparent width of the sample. This behavior provides an explanation for the unexpected resolution improvement and illustrates some of the subtleties involved when imaging is performed with SWNT probes in place of conventional silicon probes. However, the generality of this phenomenon for other AFM imaging applications employing SWNT probes remains to be explored.", "date": "2004-09-09", "date_type": "published", "publication": "Journal of Physical Chemistry B", "volume": "108", "number": "36", "publisher": "American Chemical Society", "pagerange": "13613-13618", "id_number": "CaltechAUTHORS:20170524-090043354", "issn": "1520-6106", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20170524-090043354", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "funders": { "items": [ { "agency": "Arrowhead Research" }, { "agency": "NSF", "grant_number": "CTS-0103002" }, { "agency": "Microelectronics Advanced Research Corporation (MARCO)" }, { "agency": "Focus Center on Function Engineered NanoArchitectonics (FENA)" }, { "agency": "NASA", "grant_number": "NAS7-1407" }, { "agency": "Caltech President's Fund" } ] }, "doi": "10.1021/jp047937x", "primary_object": { "basename": "jp047937xsi20040514_032619.pdf", "url": "https://authors.library.caltech.edu/records/55dkw-a5p14/files/jp047937xsi20040514_032619.pdf" }, "resource_type": "article", "pub_year": "2004", "author_list": "Shapiro, Ian R.; Solares, Santiago D.; et el." }, { "id": "https://authors.library.caltech.eduhttps://authors.library.caltech.edu/records/4ah8d-mfw83", "eprint_id": 79745, "eprint_status": "archive", "datestamp": "2023-08-19 13:22:14", "lastmod": "2023-10-26 17:05:07", "type": "article", "metadata_visibility": "show", "creators": { "items": [ { "id": "Wade-L-A", "name": { "family": "Wade", "given": "Lawrence A." } }, { "id": "Shapiro-I-R", "name": { "family": "Shapiro", "given": "Ian R." } }, { "id": "Ma-Ziyang", "name": { "family": "Ma", "given": "Ziyang" } }, { "id": "Quake-S-R", "name": { "family": "Quake", "given": "Stephen R." } }, { "id": "Collier-C-P", "name": { "family": "Collier", "given": "C. Patrick" } } ] }, "title": "Correlating AFM Probe Morphology to Image Resolution for Single-Wall Carbon Nanotube Tips", "ispublished": "pub", "full_text_status": "public", "note": "\u00a9 2004 American Chemical Society. \n\nReceived 2 January 2004. Published online 17 February 2004. Published in print 1 April 2004. \n\nThe authors thank Jason Hafner, Jim Hone, and Jordan Gerton for fruitful discussions and suggestions. We also thank Carol Garland for many patient hours of TEM imaging and NanoDevices, Santa Barbara, CA for providing direct growth nanotube tips for characterization. Wade, Ma, and Quake were supported by a grant from Pharmagenomix; Shapiro and Collier were supported by Caltech startup funds. Wade, Shapiro, and Collier were also supported by the Caltech President's Fund and NASA contract NAS7-1407.\n\nSupplemental Material - nl049976qsi20040212_032314.pdf
", "abstract": "We report local-field-enhanced light emission from silicon nanocrystals close to a film of nanoporous gold. We resolve photoluminescence as the gold\u2212Si nanocrystal separation distance is varied between 0 and 20 nm and observe a fourfold luminescence intensity enhancement concomitant with increases in the coupled silicon nanocrystal/nanoporous gold absorbance cross section and radiative decay rate. A detailed analysis of the luminescence data indicated a local-field-enhanced quantum efficiency of 58% for the Si nanocrystals coupled to the nanoporous gold layer.", "date": "2004-04", "date_type": "published", "publication": "Nano Letters", "volume": "4", "number": "4", "publisher": "American Chemical Society", "pagerange": "725-731", "id_number": "CaltechAUTHORS:20170802-095502414", "issn": "1530-6984", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20170802-095502414", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "funders": { "items": [ { "agency": "Pharmagenomix" }, { "agency": "Caltech President's Fund" }, { "agency": "NASA", "grant_number": "NAS7-1407" } ] }, "doi": "10.1021/nl049976q", "primary_object": { "basename": "nl049976qsi20040212_032314.pdf", "url": "https://authors.library.caltech.edu/records/4ah8d-mfw83/files/nl049976qsi20040212_032314.pdf" }, "resource_type": "article", "pub_year": "2004", "author_list": "Wade, Lawrence A.; Shapiro, Ian R.; et el." }, { "id": "https://authors.library.caltech.eduhttps://authors.library.caltech.edu/records/vvmfb-77446", "eprint_id": 76936, "eprint_status": "archive", "datestamp": "2023-09-22 22:38:32", "lastmod": "2023-10-23 23:25:40", "type": "article", "metadata_visibility": "show", "creators": { "items": [ { "id": "Jung-Hyungil", "name": { "family": "Jung", "given": "Hyungil" } }, { "id": "Kulkarni-R-P", "name": { "family": "Kulkarni", "given": "Rajan" } }, { "id": "Collier-C-P", "name": { "family": "Collier", "given": "C. Patrick" } } ] }, "title": "Dip-Pen Nanolithography of Reactive Alkoxysilanes on Glass", "ispublished": "pub", "full_text_status": "public", "note": "\u00a9 2003 American Chemical Society. \n\nReceived May 27, 2003. Publication Date (Web): September 11, 2003. \n\nThis work was supported by Caltech startup funds. We thank Dr. Maria Esplandiu for help with tapping mode AFM imaging in water.\n\nSupplemental Material - ja0363720si20030824_013459.pdf
", "abstract": "The use of organofunctional silane chemistry is a flexible and general method for immobilizing biomolecules on silicon oxide surfaces, including fabricating DNA, small-molecule, and protein microarrays. The biggest hurdle in employing dip-pen nanolithography (DPN) for extending this general approach to the nanoscopic domain is the tendency of trialkoxy- and trichlorosilanes to rapidly polymerize due to hydrolysis reactions. The control of the local water concentration between the substrate surface and the scanning AFM tip is critical, both to the physical and chemical processes involved in DPN writing and to the ability to form well-defined thin layers of reactive silanes without extensive polymerization induced disorder. We found that we could control the degree of polymerization through careful choice of the alkoxysilane used as the \"ink\" for DPN and through control of the relative humidity during inking and writing with the coated AFM tip. As a proof-of-principle, we demonstrate that areas patterned with an alkoxysilane on glass with DPN are functional for subsequent immobilization of fluorescently labeled streptavidin via covalent attachment of biotin. This preliminary result sets the stage for the ability to capture proteins in their fully hydrated state from buffered solution, by molecular recognition onto previously written reactive nanoscopic regions on oxidized silicon and glass.", "date": "2003-10-08", "date_type": "published", "publication": "Journal of the American Chemical