Journal
SENSORS AND ACTUATORS B-CHEMICAL
Volume 65, Issue 1-3, Pages 39-41Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/S0925-4005(99)00456-6
Keywords
carbon monoxide; semiconductor gas sensor; combustion exhaust; indium oxide; cobalt oxide; surface modification
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The sensitivity, as well as selectivity of an In2O3-based element to CO over H-2, was improved dramatically by the addition of 0.5 wt.% cobalt oxide and 0.04 wt.% Au. The doubly promoted element thus obtained gave excellent GO-sensing characteristics at 250 degrees C. It was suggested from the measurements of catalytic oxidation activities of the In2O3-based materials that the remarkable promotion of CO-sensing properties originated from the proper enhancement of CO oxidation activity. (C) 2000 Elsevier Science S.A. All rights reserved.
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