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

Marc D. Woodka, Bruce S. Brunschwig, Nathan S Lewis

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Citation (Scopus)

Abstract

Linear sensor arrays made from small molecule/carbon black composite chemiresistors placed in a low headspace volume chamber, with vapor delivered at low flow rates, allowed for the extraction of chemical information that significantly increased the ability of the sensor arrays to identify vapor mixture components and to quantify their concentrations. Each sensor sorbed vapors from the gas stream to various degrees. Similar to gas chromatography, species having high vapor pressures were separated from species having low vapor pressures. Instead of producing typical sensor responses representative of thermodynamic equilibrium between each sensor and an unchanging vapor phase, sensor responses varied depending on the position of the sensor in the chamber and the time from the beginning of the analyte exposure. This spatiotemporal (ST) array response provided information that was a function of time as well as of the position of the sensor in the chamber. The responses to pure analytes and to multi-component analyte mixtures comprised of hexane, decane, ethyl acetate, chlorobenzene, ethanol, and/or butanol, were recorded along each of the sensor arrays. Use of a non-negative least squares (NNLS) method for analysis of the ST data enabled the correct identification and quantification of the composition of 2-, 3-, 4- and 5-component mixtures from arrays using only 4 chemically different sorbent films and sensor training on pure vapors only. In contrast, when traditional time- and position-independent sensor response information was used, significant errors in mixture identification were observed. The ability to correctly identify and quantify constituent components of vapor mixtures through the use of such ST information significantly expands the capabilities of such broadly cross-reactive arrays of sensors.

Original languageEnglish
Title of host publicationProceedings of SPIE - The International Society for Optical Engineering
Volume6932
DOIs
Publication statusPublished - 2008
EventSensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems 2008 - San Diego, CA, United States
Duration: Mar 10 2008Mar 13 2008

Other

OtherSensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems 2008
CountryUnited States
CitySan Diego, CA
Period3/10/083/13/08

Fingerprint

Sensor arrays
sorption
Sorption
sensors
Sensors
Vapors
vapors
Vapor pressure
chambers
vapor pressure
Sorbents
Carbon black
Hexane
Butenes
Gas chromatography
gas streams
chlorobenzenes
sorbents
Ethanol
least squares method

Keywords

  • Carbon black composite sensors
  • Electronic nose
  • Sensor arrays
  • Spatiotemporal response
  • Vapor detection

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Condensed Matter Physics

Cite this

Woodka, M. D., Brunschwig, B. S., & Lewis, N. S. (2008). Extraction of spatiotemporal response information from sorption-based cross-reactive sensor arrays for the identification and quantification of analyte mixtures. In Proceedings of SPIE - The International Society for Optical Engineering (Vol. 6932). [69321M] https://doi.org/10.1117/12.781517

Extraction of spatiotemporal response information from sorption-based cross-reactive sensor arrays for the identification and quantification of analyte mixtures. / Woodka, Marc D.; Brunschwig, Bruce S.; Lewis, Nathan S.

Proceedings of SPIE - The International Society for Optical Engineering. Vol. 6932 2008. 69321M.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Woodka, MD, Brunschwig, BS & Lewis, NS 2008, Extraction of spatiotemporal response information from sorption-based cross-reactive sensor arrays for the identification and quantification of analyte mixtures. in Proceedings of SPIE - The International Society for Optical Engineering. vol. 6932, 69321M, Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems 2008, San Diego, CA, United States, 3/10/08. https://doi.org/10.1117/12.781517
Woodka, Marc D. ; Brunschwig, Bruce S. ; Lewis, Nathan S. / Extraction of spatiotemporal response information from sorption-based cross-reactive sensor arrays for the identification and quantification of analyte mixtures. Proceedings of SPIE - The International Society for Optical Engineering. Vol. 6932 2008.
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