Society", "volume": "125", "number": "40", "publisher": "American Chemical Society", "pagerange": "12096-12097", "id_number": "CaltechAUTHORS:20170426-075707609", "issn": "0002-7863", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20170426-075707609", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "funders": { "items": [ { "agency": "Caltech" } ] }, "doi": "10.1021/ja0363720", "primary_object": { "basename": "ja0363720si20030824_013459.pdf", "url": "https://authors.library.caltech.edu/records/vvmfb-77446/files/ja0363720si20030824_013459.pdf" }, "resource_type": "article", "pub_year": "2003", "author_list": "Jung, Hyungil; Kulkarni, Rajan; et el." }, { "id": "https://authors.library.caltech.eduhttps://authors.library.caltech.edu/records/j2256-grp46", "eprint_id": 95540, "eprint_status": "archive", "datestamp": "2023-08-19 09:40:49", "lastmod": "2023-10-20 20:19:43", "type": "article", "metadata_visibility": "show", "creators": { "items": [ { "id": "Luo-Yi", "name": { "family": "Luo", "given": "Yi" } }, { "id": "Collier-C-P", "name": { "family": "Collier", "given": "C. Patrick" } }, { "id": "Jeppesen-J-O", "name": { "family": "Jeppesen", "given": "Jan O." } }, { "id": "Nielsen-K-A", "name": { "family": "Nielsen", "given": "Kent A." } }, { "id": "DeIonno-E", "name": { "family": "DeIonno", "given": "Erica" } }, { "id": "Ho-Greg", "name": { "family": "Ho", "given": "Greg" } }, { "id": "Perkins-J", "name": { "family": "Perkins", "given": "Julie" } }, { "id": "Tseng-Hsian-Rong", "name": { "family": "Tseng", "given": "Hsian-Rong" } }, { "id": "Yamamoto-Tohru", "name": { "family": "Yamamoto", "given": "Tohru" } }, { "id": "Stoddart-J-F", "name": { "family": "Stoddart", "given": "J. Fraser" }, "orcid": "0000-0003-3161-3697" }, { "id": "Heath-J-R", "name": { "family": "Heath", "given": "James R." }, "orcid": "0000-0001-5356-4385" } ] }, "title": "Two-Dimensional Molecular Electronics Circuits", "ispublished": "pub", "full_text_status": "public", "note": "\u00a9 2002 Wiley\u2010VCH Verlag GmbH, Weinheim, Fed. Rep. of Germany. \n\nReceived: April 11, 2002. \n\nThis work was supported primarily by the Defense Advanced Research Projects Agency (DARPA) with partial support from the Semiconductor Research Corporation (SRC). Some of the molecular characterization work was supported by the National Science Foundation. C.P.C. was an employee of the Hewlett\u2013Packard Corporation. J.O.J. thanks the University of Odense for a PhD Scholarship. T.Y. thanks Showa Denko K K for a Visiting Scholar Fellowship. We would like to acknowledge assistance from the UCLA Nanolab and the UCSB fabrication facility.\n\nSupplemental Material - f401_s.pdf
", "abstract": "Addressing an array of bistable [2]rotaxanes through a two\u2010dimensional crossbar arrangement provides the device element of a current\u2010driven molecular electronic circuit. The development of the [2]rotaxane switches through an iterative, evolutionary process is described. The arrangement reported here allows both memory and logic functions to use the same elements.", "date": "2002-06-17", "date_type": "published", "publication": "ChemPhysChem", "volume": "3", "number": "6", "publisher": "Wiley", "pagerange": "519-525", "id_number": "CaltechAUTHORS:20190516-102504910", "issn": "1439-4235", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20190516-102504910", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "funders": { "items": [ { "agency": "Defense Advanced Research Projects Agency (DARPA)" }, { "agency": "Semiconductor Research Corporation" }, { "agency": "NSF" }, { "agency": "University of Odense" } ] }, "doi": "10.1002/1439-7641(20020617)3:6<519::aid-cphc519>3.0.co;2-2", "primary_object": { "basename": "f401_s.pdf", "url": "https://authors.library.caltech.edu/records/j2256-grp46/files/f401_s.pdf" }, "resource_type": "article", "pub_year": "2002", "author_list": "Luo, Yi; Collier, C. Patrick; et el." }, { "id": "https://authors.library.caltech.eduhttps://authors.library.caltech.edu/records/606yg-x8j83", "eprint_id": 95538, "eprint_status": "archive", "datestamp": "2023-08-21 23:20:23", "lastmod": "2023-10-20 20:19:38", "type": "article", "metadata_visibility": "show", "creators": { "items": [ { "id": "Collier-C-P", "name": { "family": "Collier", "given": "Charles P." } }, { "id": "Ma-Bin", "name": { "family": "Ma", "given": "Bin" } }, { "id": "Wong-Eric-W", "name": { "family": "Wong", "given": "Eric W." } }, { "id": "Heath-J-R", "name": { "family": "Heath", "given": "James R." }, "orcid": "0000-0001-5356-4385" }, { "id": "Wudl-F", "name": { "family": "Wudl", "given": "Fred" } } ] }, "title": "Photochemical Response of Electronically Reconfigurable Molecule-Based Switching Tunnel Junctions", "ispublished": "pub", "full_text_status": "public", "keywords": "Langmuir\u2013Blodgett films; molecular devices; photochemistry; spiropyrans; tunnel junctions", "note": "\u00a9 2002 Wiley\u2010VCH Verlag GmbH, Weinheim, Fed. Rep. of Germany. \n\nReceived: July 2, 2001; Revised: January 4, 2002. \n\nThis work was supported by the Defense Advanced Research Projects Agency, the Semiconductor Research Corporation, and the Office of Naval Research. We would like to acknowledge the support of the UCLA Nanoelectronics Research Facility staff in device fabrication.\n\nSupplemental Material - z256_s.pdf
", "abstract": "Robust molecular devices may be based on the photo\u2010switching between spiropyran and merocyanine isomers (see Scheme). The equilibrium has been investigated in a Langmuir\u2013Blodgett film and then succesfully sandwiched into a solid\u2010state tunnel junction.", "date": "2002-05-17", "date_type": "published", "publication": "ChemPhysChem", "volume": "3", "number": "5", "publisher": "Wiley", "pagerange": "458-461", "id_number": "CaltechAUTHORS:20190516-100847454", "issn": "1439-4235", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20190516-100847454", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "funders": { "items": [ { "agency": "Defense Advanced Research Projects Agency (DARPA)" }, { "agency": "Semiconductor Research Corporation" }, { "agency": "Office of Naval Research (ONR)" } ] }, "doi": "10.1002/1439-7641(20020517)3:5<458::aid-cphc458>3.0.co;2-x", "primary_object": { "basename": "z256_s.pdf", "url": "https://authors.library.caltech.edu/records/606yg-x8j83/files/z256_s.pdf" }, "resource_type": "article", "pub_year": "2002", "author_list": "Collier, Charles P.; Ma, Bin; et el." }, { "id": "https://authors.library.caltech.eduhttps://authors.library.caltech.edu/records/1m43n-th783", "eprint_id": 78313, "eprint_status": "archive", "datestamp": "2023-08-19 09:07:31", "lastmod": "2023-10-25 23:59:57", "type": "article", "metadata_visibility": "show", "creators": { "items": [ { "id": "Chi-H", "name": { "family": "Choi", "given": "H." } }, { "id": "Yang-X", "name": { "family": "Yang", "given": "X." } }, { "id": "Mitchell-G-W", "name": { "family": "Mitchell", "given": "G. W." } }, { "id": "Collier-C-P", "name": { "family": "Collier", "given": "C. P." } }, { "id": "Wudl-F", "name": { "family": "Wudl", "given": "F." } }, { "id": "Heath-J-R", "name": { "family": "Heath", "given": "J. R." }, "orcid": "0000-0001-5356-4385" } ] }, "title": "The Structure of a Tetraazapentacene Molecular Monolayer", "ispublished": "pub", "full_text_status": "restricted", "note": "\u00a9 2002 American Chemical Society. \n\nReceived 13 September 2001. Published online 1 February 2002. Published in print 1 February 2002. \n\nWe acknowledge the W.M. Keck Foundation, the National Science Foundation, and the Semiconductor Research Corporation for support, and Rigo Pantoja for helpful discussions. C.P.C. is an employee of the Hewlett-Packard Corporation, and he acknowledges support from DARPA.", "abstract": "Langmuir molecular monolayers of a unique tetraazapentacene zwitterionic amphiphile were found to form stripe-like domains that responded strongly to an applied magnetic field. These stripe domains were transferred as Langmuir\u2212Blodgett (LB) films to glass substrates, where they were structurally characterized using five complementary imaging techniques, including scanning second-harmonic generation (SHG) microscopy and capacitance force microscopy. The molecular orientations of adjacent single striped domains of a tetraazapentacene monolayer were determined by SHG polarization measurements. Those structures were shown to be consistent across the various imaging techniques.", "date": "2002-02-28", "date_type": "published", "publication": "Journal of Physical Chemistry B", "volume": "106", "number": "8", "publisher": "American Chemical Society", "pagerange": "1833-1839", "id_number": "CaltechAUTHORS:20170619-072243967", "issn": "1520-6106", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20170619-072243967", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "funders": { "items": [ { "agency": "W. M. Keck Foundation" }, { "agency": "NSF" }, { "agency": "Semiconductor Research Corporation" }, { "agency": "Defense Advanced Research Projects Agency (DARPA)" } ] }, "doi": "10.1021/jp0155415", "resource_type": "article", "pub_year": "2002", "author_list": "Choi, H.; Yang, X.; et el." }, { "id": "https://authors.library.caltech.eduhttps://authors.library.caltech.edu/records/wyhmz-mvn72", "eprint_id": 85057, "eprint_status": "archive", "datestamp": "2023-08-19 08:42:34", "lastmod": "2023-10-18 17:05:57", "type": "article", "metadata_visibility": "show", "creators": { "items": [ { "id": "Collier-C-P", "name": { "family": "Collier", "given": "C. Patrick" } }, { "id": "Jeppesen-J-O", "name": { "family": "Jeppesen", "given": "Jan O." } }, { "id": "Luo-Yi", "name": { "family": "Luo", "given": "Yi" } }, { "id": "Perkins-J", "name": { "family": "Perkins", "given": "Julie" } }, { "id": "Wong-Eric-W", "name": { "family": "Wong", "given": "Eric W." } }, { "id": "Heath-J-R", "name": { "family": "Heath", "given": "James R." }, "orcid": "0000-0001-5356-4385" }, { "id": "Stoddart-J-F", "name": { "family": "Stoddart", "given": "J. Fraser" }, "orcid": "0000-0003-3161-3697" } ] }, "title": "Molecular-Based Electronically Switchable Tunnel Junction Devices", "ispublished": "pub", "full_text_status": "public", "note": "\u00a9 2001 American Chemical Society. ACS Editors' Choice - Sponsored Access by American Chemical Society. \n\nReceived 12 June 2001. Published online 22 November 2001. Published in print 19 December 2001. \n\nThis work was funded by the Defense Advanced Research Projects Agency, the Semiconductor Research Corporation, and the Office of Naval Research. C.P.C. is an employee of the Hewlett-Packard Corporation, and the NMR spectrometer used in this work was supported by the National Science Foundation. We thank the University of Odense for a Ph.D. Scholarship to J.O.J.\n\nPublished - ja0114456.pdf
Supplemental Material - ja0114456_s.pdf
", "abstract": "Solid-state tunnel junction devices were fabricated from Langmuir Blodgett molecular monolayers of a bistable [2]catenane, a bistable [2]pseudorotaxane, and a single-station [2]rotaxane. All devices exhibited a (noncapacitive) hysteretic current\u2212voltage response that switched the device between high- and low-conductivity states, although control devices exhibited no such response. Correlations between the structure and solution-phase dynamics of the molecular and supramolecular systems, the crystallographic domain structure of the monolayer film, and the room-temperature device performance characteristics are reported.", "date": "2001-12-19", "date_type": "published", "publication": "Journal of the American Chemical Society", "volume": "123", "number": "50", "publisher": "American Chemical Society", "pagerange": "12632-12641", "id_number": "CaltechAUTHORS:20180302-082756149", "issn": "0002-7863", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20180302-082756149", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "funders": { "items": [ { "agency": "Defense Advanced Research Projects Agency (DARPA)" }, { "agency": "Semiconductor Research Corporation" }, { "agency": "Office of Naval Research (ONR)" }, { "agency": "Hewlett-Packard Corporation" }, { "agency": "NSF" } ] }, "doi": "10.1021/ja0114456", "primary_object": { "basename": "ja0114456.pdf", "url": "https://authors.library.caltech.edu/records/wyhmz-mvn72/files/ja0114456.pdf" }, "related_objects": [ { "basename": "ja0114456_s.pdf", "url": "https://authors.library.caltech.edu/records/wyhmz-mvn72/files/ja0114456_s.pdf" } ], "resource_type": "article", "pub_year": "2001", "author_list": "Collier, C. Patrick; Jeppesen, Jan O.; et el." }, { "id": "https://authors.library.caltech.eduhttps://authors.library.caltech.edu/records/f3kfn-btm40", "eprint_id": 85052, "eprint_status": "archive", "datestamp": "2023-08-19 07:51:17", "lastmod": "2023-10-18 17:05:32", "type": "article", "metadata_visibility": "show", "creators": { "items": [ { "id": "Pease-A-R", "name": { "family": "Pease", "given": "Anthony R." } }, { "id": "Jeppesen-J-O", "name": { "family": "Jeppesen", "given": "Jan O." } }, { "id": "Stoddart-J-F", "name": { "family": "Stoddart", "given": "J. Fraser" }, "orcid": "0000-0003-3161-3697" }, { "id": "Luo-Yi", "name": { "family": "Luo", "given": "Yi" } }, { "id": "Collier-C-P", "name": { "family": "Collier", "given": "C. Patrick" } }, { "id": "Heath-J-R", "name": { "family": "Heath", "given": "James R." }, "orcid": "0000-0001-5356-4385" } ] }, "title": "Switching Devices Based on Interlocked Molecules", "ispublished": "pub", "full_text_status": "restricted", "note": "\u00a9 2001 American Chemical Society. \n\nReceived 12 December 2000. Published online 7 April 2001. Published in print 1 June 2001. \n\nWe are indebted to Professors Vincenzo Balzani (Bologna) and David Williams (London) for