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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
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
Copyright
Copyright © Materials Research Society 1996

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References

[1] Sukkar, M. H. and Tuller, H. L. in Advances in Ceramics, Vol. 7, Additives and Interfaces in Electronic Ceramics edited by Yan, M. F. and Heuer, A. H. (American Ceramic Society, Columbus, OH. 1983) pp. 7190.Google Scholar
[2] Gupta, T. K., J. Amer. Ceram. Soc., 73 [7] pp. 18171840 (1990).CrossRefGoogle Scholar
[3] Agarwal, G., Speyer, R. F. and Hackenberger, W. S., J. Mater. Res. 11 [3], pp. 671676 (1996).CrossRefGoogle Scholar
[4] Azad, A. M., Akbar, S. A., Mhaisalkar, S. G., Birkfield, L. D., and Goto, K. S., J. Electrochemical Society, 139 [12] (1992).Google Scholar

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