Analysis of CO and NH3 Reductive Gases Mixture by Chemically Modified Nanocrystalline Tin Dioxide

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Abstract:

The possibility to discriminate two reducing gases CO and NH3 in their mixture by semiconductor gas sensors based on modified nanocrystalline tin dioxide was demonstrated. The selectivity was achieved by the optimization of SnO2 microstructure, surface modifier and operating temperature. Introducing catalytic clusters of palladium or ruthenium oxides increased tin dioxide sensitivity to CO at low temperature and to ammonia at raised temperature, respectively. Cross-sensing tests verified that SnO2/RuO2 sensors are selective to NH3 in comparison with CO, while SnO2/PdO displayed a complex behaviour in the presence of both gases. Possible sensor signal formation routes are discussed regarding the modifiers catalytic action and their distinctive influence on surface active sites.

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227-230

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April 2014

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© 2014 Trans Tech Publications Ltd. All Rights Reserved

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