long-standing, highly rewarding collaborations that have helped make the research described in this Account possible. This work was supported by the Defense Advanced Research Projects Agency, the Semiconductor Research Corporation, and the National Science Foundation.", "abstract": "An architectural rationale and an experimental program aimed at the development of molecular electronics switching devices for memory and computing applications are discussed. Two-terminal molecular switch tunnel junctions are identified as the critical device components of molecular electronics-based circuitry. They can be tiled in two dimensions and are tolerant of manufacturing defects. Singly and multiply configurable solid-state switching devices that are based upon electrochemically switchable molecular and supramolecular systems are discussed in terms of both the synthesis of the molecular components and the fabrication and performance of the devices.", "date": "2001-06", "date_type": "published", "publication": "Accounts of Chemical Research", "volume": "34", "number": "6", "publisher": "American Chemical Society", "pagerange": "433-444", "id_number": "CaltechAUTHORS:20180302-073433919", "issn": "0001-4842", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20180302-073433919", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "funders": { "items": [ { "agency": "Defense Advanced Research Projects Agency (DARPA)" }, { "agency": "Semiconductor Research Corporation" }, { "agency": "NSF" } ] }, "doi": "10.1021/ar000178q", "resource_type": "article", "pub_year": "2001", "author_list": "Pease, Anthony R.; Jeppesen, Jan O.; et el." }, { "id": "https://authors.library.caltech.eduhttps://authors.library.caltech.edu/records/3aaxa-qf230", "eprint_id": 95452, "eprint_status": "archive", "datestamp": "2023-08-19 06:12:47", "lastmod": "2023-10-20 20:15:00", "type": "article", "metadata_visibility": "show", "creators": { "items": [ { "id": "Collier-C-P", "name": { "family": "Collier", "given": "Charles P." } }, { "id": "Mattersteig-G", "name": { "family": "Mattersteig", "given": "Gunter" } }, { "id": "Wong-Eric-W", "name": { "family": "Wong", "given": "Eric W." } }, { "id": "Luo-Yi", "name": { "family": "Luo", "given": "Yi" } }, { "id": "Beverly-K-C", "name": { "family": "Beverly", "given": "Kristen" } }, { "id": "Sampaio-J", "name": { "family": "Sampaio", "given": "Jos\u00e9" } }, { "id": "Raymo-F-M", "name": { "family": "Raymo", "given": "Fran\u00e7isco M." } }, { "id": "Stoddart-J-F", "name": { "family": "Stoddart", "given": "J. Fraser" }, "orcid": "0000-0003-3161-3697" }, { "id": "Heath-J-R", "name": { "family": "Heath", "given": "James R." }, "orcid": "0000-0001-5356-4385" } ] }, "title": "A [2]Catenane-Based Solid State Electronically Reconfigurable Switch", "ispublished": "pub", "full_text_status": "restricted", "note": "\u00a9 2000 American Association for the Advancement of Science. \n\nReceived 16 February 2000; accepted 30 June 2000. \n\nThis research was supported by the Defense Advanced Research Projects Agency and by the NSF. C.P.C. is an employee of the Hewlett-Packard Company. We acknowledge T. Kamins (Hewlett-Packard) for useful advice in preparing the poly-Si electrodes and the staff at the University of California at Los Angeles (UCLA) Nanoelectronics Research Facility for helpful advice in device fabrication. A. Pease (UCLA) designed the artwork used in Fig. 1.", "abstract": "A solid state, electronically addressable, bistable [2]catenane-based molecular switching device was fabricated from a single monolayer of the [2]catenane, anchored with phospholipid counterions, and sandwiched between an n-type polycrystalline silicon bottom electrode and a metallic top electrode. The device exhibits hysteretic (bistable) current/voltage characteristics. The switch is opened at +2 volts, closed at \u22122 volts, and read at \u223c0.1 volt and may be recycled many times under ambient conditions. A mechanochemical mechanism for the action of the switch is presented and shown to be consistent with temperature-dependent measurements of the device operation.", "date": "2000-08-18", "date_type": "published", "publication": "Science", "volume": "289", "number": "5482", "publisher": "American Association for the Advancement of Science", "pagerange": "1172-1175", "id_number": "CaltechAUTHORS:20190513-152218119", "issn": "0036-8075", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20190513-152218119", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "funders": { "items": [ { "agency": "Defense Advanced Research Projects Agency (DARPA)" }, { "agency": "NSF" } ] }, "doi": "10.1126/science.289.5482.1172", "resource_type": "article", "pub_year": "2000", "author_list": "Collier, Charles P.; Mattersteig, Gunter; et el." }, { "id": "https://authors.library.caltech.eduhttps://authors.library.caltech.edu/records/4hmqm-pg053", "eprint_id": 85055, "eprint_status": "archive", "datestamp": "2023-08-19 05:57:22", "lastmod": "2023-10-18 17:05:45", "type": "article", "metadata_visibility": "show", "creators": { "items": [ { "id": "Wong-Eric-W", "name": { "family": "Wong", "given": "Eric W." } }, { "id": "Collier-C-P", "name": { "family": "Collier", "given": "Charles P." } }, { "id": "B\u011bhloradsk\u00fd-M", "name": { "family": "B\u011bhloradsk\u00fd", "given": "Martin" } }, { "id": "Raymo-F-M", "name": { "family": "Raymo", "given": "Fran\u00e7isco M." } }, { "id": "Stoddart-J-F", "name": { "family": "Stoddart", "given": "J. Fraser" }, "orcid": "0000-0003-3161-3697" }, { "id": "Heath-J-R", "name": { "family": "Heath", "given": "James R." }, "orcid": "0000-0001-5356-4385" } ] }, "title": "Fabrication and Transport Properties of Single-Molecule-Thick Electrochemical Junctions", "ispublished": "pub", "full_text_status": "restricted", "note": "\u00a9 2000 American Chemical Society. \n\nReceived 2 November 1999. Published online 31 May 2000. \n\nThis research was supported by the North Atlantic Treaty Organization (Collaborative Research Grant No. 960659), the National Science Foundation, and the Defense Advanced Research Projects Agency. We acknowledge helpful discussions with Dr. Stan Williams and Dr. Sang-Ho Kim.", "abstract": "A V-shaped compound incorporating two bipyridinium units, which emanate from a central hydrophilic core and bear hydrophobic tetraarylmethane-based stoppers at each end, was designed and synthesized. In a thermodynamically controlled self-assembly process in solution, either one or two 1,4-dioxybenzene-based macrocyclic polyethers can be slipped over the bulky stoppers of the V-shaped compound, affording either a [2]rotaxane or a [3]rotaxane, respectively. The parent V-shaped compound and the two rotaxanes incorporate two redox-active bipyridinium units that can be reduced reversibly and two redox-active phenoxy groups in the stoppers that can be oxidized irreversibly. Furthermore, these