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Molecular Sieve Coated Saw Device for the Detection of Carbon Dioxide in the Presence of Water

Published online by Cambridge University Press:  16 February 2011

James T. Sun ,
Christopher B. Dartt  and
Mark E. Davis
James T. Sun
Affiliation:
Chemical Engineering, California Institute of Technology, Pasadena, CA 91125
Christopher B. Dartt
Affiliation:
Chemical Engineering, California Institute of Technology, Pasadena, CA 91125
Mark E. Davis
Affiliation:
Chemical Engineering, California Institute of Technology, Pasadena, CA 91125
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Abstract

158 MHz SAW oscillators coated with organic polymers and zeolites were tested as sensors for monitoring the level of humidity and carbon dioxide in a flowing stream of nitrogen. All coatings exhibited responses to water vapor on the order of kilohertz frequency shifts, while the responses to carbon dioxide were significantly (generally one order of magnitude) smaller. The presence of CO2 dramatically interfered with the detection of water with poly-(ethylenimine) (PEI) coatings. Poly-vinyl pyridine (PVP) coatings showed large responses to water without any interference from CO2; CO2 produced little response whether water was present or not. ZSM-5 coatings also showed no evidence of interference between water and CO2; a detectable response for CO2 is possible in humid nitrogen.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 360 , 1994 , 359
Copyright
Copyright © Materials Research Society 1995

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