Array-based vapor sensing using chemically sensitive, polymer composite resistors

Mark C. Lonergan, Michael S. Freund, Erik J. Severin, Brett J. Doleman, Robert H. Grubbs, Nathan S Lewis

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

6 Citations (Scopus)

Abstract

We describe herein the construction of simple, low-power, broadly responsive vapor sensors. Insulating polymer-conductor composites have been shown to swell reversibly upon exposure to vapors. Thin films of polymer composites have been deposited across two metallic leads, with swelling-induced resistance changes of the films signaling the presence of vapors. To identify and classify vapors, arrays of such vapor-sensing elements have been constructed, with each element containing either carbon black or poly(pyrrole) as the conducting phase mixed with one of several different organic polymers as the insulating phase. A convenient chemical polymerization of poly(pyrrole) which allows a high degree of processibility is also described. The differing gas-solid partition coefficients for the various polymers of the sensor array produce a pattern of resistance changes that can be used to classify vapors and vapor mixtures. This type of sensor array has been shown to resolve common organic solvents, including molecules of different classes (such as aromatics from alcohols) as well as those within a particular class (such as benzene from toluene and methanol from ethanol). The response of an individual composite to varying concentrations of solvent is shown to be consistent with the predictions of percolation theory. Accordingly, significant increases in the signals of array elements have been observed for carbon black-polymer composites that were operated near their percolation thresholds.

Original languageEnglish
Title of host publicationIEEE Aerospace Applications Conference Proceedings
Editors Anon
Pages583-631
Number of pages49
Volume3
Publication statusPublished - 1997
EventProceedings of the 1997 IEEE Aerospace Conference. Part 4 (of 4) - Snowmass Village, CO, USA
Duration: Feb 1 1997Feb 2 1997

Other

OtherProceedings of the 1997 IEEE Aerospace Conference. Part 4 (of 4)
CitySnowmass Village, CO, USA
Period2/1/972/2/97

Fingerprint

Resistors
Vapors
Composite materials
Polymers
Sensor arrays
Carbon black
Organic polymers
Organic solvents
Toluene
Swelling
Benzene
Methanol
Alcohols
Ethanol
Polymerization
Thin films
Molecules
Sensors
Gases

ASJC Scopus subject areas

  • Engineering(all)

Cite this

Lonergan, M. C., Freund, M. S., Severin, E. J., Doleman, B. J., Grubbs, R. H., & Lewis, N. S. (1997). Array-based vapor sensing using chemically sensitive, polymer composite resistors. In Anon (Ed.), IEEE Aerospace Applications Conference Proceedings (Vol. 3, pp. 583-631)

Array-based vapor sensing using chemically sensitive, polymer composite resistors. / Lonergan, Mark C.; Freund, Michael S.; Severin, Erik J.; Doleman, Brett J.; Grubbs, Robert H.; Lewis, Nathan S.

IEEE Aerospace Applications Conference Proceedings. ed. / Anon. Vol. 3 1997. p. 583-631.

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

Lonergan, MC, Freund, MS, Severin, EJ, Doleman, BJ, Grubbs, RH & Lewis, NS 1997, Array-based vapor sensing using chemically sensitive, polymer composite resistors. in Anon (ed.), IEEE Aerospace Applications Conference Proceedings. vol. 3, pp. 583-631, Proceedings of the 1997 IEEE Aerospace Conference. Part 4 (of 4), Snowmass Village, CO, USA, 2/1/97.
Lonergan MC, Freund MS, Severin EJ, Doleman BJ, Grubbs RH, Lewis NS. Array-based vapor sensing using chemically sensitive, polymer composite resistors. In Anon, editor, IEEE Aerospace Applications Conference Proceedings. Vol. 3. 1997. p. 583-631
Lonergan, Mark C. ; Freund, Michael S. ; Severin, Erik J. ; Doleman, Brett J. ; Grubbs, Robert H. ; Lewis, Nathan S. / Array-based vapor sensing using chemically sensitive, polymer composite resistors. IEEE Aerospace Applications Conference Proceedings. editor / Anon. Vol. 3 1997. pp. 583-631
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