three compounds have amphiphilic character and, as a result, form stable monolayers at the air/water interface. Langmuir\u2212Blodgett monolayers of these compounds were sandwiched between two electrodes to afford molecule-based solid-state switches. In forward bias mode, the I\u2212V characteristics of the junction are reversible, but upon application of a sufficient reverse bias the junction resistance is irreversibly decreased, thereby switching the device. As a result, the current flowing through the device at forward bias voltages is lowered by a factor of 60\u221280. The behavior of the solid-state devices can be interpreted on the basis of the redox properties determined in solution for the three compounds. Initially, current flow at forward bias is determined by resonant tunneling through the molecular LUMO states associated with the bipyridium units. The irreversible decrease in current that occurs at reverse biases suggests a similarity to the solution-phase oxidation of the phenoxy groups.", "date": "2000-06-21", "date_type": "published", "publication": "Journal of the American Chemical Society", "volume": "122", "number": "24", "publisher": "American Chemical Society", "pagerange": "5831-5840", "id_number": "CaltechAUTHORS:20180302-081722324", "issn": "0002-7863", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20180302-081722324", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "funders": { "items": [ { "agency": "North Atlantic Treaty Organization (NATO)", "grant_number": "960659" }, { "agency": "NSF" }, { "agency": "Defense Advanced Research Projects Agency (DARPA)" } ] }, "doi": "10.1021/ja993890v", "resource_type": "article", "pub_year": "2000", "author_list": "Wong, Eric W.; Collier, Charles P.; et el." }, { "id": "https://authors.library.caltech.eduhttps://authors.library.caltech.edu/records/gjrk8-t1r33", "eprint_id": 85061, "eprint_status": "archive", "datestamp": "2023-08-19 04:21:12", "lastmod": "2023-10-18 17:06:15", "type": "article", "metadata_visibility": "show", "creators": { "items": [ { "id": "Henrichs-S-E", "name": { "family": "Henrichs", "given": "Sven E." } }, { "id": "Sample-J-L", "name": { "family": "Sample", "given": "Jennifer L." } }, { "id": "Shiang-Joe-J", "name": { "family": "Shiang", "given": "Joe J." } }, { "id": "Heath-J-R", "name": { "family": "Heath", "given": "James R." }, "orcid": "0000-0001-5356-4385" }, { "id": "Collier-C-P", "name": { "family": "Collier", "given": "Charles P." } }, { "id": "Saykally-R-J", "name": { "family": "Saykally", "given": "Richard J." } } ] }, "title": "Positive and Negative Contrast Lithography on Silver Quantum Dot Monolayers", "ispublished": "pub", "full_text_status": "restricted", "note": "\u00a9 1999 American Chemical Society. \n\nReceived 6 January 1999. Published online 21 April 1999. Published in print 1 May 1999. \n\nS.E.H., J.L.S., J.J.S., and J.R.H. acknowledge support from an NSF-GOALI grant. J.R.H. acknowledges support from the Alfred P. Sloan Foundation and from the Packard Foundation. C.P.C. and R.J.S. acknowledge support from the NSF. We would like to acknowledge Stan Williams for initially suggesting the possibility of an ionization process in the write step for large particle monolayers.", "abstract": "Scanning nonlinear optical microscopy, at a resolution of \u223c2 \u03bcm, was utilized to examine monolayers of alkylthiol-passivated silver nanocrystals. Selected regions of the monolayers were irradiated with a pulse train of picosecond 1064 nm laser pulses, and then the second harmonic generation (SHG) response of those monolayers was recorded in a second scan. Two lithographic processesone leading to a negative contrast SHG image (observed for particles <4 nm diameter) and a second leading to a positive contrast SH G image (observed for larger particles)were found. These processes are explained within the context of literature models that account for particle size dependent energy partitioning.", "date": "1999-05-06", "date_type": "published", "publication": "Journal of Physical Chemistry B", "volume": "103", "number": "18", "publisher": "American Chemical Society", "pagerange": "3524-3528", "id_number": "CaltechAUTHORS:20180302-093117451", "issn": "1520-6106", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20180302-093117451", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "funders": { "items": [ { "agency": "NSF" }, { "agency": "Alfred P. Sloan Foundation" }, { "agency": "David and Lucile Packard Foundation" } ] }, "doi": "10.1021/jp990080x", "resource_type": "article", "pub_year": "1999", "author_list": "Henrichs, Sven E.; Sample, Jennifer L.; et el." }, { "id": "https://authors.library.caltech.eduhttps://authors.library.caltech.edu/records/80j62-dnb98", "eprint_id": 85054, "eprint_status": "archive", "datestamp": "2023-08-19 04:19:28", "lastmod": "2023-10-18 17:05:43", "type": "article", "metadata_visibility": "show", "creators": { "items": [ { "id": "Markovich-G", "name": { "family": "Markovich", "given": "Gil" } }, { "id": "Collier-C-P", "name": { "family": "Collier", "given": "C. Patrick" } }, { "id": "Henrichs-S-E", "name": { "family": "Henrichs", "given": "Sven E." } }, { "id": "Remacle-F", "name": { "family": "Remacle", "given": "Fran\u00e7oise" } }, { "id": "Levine-R-D", "name": { "family": "Levine", "given": "Raphael D." } }, { "id": "Heath-J-R", "name": { "family": "Heath", "given": "James R." }, "orcid": "0000-0001-5356-4385" } ] }, "title": "Architectonic Quantum Dot Solids", "ispublished": "pub", "full_text_status": "restricted", "note": "\u00a9 1999 American Chemical Society. \n\nReceived 4 May 1998. Published online 8 January 1999. Published in print 1 May 1999. \n\nWe acknowledge R. Saykally, C. Knobler, W. Gelbart, R. Shen, J. Shiang, S. Williams, G. Madeiros-Ribeiro, and D. Ohldberg. J.R.H. acknowledges support from the ONR, the NSF, a Packard Fellowship, and a Sloan Fellowship.", "abstract": "Three things largely determine the electronic properties of a crystal:\u2009 the energy levels of the atoms or lattice sites, the coupling between adjacent sites, and the symmetry of the solid. Imagine being able to control each of these properties separately, and therefore being able to \"design\" a solid with a prescribed set of electronic properties. For an atomic solid, this would amount to being able to tune the electronegativity of an atom, to control the strength of the covalent interactions within the lattice, and to choose the crystal structure. While the chemistry of the periodic table does not permit such control, the chemistry of \"artificial atoms\",1 or quantum dots (QDs), does. In this Account, we will discuss one example of \"designing\" a unique electronic property into a QD solid. This property, which is the ability of the solid to reversibly pass through a metal\u2212insulator (MI) transition under ambient conditions, is