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Nanocrystalline Materials as Potential Gas Sensing Elements

Published online by Cambridge University Press:  10 February 2011

G. S. V. Coles  and
G. Williams
G. S. V. Coles
Affiliation:
Department of Electrical and Electronic Engineering, University of Wales, Swansea, SA2 8PP, UK.
G. Williams
Affiliation:
Department of Electrical and Electronic Engineering, University of Wales, Swansea, SA2 8PP, UK.
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Abstract

Sensors and Transducers, and in the specific context of this paper gas sensors, are currently amongst the largest growth areas in the modem electronics industry and this seems likely to continue for the foreseeable future. Nanocrystalline materials posses many properties that could make them ideal as potential gas sensing elements with many advantages over their microcrystalline counterparts. Most importantly these include increased surface area coupled with reduced sintering temperatures and times. However, it should also be noted that there are several disadvantages including the comparatively high cost of materials and increased electrical resistance.

This paper reviews the operating mechanisms of semiconductor gas sensors and the possible advantages of using nano sized powders to produce gas sensitive devices. Results are presented which have been obtained from several materials produced by laser evaporation including alumina (Al2O3), zirconia (ZrO2), and tin dioxide (SnO2) in contaminated atmospheres incorporating carbon monoxide, hydrogen and methane.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 501: Symposium FF – Surface Controlled Nanoscale Materials for High-Added… , 1997 , 33
Copyright
Copyright © Materials Research Society 1998

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References

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