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Proceedings Paper

In situ Raman probe for chemical agents using ultraporous substrates
Author(s): Charles F. Windisch Jr.; Yongsoon Shin; Gregory J. Exarhos
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Paper Abstract

As part of an effort to develop a portable probe for real-time detection of chemical agents using Raman spectroscopy, the kinetics of adsorption of selected volatile organic molecules on high surface area silica supports was studied using Raman spectroscopy with 785-nm excitation. Two aspects of this work are described. First, the affinity of organic molecules in a flowing gas stream to ultraporous mineralized wood substrates was shown to be very high under a variety of representative conditions, suggesting that a sensor based on in-situ Raman measurement of adsorption rates may be feasible. Moreover, the mechanism of adsorption was found to vary for different molecules thereby promoting a high degree of chemical specificity. Second, the possibility of using Surface-Enhanced Raman Spectroscopy (SERS) to enhance Raman signals and thereby improve the sensitivity of an in-situ Raman probe even further was demonstrated. Detection limits were estimated based on the current state of development of the approach.

Paper Details

Date Published: 16 December 2004
PDF: 9 pages
Proc. SPIE 5585, Chemical and Biological Point Sensors for Homeland Defense II, (16 December 2004); doi: 10.1117/12.572006
Show Author Affiliations
Charles F. Windisch Jr., Pacific Northwest National Lab. (United States)
Yongsoon Shin, Pacific Northwest National Lab. (United States)
Gregory J. Exarhos, Pacific Northwest National Lab. (United States)

Published in SPIE Proceedings Vol. 5585:
Chemical and Biological Point Sensors for Homeland Defense II
Arthur J. Sedlacek III; Steven D. Christesen; Tuan Vo-Dinh; Roger J. Combs, Editor(s)

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