something that has not been previously demonstrated for a more traditional solid. A two-dimensional (2D) hexagonal superlattice of organically passivated silver QDs was fabricated as a Langmuir monolayer. Selecting a particular size of QD controlled the (super)lattice site energies. The coupling between adjacent QDs was coarsely controlled by selection of the organic surface passivant, and precisely controlled by compressing the superlattice using the Langmuir technique. By using the title \"Architectonic2 Quantum Dot Solids\", we emphasize that many of the collective properties of the superlattice were rationally designed into the material.", "date": "1999-05", "date_type": "published", "publication": "Accounts of Chemical Research", "volume": "32", "number": "5", "publisher": "American Chemical Society", "pagerange": "415-423", "id_number": "CaltechAUTHORS:20180302-080943418", "issn": "0001-4842", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20180302-080943418", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "funders": { "items": [ { "agency": "Office of Naval Research (ONR)" }, { "agency": "NSF" }, { "agency": "David and Lucile Packard Foundation" }, { "agency": "Alfred P. Sloan Foundation" } ] }, "doi": "10.1021/ar980039x", "resource_type": "article", "pub_year": "1999", "author_list": "Markovich, Gil; Collier, C. Patrick; et el." }, { "id": "https://authors.library.caltech.eduhttps://authors.library.caltech.edu/records/0a2w8-sgp89", "eprint_id": 95448, "eprint_status": "archive", "datestamp": "2023-08-22 13:11:28", "lastmod": "2023-10-20 20:14:41", "type": "article", "metadata_visibility": "show", "creators": { "items": [ { "id": "Collier-C-P", "name": { "family": "Collier", "given": "C. P." } }, { "id": "Vossmeyer-T", "name": { "family": "Vossmeyer", "given": "T." } }, { "id": "Heath-J-R", "name": { "family": "Heath", "given": "J. R." }, "orcid": "0000-0001-5356-4385" } ] }, "title": "Nanocrystal Superlattices", "ispublished": "pub", "full_text_status": "restricted", "keywords": "ordered arrays; quantum dots; semiconductors; artificial solids", "note": "\u00a9 1998 Annual Reviews.", "abstract": "Ordered arrays, or superlattices, of metallic, insulating, or semiconducting quantum dots, represent an exciting new class of materials. These superlattices are often referred to as artificial solids, in which the nanocrystals take the place of atoms in traditional solids, and the packing arrangement of the nanocrystals determines the unit cell parameters of the superstructure. In this review, we discuss various approaches toward assembling nanocrystal superlattices and we discuss their physical properties.", "date": "1998-10", "date_type": "published", "publication": "Annual Review of Physical Chemistry", "volume": "49", "publisher": "Annual Reviews", "pagerange": "371-404", "id_number": "CaltechAUTHORS:20190513-144234145", "issn": "0066-426X", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20190513-144234145", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "doi": "10.1146/annurev.physchem.49.1.371", "resource_type": "article", "pub_year": "1998", "author_list": "Collier, C. P.; Vossmeyer, T.; et el." }, { "id": "https://authors.library.caltech.eduhttps://authors.library.caltech.edu/records/xz3ea-1f376", "eprint_id": 5362, "eprint_status": "archive", "datestamp": "2023-08-22 12:46:51", "lastmod": "2023-10-16 19:10:47", "type": "article", "metadata_visibility": "show", "creators": { "items": [ { "id": "Markovich-G", "name": { "family": "Markovich", "given": "Gil" } }, { "id": "Collier-C-P", "name": { "family": "Collier", "given": "Charles P." } }, { "id": "Heath-J-R", "name": { "family": "Heath", "given": "James R." }, "orcid": "0000-0001-5356-4385" } ] }, "title": "Reversible Metal-Insulator Transition in Ordered Metal Nanocrystal Monolayers Observed by Impedance Spectroscopy", "ispublished": "pub", "full_text_status": "public", "note": "\u00a9 1998 The American Physical Society. \n\nReceived 3 November 1997. \n\nWe thank R.S. Williams and Hewlett Packard Corporation for loan of the LCR meter used in these experiments. We acknowledge helpful discussions with Steve Kivelson, Rich Saykally, and Alex Bratkovski. J.R.H. and G.M. acknowledge support from an NSF-NYI grant. C.P.C. acknowledges support from NSF Grant No. CHE-9424482.\n\nPublished - MARprl98b.pdf
", "abstract": "Low frequency impedance spectroscopy was applied on a Langmuir monolayer of alkylthiol passivated 35 \u00c5 diameter silver quantum dots, as a function of interparticle separation distance. As interparticle spacing decreases below 30% of particle diameter, a reduction in interparticle charge tunneling time is observed. On further compression, the complex impedance of the films undergoes a transition from a parallel RC equivalent circuit to an inductive circuit. Optical reflectance changes in the films are consistent with the deduced metal-insulator transition.", "date": "1998-04-27", "date_type": "published", "publication": "Physical Review Letters", "volume": "80", "number": "17", "publisher": "American Physical Society", "pagerange": "3807-3810", "id_number": "CaltechAUTHORS:MARprl98b", "issn": "0031-9007", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:MARprl98b", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "funders": { "items": [ { "agency": "NSF", "grant_number": "CHE-9424482" } ] }, "doi": "10.1103/PhysRevLett.80.3807", "primary_object": { "basename": "MARprl98b.pdf", "url": "https://authors.library.caltech.edu/records/xz3ea-1f376/files/MARprl98b.pdf" }, "resource_type": "article", "pub_year": "1998", "author_list": "Markovich, Gil; Collier, Charles P.; et el." }, { "id": "https://authors.library.caltech.eduhttps://authors.library.caltech.edu/records/a8fzx-nw561", "eprint_id": 28818, "eprint_status": "archive", "datestamp": "2023-08-19 02:43:49", "lastmod": "2023-10-24 18:10:26", "type": "article", "metadata_visibility": "show", "creators": { "items": [ { "id": "Boldyrev-A-I", "name": { "family": "Boldyrev", "given": "Alexander I." } }, { "id": "Simons-J", "name": { "family": "Simons", "given": "Jack" } }, { "id": "Scherer-J-J", "name": { "family": "Scherer", "given": "J. J." } }, { "id": "Paul-J-B", "name": { "family": "Paul", "given": "J. B." } }, { "id": "Collier-C-P", "name": { "family": "Collier", "given": "C. P." } }, { "id": "Saykally-R-J", "name": { "family": "Saykally", "given": "R. J." } } ] }, "title": "On the ground electronic states of copper silicide and its ions", "ispublished": "pub", "full_text_status": "public", "keywords": "silicon compounds, copper compounds, bond lengths, ground states, negative ions, positive ions, ab initio calculations", "note": "\u00a9 1998 American Institute of Physics. Received 3 April 1997; accepted 7 January 1998. The authors wish to thank Professor Michael Morse and\nProfessor Richard Barrow for bringing to their attention the\npossibility that SiCu might have a 2P rather than 2S ground\nelectronic state. This theoretical work was supported by NSF\nGrant No. CHE9116286. The Saykally CRLAS studies were\nsupported by the AFORS Grant No. F49620-96-1-0411.\n\nPublished - BOLjcp98.pdf
