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Proceedings Paper

Sorbent coatings for nitroaromatic vapors: applications with chemical sensors
Author(s): Robert Andrew McGill; Todd E. Mlsna; Russell Chung; Viet K. Nguyen; Jenifer Stepnowski; Michael H. Abraham; Paul H. Kobrin
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Paper Abstract

The solubility properties of a series of nitroaromatic compounds have been determined and utilized with known linear solvation energy relationships to calculate their sorption properties in a series of chemoselective polymers. These measurements and results were used to design a series of novel chemoselective polymers to target polynitroaromatic compounds. The polymers have been evaluated as thin sorbent coatings on surface acoustic wave (SAW) devices for their vapor sorption and selectivity properties. The most promising materials tested, include siloxane polymers functionalized with acidic pendant groups that are complimentary in their solubility properties for nitroaromatic compounds. The most sensitive of the new polymers exhibit SAW sensor detection limits for nitrobenzene and 2,4-dinitrotoluene at 3 parts per billion (ppb) and 235 parts per trillion (ppt) respectively. Optimized polymers exhibit low water vapor sorption, and rapid signal kinetics for nitrobenzene, reaching 90% of signal response in 4 seconds. Studies with an in-situ infra-red spectroscopy technique are used to determine the mechanism of interaction between nitroaromatic compounds and the chemoselective polymer.

Paper Details

Date Published: 4 September 1998
PDF: 6 pages
Proc. SPIE 3392, Detection and Remediation Technologies for Mines and Minelike Targets III, (4 September 1998); doi: 10.1117/12.324210
Show Author Affiliations
Robert Andrew McGill, Naval Research Lab. (United States)
Todd E. Mlsna, Geo-Centers, Inc. (United States)
Russell Chung, Geo-Centers, Inc. (United States)
Viet K. Nguyen, Geo-Centers, Inc. (United States)
Jenifer Stepnowski, Geo-Centers, Inc. (United States)
Michael H. Abraham, Univ. College London (United Kingdom)
Paul H. Kobrin, Rockwell Science Ctr. (United States)

Published in SPIE Proceedings Vol. 3392:
Detection and Remediation Technologies for Mines and Minelike Targets III
Abinash C. Dubey; James F. Harvey; J. Thomas Broach, Editor(s)

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