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Zeotite Modification: Towards Discriminating Metal Oxide Gas Sensors

Binions, R; Afonja, A; Dungey, S; Lewis, D; Parkin, IP; Williams, DE; (2009) Zeotite Modification: Towards Discriminating Metal Oxide Gas Sensors. In: Li, J and Vanysek, P and Brown, R and BrucknerLea, C and Hatchet, D and Josowicz, M, (eds.) 35 YEARS OF CHEMICAL SENSORS - AN HONORARY SYMPOSIUM FOR PROFESSOR JIRI JANATA'S 70TH BIRTHDAY CELEBRATION. (pp. 241 - 250). ELECTROCHEMICAL SOCIETY INC

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Abstract

The use of zeolites to enhance the response and discriminating power of solid-state metal-oxide semiconductor gas-sensors is demonstrated. Thick film sensors were prepared by screen printing layers of tungsten trioxide (WO3) or chromium titanium oxide (CTO) with various zeolites as over-layers. The sensors' gas response was tested against two similar gases, ethanol and isopropyl alcohol. The sensors are able to discriminate effectively between these two gases. The origin of this discriminatory behavior is elucidated through understanding the diffusion and reaction processes occurring in the zeolite transformation layer and sensor element.

Type:Proceedings paper
Title:Zeotite Modification: Towards Discriminating Metal Oxide Gas Sensors
Event:1st International Symposium on Emerging Materials for Post-CMOS Applications held at the 215th Meeting of the Electrochemical-Society
Location:San Francisco, CA
Dates:2009-05-25 - 2009-05-29
ISBN-13:978-1-56677-714-8
Keywords:SEMICONDUCTING OXIDES, SENSITIVE RESISTORS, SELECTIVITY
UCL classification:UCL > School of BEAMS > Faculty of Maths and Physical Sciences > Chemistry

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