Apparatus for sensing volatile organic chemicals in fluids

Hughes, Robert C.; Manginell, Ronald P.; Jenkins, Mark W.; Kottenstette, Richard; Patel, Sanjay V.

Apparatus for sensing volatile organic chemicals in fluids

Patent · Tue Jun 07 00:00:00 EDT 2005

OSTI ID:1175378

Hughes, Robert C.; Manginell, Ronald P.; Jenkins, Mark W.; Kottenstette, Richard; Patel, Sanjay V.

A chemical-sensing apparatus is formed from the combination of a chemical preconcentrator which sorbs and concentrates particular volatile organic chemicals (VOCs) and one or more chemiresistors that sense the VOCs after the preconcentrator has been triggered to release them in concentrated form. Use of the preconcentrator and chemiresistor(s) in combination allows the VOCs to be detected at lower concentration than would be possible using the chemiresistor(s) alone and further allows measurements to be made in a variety of fluids, including liquids (e.g. groundwater). Additionally, the apparatus provides a new mode of operation for sensing VOCs based on the measurement of decay time constants, and a method for background correction to improve measurement precision.

Research Organization:: Sandia National Laboratories (SNL-CA), Livermore, CA (United States)

Sponsoring Organization:: USDOE

DOE Contract Number:: AC04-94AL85000

Assignee:: Sandia Corporation

Patent Number(s):: 6,902,701

Application Number:: 09/974,327

OSTI ID:: 1175378

Country of Publication:: United States

Language:: English

References (6)

Application of the Solubility Parameter Concept to the Design of Chemiresistor Arrays Eastman, M. P.; Hughes, R. C.; Yelton, G. Journal of The Electrochemical Society, Vol. 146, Issue 10 https://doi.org/10.1149/1.1392571	journal	October 1999
Template-Based Approaches to the Preparation of Amorphous, Nanoporous Silicas Raman, Narayan K.; Anderson, Mark T.; Brinker, C. Jeffrey Chemistry of Materials, Vol. 8, Issue 8, p. 1682-1701 https://doi.org/10.1021/cm960138+		August 1996
Microporous Silica Prepared by Organic Templating: Relationship between the Molecular Template and Pore Structure Lu, Yunfeng; Cao, Guozhong; Kale, Rahul P. Chemistry of Materials, Vol. 11, Issue 5, p. 1223-1229 https://doi.org/10.1021/cm980517y	journal	May 1999
Solid-Phase Microextraction. A Solvent-Free Alternative for Sample Preparation Zhang, Zhouyao; Yang, Min J.; Pawliszyn, Janusz Analytical Chemistry, Vol. 66, Issue 17 https://doi.org/10.1021/ac00089a001	journal	September 1994
Differentiation of Chemical Components in a Binary Solvent Vapor Mixture Using Carbon/Polymer Composite-Based Chemiresistors Patel, Sanjay V.; Jenkins, Mark W.; Hughes, Robert C. Analytical Chemistry, Vol. 72, Issue 7 https://doi.org/10.1021/ac990830z	journal	April 2000
Integrated chemiresistor array for small sensor platforms Hughes, Robert C.; Casalnuovo, Stephen A.; Wessendorf, Kurt O. AeroSense 2000, SPIE Proceedings https://doi.org/10.1117/12.396280	conference	August 2000

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Apparatus for sensing volatile organic chemicals in fluids

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