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Copper oxide-promoted tin oxide element for highly sensitive and selective detection of H/sub 2/S

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4 Author(s)
Tamaki, J. ; Dept. of Mater. Sci. & Technol., Kyushu Univ., Fukuoka, Japan ; Maekawa, T. ; Miura, N. ; Yamazoe, N.

The sensing behavior of SnO/sub 2/ elements loaded with various metal oxides in response to H/sub 2/S in air was examined. Among them, CuO-SnO/sub 2/ elements showed unique behavior with extremely high sensitivity and selectivity to H/sub 2/S as well as fast recovery. The optimum operation temperature and CuO loading were found to be 200 degrees C and 3-5 wt.%, respectively. The unique behavior seems to result from the disruption and recovery of p-n junctions at the interface between CuO and SnO/sub 2/ particles, brought about by the sulfurization of CuO and reoxidation of CuS, respectively. The role of CuO is to provide a new design concept of a gas selective semiconductor sensor.<>

Published in:

Solid-State Sensors and Actuators, 1991. Digest of Technical Papers, TRANSDUCERS '91., 1991 International Conference on

Date of Conference:

24-27 June 1991