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Gas Sensing Behavior of Porous ZnO Varistors Densified via Rate Controlled Sintering

Published online by Cambridge University Press:  10 February 2011

Gaurav Agarwal  and
Robert F. Speyer
Gaurav Agarwal
Affiliation:
Materials Science and Engineering, Georgia Institute of Technology, Atlanta, GA 30332
Robert F. Speyer
Affiliation:
Materials Science and Engineering, Georgia Institute of Technology, Atlanta, GA 30332
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Abstract

A hydrogen gas sensor based on shift in breakdown voltage of a ZnO varistor was developed. Changes in rate controlled sintering schedules resulted in significant variations in microstructure. Microstructures showing more intergranular porosity and finer grain size demonstrated a comparatively more linear and broad response to H2 concentration. A mechanism for the shift in breakdown voltage based on adsorbed oxygen is suggested for this unique and potentially very useful sensor.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 431: Symposium P – Microporous and Macroporous Materials , 1996 , 427
Copyright
Copyright © Materials Research Society 1996

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References

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