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Vapor Sensing Using Polymer/Carbon Black Composites in the Percolative Conduction Regime

Sisk, Brian C. and Lewis, Nathan S. (2006) Vapor Sensing Using Polymer/Carbon Black Composites in the Percolative Conduction Regime. Langmuir, 22 (18). pp. 7928-7935. ISSN 0743-7463. doi:10.1021/la053287s.

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To investigate the behavior of chemiresistive vapor sensors operating below or around the percolation threshold, chemiresistors have been formed from composites of insulating organic polymers and low mass fractions of conductive carbon black (CB, 1−12% w/w). Such sensors produced extremely large relative differential resistance changes above certain threshold vapor concentrations. At high analyte partial pressures, these sensors exhibited better signal/noise characteristics and were typically less mutually correlated in their vapor response properties than composites formed using higher mass fractions of CB in the same set of polymer sorption layers. The responses of the low-mass-fraction CB sensors were, however, less repeatable, and their nonlinear response as a function of analyte concentration required more complicated calibration schemes to identify and quantify analyte vapors to compensate for drift of a sensor array and to compensate for variability in response between sensor arrays. Because of their much larger response signals, the low-mass-fraction CB sensors might be especially well suited for use with low-precision analog-to-digital signal readout electronics. These sensors serve well as a complement to composites formed from higher mass fractions of CB and have yielded insight into the tradeoffs of signal-to-noise improvements vs complexity of signal processing algorithms necessitated by the use of nonlinearly responding detectors in array-based sensing schemes.

Item Type:Article
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Lewis, Nathan S.0000-0001-5245-0538
Additional Information:© 2006 American Chemical Society. Received 5 December 2005. Published online 26 July 2006. Published in print 1 August 2006. We acknowledge the ARO, NIH, HSARPA, and DARPA for support of this work.
Funding AgencyGrant Number
Army Research Office (ARO)UNSPECIFIED
Homeland Security Advanced Research Projects Agency (HSARPA)UNSPECIFIED
Defense Advanced Research Projects Agency (DARPA)UNSPECIFIED
Issue or Number:18
Record Number:CaltechAUTHORS:20170725-100501150
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Official Citation:Vapor Sensing Using Polymer/Carbon Black Composites in the Percolative Conduction Regime Brian C. Sisk and Nathan S. Lewis Langmuir 2006 22 (18), 7928-7935 DOI: 10.1021/la053287s
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:79327
Deposited By: Ruth Sustaita
Deposited On:25 Jul 2017 18:25
Last Modified:15 Nov 2021 17:47

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