Title :
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
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;
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
DOI :
10.1109/SENSOR.1991.148825
