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

Author

Tamaki, J. ; Maekawa, T. ; Miura, N. ; Yamazoe, N.

Author_Institution

Dept. of Mater. Sci. & Technol., Kyushu Univ., Fukuoka, Japan

fYear

1991

Firstpage

150

Lastpage

153

Abstract

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.<>

Keywords

chemical variables measurement; copper compounds; electric sensing devices; gas sensors; hydrogen compounds; p-n heterojunctions; semiconductor devices; semiconductor materials; tin compounds; 200 degC; CuO; CuO-SnO/sub 2/; CuS; H/sub 2/S; SnO/sub 2/; disruption; gas selective semiconductor sensor; p-n junctions; recovery; reoxidation; sulfurization; Copper; Electric resistance; Electrical resistance measurement; Gas detectors; Gases; Powders; Roentgenium; Spectroscopy; Temperature sensors; Tin;

fLanguage

English

Publisher

ieee

Conference_Titel

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

Conference_Location

San Francisco, CA, USA

Print_ISBN

0-87942-585-7

Type

conf

DOI

10.1109/SENSOR.1991.148825

Filename

148825