", "abstract": "The low-lying electronic states of SiCu, SiCu^+, and SiCu^\u2212 have been studied using a variety of high-level ab initio techniques. As expected on the basis of simple orbital occupancy and bond forming for Si(s^2p^2)+Cu(s^1) species, ^2\u03a0_r, ^1\u03a3^+, and ^3\u03a3^\u2212 states were found to be the ground electronic states for SiCu, SiCu^+, and SiCu^\u2212, respectively; the ^2\u03a0_r state is not that suggested in most recent experimental studies. All of these molecules were found to be quite strongly bound although the bond lengths, bond energies, and harmonic frequencies vary slightly among them, as a result of the nonbonding character of the 2\u03c0-MO (molecular orbital) [composed almost entirely of the Si 3p-AO (atomic orbital)], the occupation of which varies from 0 to 2 within the ^1\u03a3^+, ^2\u03a0_r, and ^3\u03a3^\u2212 series. The neutral SiCu is found to have bound excited electronic states of ^4\u03a3^\u2212, ^2\u0394, ^2\u03a3^+, and ^2\u03a0_i symmetry lying 0.5, 1.2, 1.8, and 3.2 eV above the ^2\u03a0_r ground state. It is possible but not yet certain that the ^2\u03a0_i state is, in fact, the \"B state\" observed in the recent experimental studies by Scherer, Paul, Collier, and Saykally.", "date": "1998-04-08", "date_type": "published", "publication": "Journal of Chemical Physics", "volume": "108", "number": "14", "publisher": "American Institute of Physics", "pagerange": "5728-5732", "id_number": "CaltechAUTHORS:20120117-150914174", "issn": "0021-9606", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20120117-150914174", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "funders": { "items": [ { "agency": "NSF", "grant_number": "CHE9116286" }, { "agency": "AFORS", "grant_number": "F49620-96-1-0411" } ] }, "doi": "10.1063/1.475982", "primary_object": { "basename": "BOLjcp98.pdf", "url": "https://authors.library.caltech.edu/records/a8fzx-nw561/files/BOLjcp98.pdf" }, "resource_type": "article", "pub_year": "1998", "author_list": "Boldyrev, Alexander I.; Simons, Jack; et el." }, { "id": "https://authors.library.caltech.eduhttps://authors.library.caltech.edu/records/998xj-g7618", "eprint_id": 11412, "eprint_status": "archive", "datestamp": "2023-08-22 10:52:49", "lastmod": "2023-10-16 23:46:41", "type": "article", "metadata_visibility": "show", "creators": { "items": [ { "id": "Paul-J-B", "name": { "family": "Paul", "given": "J. B." } }, { "id": "Scherer-J-J", "name": { "family": "Scherer", "given": "J. J." } }, { "id": "Collier-C-P", "name": { "family": "Collier", "given": "C. P." } }, { "id": "Saykally-R-J", "name": { "family": "Saykally", "given": "R. J." } } ] }, "title": "Cavity ringdown laser absorption spectroscopy and time-of-flight mass spectroscopy of jet cooled platinum silicides", "ispublished": "pub", "full_text_status": "public", "keywords": "ABSORPTION SPECTROSCOPY, ELECTRONIC STRUCTURE, ENERGY\u2013LEVEL TRANSITIONS, LASER SPECTROSCOPY, MOLECULAR CLUSTERS, PLATINUM SILICIDES, ROTATIONAL STATES, TIME\u2013OF\u2013FLIGHT MASS SPECTROMETERS, GAS PHASE, VIBRONIC STATES", "note": "\u00a9 1996 American Institute of Physics. \n\nReceived 19 June 1995; accepted 15 November 1995. \n\nThis work was supported by the Air Force Office of Scientific Research (F49620-93-1-0278). Some equipment was provided by the National Science Foundation (CHE-9123335).\n\nPublished - PAUjcp96.pdf
", "abstract": "The cavity ringdown technique (CRLAS) has been employed to measure the gas phase absorption spectrum of the platinum silicide molecule in the 350 nm region. All nine of the measured rovibronic bands are assigned to a single 1\u2211\u20131\u2211 electronic transition, with a ground state vibrational frequency of \u03c9\"e=549.0(3) cm^\u20131, and a bond length of r\"0=2.069(1) \u00c5. The results of this study are compared with experimental data for the coinage metal silicides. Additionally, time-of-flight mass spectrometric results indicate that a variety of polyatomic metal silicides are formed in our molecular jet expansion.", "date": "1996-02-22", "date_type": "published", "publication": "Journal of Chemical Physics", "volume": "104", "number": "8", "publisher": "American Institute of Physics", "pagerange": "2782-2788", "id_number": "CaltechAUTHORS:PAUjcp96", "issn": "0021-9606", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:PAUjcp96", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "funders": { "items": [ { "agency": "Air Force Office of Scientific Research", "grant_number": "F49620-93-1-0278" }, { "agency": "National Science Foundation", "grant_number": "CHE-9123335" } ] }, "doi": "10.1063/1.471101", "primary_object": { "basename": "PAUjcp96.pdf", "url": "https://authors.library.caltech.edu/records/998xj-g7618/files/PAUjcp96.pdf" }, "resource_type": "article", "pub_year": "1996", "author_list": "Paul, J. B.; Scherer, J. J.; et el." }, { "id": "https://authors.library.caltech.eduhttps://authors.library.caltech.edu/records/ftnke-1v073", "eprint_id": 4113, "eprint_status": "archive", "datestamp": "2023-08-22 10:41:25", "lastmod": "2023-10-16 17:37:29", "type": "article", "metadata_visibility": "show", "creators": { "items": [ { "id": "Scherer-J-J", "name": { "family": "Scherer", "given": "J. J." } }, { "id": "Paul-J-B", "name": { "family": "Paul", "given": "J. B." } }, { "id": "Collier-C-P", "name": { "family": "Collier", "given": "C. P." } }, { "id": "O'Keefe-A", "name": { "family": "O'Keefe", "given": "A." } }, { "id": "Saykally-R-J", "name": { "family": "Saykally", "given": "R. J." } } ] }, "title": "Cavity ringdown laser absorption spectroscopy and time-of-flight mass spectroscopy of jet-cooled gold silicides", "ispublished": "pub", "full_text_status": "public", "keywords": "ABSORPTION SPECTROSCOPY; DIATOMIC MOLECULES; ELECTRONIC STRUCTURE; GOLD SILICIDES; MASS SPECTROSCOPY; MOLECULAR BEAMS; TIME\u2013OF\u2013FLIGHT METHOD; ULTRAVIOLET SPECTRA; VIBRONIC STATES", "note": "\u00a91995 American Institute of Physics \n\n(Received 8 May 1995; accepted 14 August 1995) \n\nThis research was supported by the Air Force Office of Scientific Research under Grant No. F49620-93-1-0278. J.J.S. thanks I.B.M. for a predoctoral fellowship during part of this research.", "abstract": "The cavity ringdown technique has been employed for the spectroscopic characterization of the AuSi molecule, which is generated in a pulsed supersonic laser vaporization plasma reactor. Fifteen rovibronic bands have been measured between 340 nm\u2013390 nm, 8 of which have been analyzed to yield molecular properties for the X and D 2Sigma states of AuSi. This assignment is in