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16 December 2004 In situ Raman probe for chemical agents using ultraporous substrates
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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.
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Charles F. Windisch Jr., Yongsoon Shin, and Gregory J. Exarhos "In situ Raman probe for chemical agents using ultraporous substrates", Proc. SPIE 5585, Chemical and Biological Point Sensors for Homeland Defense II, (16 December 2004);

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