Towards Enhanced Detection of Chemical Agents: Design and Development of a Microfabricated Preconcentrator

Cascade Avalanche Sorbent Plate ARray (CASPAR), a micromachined hotplate coated with sorbent polymer, has been demonstrated earlier as a selective preconcentrator for chemical agents and explosives. Up to two orders of magnitude increase in sensitivity has been established by incorporating CASPAR as...

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Bibliographic Details
Main Authors: Pai, R.S., McGill, R.A., Stepnowski, S.V., Stepnowski, J.L., Williams, K.P., Summers, H., Furstenberg, R., Rake, M.T., Nguyen, V.K., Simonson, D.L., Higgins, B., Kendziora, C., Houser, E.J.
Format: Conference Proceeding
Language:English
Subjects:
Chemical Agents
Chemical analysis
Chemical hazards
Chemical Sensor
Design optimization
Detectors
Explosives
Flow-through
Fluorescence
Focusing Device
Hazardous Chemicals
Heating
Illicit Materials
Ion Mobility Spectroscopy
MEMS
Microfabricated Preconcentrator
Polymer films
Stability analysis
Tagging
Trace Detection
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Summary:Cascade Avalanche Sorbent Plate ARray (CASPAR), a micromachined hotplate coated with sorbent polymer, has been demonstrated earlier as a selective preconcentrator for chemical agents and explosives. Up to two orders of magnitude increase in sensitivity has been established by incorporating CASPAR as a front end-modification to commercial detectors. Experimental evidence obtained via thermal imaging and fluorescent particle flow tagging suggests that an 8.5 mm times 8.5 mm current hotplate design is sub-optimal due to non-uniformities in the heating and vapor/particle collection profiles. In this study, we discuss the CASPAR design optimization with the aim to enhance the collection efficiency of hazardous chemical vapor while maintaining thermal stability and precise control before injection of a focused pulse of analyte into a detector.
ISSN:2159-547X
DOI:10.1109/SENSOR.2007.4300627