disagreement with previous emission studies of AuSi, which had assigned the ground electronic state as a 2Pi state. A time-of-flight mass spectrometer simultaneously monitors species produced in the molecular beam and has provided evidence for facile formation of polyatomic gold silicides. Comparison of AuSi with our recent results for CuSi and AgSi indicates regular bonding trends for the three coinage metal silicide diatoms.", "date": "1995-12-01", "date_type": "published", "publication": "Journal of Chemical Physics", "volume": "103", "number": "21", "publisher": "Journal of Chemical Physics", "pagerange": "9187-9192", "id_number": "CaltechAUTHORS:SCHEjcp95a", "issn": "0021-9606", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:SCHEjcp95a", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "doi": "10.1063/1.470029", "primary_object": { "basename": "SCHEjcp95a.pdf", "url": "https://authors.library.caltech.edu/records/ftnke-1v073/files/SCHEjcp95a.pdf" }, "resource_type": "article", "pub_year": "1995", "author_list": "Scherer, J. J.; Paul, J. B.; et el." }, { "id": "https://authors.library.caltech.eduhttps://authors.library.caltech.edu/records/e3dyy-edn73", "eprint_id": 4114, "eprint_status": "archive", "datestamp": "2023-08-22 10:31:09", "lastmod": "2023-10-16 17:37:31", "type": "article", "metadata_visibility": "show", "creators": { "items": [ { "id": "Scherer-J-J", "name": { "family": "Scherer", "given": "J. J." } }, { "id": "Paul-J-B", "name": { "family": "Paul", "given": "J. B." } }, { "id": "Collier-C-P", "name": { "family": "Collier", "given": "C. P." } }, { "id": "Saykally-R-J", "name": { "family": "Saykally", "given": "R. J." } } ] }, "title": "Cavity ringdown laser absorption spectroscopy and time-of-flight mass spectroscopy of jet-cooled silver silicides", "ispublished": "pub", "full_text_status": "public", "keywords": "LASER SPECTROSCOPY; ROTATIONAL STATES; VIBRATIONAL STATES; SILVER COMPOUNDS; TIME\u2013OF\u2013FLIGHT SPECTROMETERS; SILICIDES; COPPER SILICIDES; CHEMICAL BONDS", "note": "\u00a91995 American Institute of Physics. \n\n(Received 15 February 1995; accepted 27 March 1995) \n\nThis research was supported by the Air Force Office of Scientific Research under Grant No. F49620-93-1-0278. J.J.S. thanks I.B.M. for a predoctoral fellowship during part of this research.", "abstract": "The cavity ringdown technique has been employed for the first spectroscopic characterization of the AgSi molecule, which is generated in a pulsed laser vaporization plasma reactor. A total of 20 rovibronic bands between 365 and 385 nm have been measured and analyzed to yield molecular properties for the X, B, and C 2Sigma states of AgSi. A time-of-flight mass spectrometer simultaneously monitors species produced in the molecular beam and has provided the first direct evidence for the existence of polyatomic silver silicides. Comparison of the AgSi data to our recent results for the CuSi diatom reveals very similar chemical bonding in the two coinage metal silicides, apparently dominated by covalent interactions.", "date": "1995-07-01", "date_type": "published", "publication": "Journal of Chemical Physics", "volume": "103", "number": "1", "publisher": "Journal of Chemical Physics", "pagerange": "113-120", "id_number": "CaltechAUTHORS:SCHEjcp95b", "issn": "0021-9606", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:SCHEjcp95b", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "doi": "10.1063/1.469649", "primary_object": { "basename": "SCHEjcp95b.pdf", "url": "https://authors.library.caltech.edu/records/e3dyy-edn73/files/SCHEjcp95b.pdf" }, "resource_type": "article", "pub_year": "1995", "author_list": "Scherer, J. J.; Paul, J. B.; et el." }, { "id": "https://authors.library.caltech.eduhttps://authors.library.caltech.edu/records/035hp-hdb73", "eprint_id": 4112, "eprint_status": "archive", "datestamp": "2023-08-22 10:23:43", "lastmod": "2023-10-16 17:37:26", "type": "article", "metadata_visibility": "show", "creators": { "items": [ { "id": "Scherer-J-J", "name": { "family": "Scherer", "given": "J. J." } }, { "id": "Paul-J-B", "name": { "family": "Paul", "given": "J. B." } }, { "id": "Collier-C-P", "name": { "family": "Collier", "given": "C. P." } }, { "id": "Saykally-R-J", "name": { "family": "Saykally", "given": "R. J." } } ] }, "title": "Cavity ringdown laser absorption spectroscopy and time-of-flight mass spectroscopy of jet-cooled copper silicides", "ispublished": "pub", "full_text_status": "public", "keywords": "ABSORPTION SPECTRA; LASER SPECTROSCOPY; TIME\u2013OF\u2013FLIGHT METHOD; MASS SPECTROSCOPY; JETS; COOLING; COPPER SILICIDES; PLASMA; LASERS; EVAPORATION; ULTRAVIOLET RADIATION; PULSES; CORRECTIONS; ROTATIONAL STATES; VIBRONIC STATES; GROUND STATES; EXCITED STATES; ISOTOPE EFFECTS; CORRELATIONS; NICKEL SILICIDES; MOLECULAR CLUSTERS; CLUSTER EVOLUTION; ELECTRON SPECTRA", "note": "\u00a91995 American Institute of Physics. \n\n(Received 31 October 1994; accepted 20 December 1994) \n\nThis work was supported by the Air Force Office of Scientific Research (Grant No. F49620-93-1-0278). Equipment was provided by the National Science Foundation (Grant No. CHE-9123335). J. J. Scherer thanks IBM for a predoctoral fellowship awarded during part of this research work.", "abstract": "The cavity ringdown technique has been implemented for electronic spectroscopy of jet-cooled CuSi produced in a pulsed UV laser vaporization plasma reactor. A time-of-flight mass spectrometer is used to simultaneously monitor species produced in the supersonic expansion and allows correlation studies to be performed. Seven rotationally resolved vibronic bands have been measured near 400 nm, yielding spectroscopic constants for the 2Sigma ground and excited states. Vibronic isotope shifts, together with rotational line positions, permit the unambiguous determination of the spectral carrier and vibronic assignment. Since no ab initio studies for the CuSi molecule exist, a comparison to ab initio studies of the related NiSi molecule is presented. Time-of-flight mass spectrometric measurements indicate the facile formation of CuxSiy clusters containing multiple copper atoms, in contrast to earlier mass spectrometric work on transition metal silicides.", "date": "1995-04-01", "date_type": "published", "publication": "Journal of Chemical Physics", "volume": "102", "number": "13", "publisher": "Journal of Chemical Physics", "pagerange": "5190-5199", "id_number": "CaltechAUTHORS:SCHEjcp95c", "issn": "0021-9606", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:SCHEjcp95c", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "doi": "10.1063/1.469244", "primary_object": { "basename": "SCHEjcp95c.pdf", "url": "https://authors.library.caltech.edu/records/035hp-hdb73/files/SCHEjcp95c.pdf" }, "resource_type": "article", "pub_year": "1995", "author_list": "Scherer, J. J.; Paul, J. B.; et el." } ]