Prof. Nathan Saul Lewis Profile

Prof. Nathan Saul Lewis

Professor of Chemistry at Caltech

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Publications (11)

Proceedings Article | 25 August 2010 Paper

Photoelectrochemical water splitting: silicon photocathodes for hydrogen evolution

Emily Warren, Shannon Boettcher, James McKone, Nathan Lewis

Proceedings Volume 7770, 77701F (2010) https://doi.org/10.1117/12.860994

KEYWORDS: Silicon, Hydrogen, Semiconductors, Absorption, Nanoparticles, Electrodes, Platinum, Metals, Nickel, Solar energy

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Proceedings Article | 21 August 2009 Paper

Silicon and tungsten oxide nanostructures for water splitting

Karla Reyes Gil, Joshua Spurgeon, Nathan Lewis

Proceedings Volume 7408, 74080S (2009) https://doi.org/10.1117/12.825545

KEYWORDS: Solar energy, Hydrogen, Silicon, Semiconductors, Oxides, Water splitting, Tungsten, Oxygen, Semiconductor materials, Solar cells

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Proceedings Article | 8 April 2008 Paper

Extraction of spatiotemporal response information from sorption-based cross-reactive sensor arrays for the identification and quantification of analyte mixtures

Marc Woodka, Bruce Brunschwig, Nathan Lewis

Proceedings Volume 6932, 69321M (2008) https://doi.org/10.1117/12.781517

KEYWORDS: Sensors, Composites, Magnesium, Bioalcohols, Statistical analysis, Resistance, Analytical research, Chemical analysis, Electrodes, Error analysis

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Proceedings Article | 13 August 2002 Paper

Classification performance of carbon black-polymer composite vapor detector arrays as a function of array size and detector composition

Michael Burl, Brian Sisk, Thomas Vaid, Nathan Lewis

Proceedings Volume 4742, (2002) https://doi.org/10.1117/12.479125

KEYWORDS: Sensors, Detector arrays, Composites, Chemical analysis, Sensor performance, Polymers, Signal detection, Resistance, Carbon, Classification systems

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Proceedings Article | 24 June 2002 Paper

Detection and classification characteristics of arrays of carbon black/organic polymer composite chemiresistive vapor detectors for the nerve agent simulants Dimethylmethylphosphonate and Diisopropy

Alan Hopkins, Nathan Lewis

Proceedings Volume 4722, (2002) https://doi.org/10.1117/12.472252

KEYWORDS: Sensors, Carbon, Polymers, Composites, Magnesium, Nerve agents, Statistical analysis, Water, Resistance, Detector arrays

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Proceedings Article | 18 October 2001 Paper

Array-based carbon black-polymer composite vapor detectors for detection of DNT in environments containing complex analyte mixtures

Shawn Briglin, Michael Freund, Brian Sisk, Nathan Lewis

Proceedings Volume 4394, (2001) https://doi.org/10.1117/12.445419

KEYWORDS: Sensors, Polymers, Composites, Detector arrays, Carbon, Halogens, Facial recognition systems, Resistance, Chemical elements, Chemical analysis

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Proceedings Article | 22 August 2000 Paper

Progress in use of carbon-black-polymer composite vapor detector arrays for land mine detection

Shawn Briglin, Michael Burl, Michael Freund, Nathan Lewis, Adam Matzger, D. Nelson Ortiz, Phil Tokumaru

Proceedings Volume 4038, (2000) https://doi.org/10.1117/12.396281

KEYWORDS: Sensors, Resistance, Polymers, Composites, Detector arrays, Land mines, Carbon, Signal detection, Chemical elements, Statistical analysis

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Proceedings Article | 2 August 1999 Paper

Vapor sensing with arrays of carbon black-polymer composites

Adam Matzger, Thomas Vaid, Nathan Lewis

Proceedings Volume 3710, (1999) https://doi.org/10.1117/12.357053

KEYWORDS: Sensors, Polymers, Polymeric sensors, Composites, Polymer thin films, Carbon, Resistance, Chemical elements, Land mines, Bioalcohols

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Proceedings Article | 4 September 1998 Paper

Progress in the development of an electronic nose using arrays of chemically sensitive carbon black-polymer resistors

Brett Doleman, Erik Severin, Robert Sanner, Nathan Lewis

Proceedings Volume 3392, (1998) https://doi.org/10.1117/12.324211

KEYWORDS: Sensors, Nose, Carbon, Polymers, Composites, Detector arrays, Resistance, Signal detection, Spectral resolution, Bioalcohols

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Response data were collected for a carbon black-polymer composite electronic nose array during exposure to homologous series of alkanes and alcohols. At a fixed partial pressure of odorant in the vapor phase, the mean response intensity of the electronic nose signals varied significantly for members of each series of odorants. However, the mean response intensity of the electronic nose detectors, and the response intensity of the most strongly-driven set of electronic nose detectors, was essentially constant for members of a chemically homologous odorant series when the concentration of each odorant in the gas phase was maintained at a constant fraction of the odorant's vapor pressure. Because the thermodynamic activity of an odorant at equilibrium in a sorbent phase is equal to the partial pressure of the odorant in the gas phase divided by the vapor pressure of the odorant, and because the activity coefficients are similar within these homologous series of odorants for sorption of the vapors into specific polymer films, the data imply that the trends in detector response can be understood based on the thermodynamic tendency to establish a relatively constant concentration of sorbed odorant into each of the polymeric films of the electronic nose at a constant fraction of the odorant's vapor pressure. This phenomenon provides a natural mechanism for enhanced sensitivity to low vapor pressure compounds, like TNT, in the presence of high vapor pressure analytes, such as diesel fuel. In a related study to evaluate the target recognition properties of the electronic nose, a statistical metric based on the magnitudes and standard deviations along Euclidean projections of clustered array response data, was utilized to facilitate an evaluation of the performance of detector arrays in various vapor classification tasks. This approach allowed quantification of the ability of a fourteen-element array of carbon black-insulating polymer composite chemiresistors to distinguish between members of a set of nineteen solvent vapors, some of which vary widely in chemical properties (e.g. methanol and benzene) and others of which are very similar (e.g. n-pentane and n-heptane). The data also facilitated evaluation of questions such as array performance as a function of the number of detectors in the system.

Proceedings Article | 22 July 1997 Paper

Array-based vapor sensing using chemically sensitive carbon black-polymer resistors

Nathan Lewis, Mark Lonergan, Erik Severin, Brett Doleman, Robert Grubbs

Proceedings Volume 3079, (1997) https://doi.org/10.1117/12.280895

KEYWORDS: Sensors, Composites, Resistance, Chemical elements, Polymers, Carbon, Polymeric sensors, Capacitors, Biological and chemical sensing, Bioalcohols

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Proceedings Article | 1 March 1991 Paper

Soluble polyacetylenes derived from the ring-opening metathesis polymerization of substituted cyclooctatetraenes: electrochemical characterization and Schottky barrier devices

Thomas Jozefiak, Michael Sailor, Eric Ginsburg, Christopher Gorman, Nathan Lewis, Robert Grubbs

Proceedings Volume 1436, (1991) https://doi.org/10.1117/12.45109

KEYWORDS: Polymers, Diodes, Electrodes, Silicon, Doping, Semiconductors, Metals, Thin films, Interfaces, Polymerization

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Showing 5 of 11 publications

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