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Response and Discrimination Performance of Arrays of Organothiol-Capped Au Nanoparticle Chemiresistive Vapor Sensors

García-Berríos, Edgardo and Gao, Ting and Theriot, Jordan C. and Woodka, Marc D. and Brunschwig, Bruce S. and Lewis, Nathan S. (2011) Response and Discrimination Performance of Arrays of Organothiol-Capped Au Nanoparticle Chemiresistive Vapor Sensors. Journal of Physical Chemistry C, 115 (14). pp. 6208-6217. ISSN 1932-7447. doi:10.1021/jp110793h.

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The response and discrimination performance of an array that consisted of 20 different organothiol-capped Au nanoparticle chemiresistive vapor sensors was evaluated during exposure to 13 different organic vapors. The passivating organothiol ligand library consisted of collections of straight-chain alkanethiols, branched alkanethiols, and aromatic thiols. A fourth collection of sensors was formed from composites of 2-phenylethanethiol-capped Au nanoparticles and nonpolymeric aromatic materials that were coembedded in a sensor film. The organic vapors consisted of six hydrocarbons (n-hexane, n-heptane, n-octane, isooctane, cyclohexane, and toluene), three polar aprotic vapors (chloroform, tetrahydrofuran, and ethyl acetate), and four alcohols (methanol, ethanol, isopropanol, and 1-butanol). Trends in the resistance response of the sensors were consistent with expected trends in sorption due to the properties of the test vapor and the molecular structure of the passivating ligands in the sensor films. Classification algorithms including principal components analysis and Fisher’s linear discriminant were used to evaluate the discrimination performance of an array of such sensors. Each collection of sensors produced accurate classification of most vapors, with misclassification occurring primarily for vapors that had mutually similar polarity. The classification performance for an array that contained all of the sensor collections produced nearly perfect discrimination for all vapors studied. The dependence of the array size (i.e., the number of sensors) and the array chemical diversity on the discrimination performance indicated that, for an array of 20 sensors, an array size of 13 sensors or more produced the maximum discrimination performance.

Item Type:Article
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URLURL TypeDescription
Brunschwig, Bruce S.0000-0002-6135-6727
Lewis, Nathan S.0000-0001-5245-0538
Additional Information:© 2011 American Chemical Society. Received: November 11, 2010. Revised: January 06, 2011. Article ASAP March 15, 2011. Published In Issue April 14, 2011. This article was published ASAP on March 15, 2011. Figures 5, 6, and 7 and their captions have been modified. The correct version was published on March 21, 2011. T.G. acknowledges the support from Tyco Electronics Corp. Research was carried out in the Molecular Materials Research Center of the Beckman Institute at Caltech. This work was supported by the NSF and by DHS. NSF is acknowledged for a graduate fellowship to E.G.-B.
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Tyco Electronics CorporationUNSPECIFIED
NSF Graduate Research FellowshipUNSPECIFIED
Department of Homeland SecurityUNSPECIFIED
Issue or Number:14
Record Number:CaltechAUTHORS:20110425-094627953
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Official Citation:Response and Discrimination Performance of Arrays of Organothiol-Capped Au Nanoparticle Chemiresistive Vapor Sensors Edgardo García-Berríos, Ting Gao, Jordan C. Theriot, Marc D. Woodka, Bruce S. Brunschwig, Nathan S. Lewis The Journal of Physical Chemistry C 2011 115 (14), 6208-6217
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:23444
Deposited By: Tony Diaz
Deposited On:25 Apr 2011 17:08
Last Modified:09 Nov 2021 16:14

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