Title :
The role of additives in SnO/sub 2/ semiconductor gas sensors
Author :
Cheong Hae-Won ; Choi Jeong-Ja ; Kim, H.P. ; Kim Jong-Myong ; Kim Jae-Mook
Author_Institution :
Agency for Defense Dev., Taejeon, South Korea
Abstract :
The effects of additives on the gas sensitivity to CH/sub 3/CN and CO are examined. The overall trends are similar in both gases. The Al-loaded SnO/sub 2/ sensor shows a slight increase in the sensitivity as compared with SnO/sub 2/. The Nb-loaded SnO/sub 2/ sensor decreases the sensitivity except in the low-temperature region. For CH/sub 3/, Pd does not appreciably improve the sensitivity in the low-temperature region in the sensors considered. However, the Pd-loaded SnO/sub 2/ enhances the sensitivity to CO in the low-temperature region. XPS studies suggest that the oxidation states of Pd are 4+ and 2+ with a relative ratio of 3:1.<>
Keywords :
carbon compounds; electric sensing devices; gas sensors; niobium; organic compounds; palladium; semiconductor devices; semiconductor materials; tin compounds; CH/sub 3/CN; CO; SnO/sub 2/ semiconductor gas sensors; SnO/sub 2/:Nb; SnO/sub 2/:Pd; XPS; additives; gas sensitivity; methyl cyanide; oxidation states; Additives; Electrons; Gas detectors; Gases; Gold; Oxidation; Powders; Spectroscopy; Temperature sensors; X-ray diffraction;
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.1991.148826
