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Chemosensors 2015, 3(4), 241-252; doi:10.3390/chemosensors3040241

Selectivity of Catalytically Modified Tin Dioxide to CO and NH3 Gas Mixtures

Chemistry Department, Moscow State University, Vorobyevy gory 1-3, Moscow 119991, Russia
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Academic Editor: Russell Binions
Received: 2 September 2015 / Revised: 25 September 2015 / Accepted: 28 September 2015 / Published: 9 October 2015
(This article belongs to the Special Issue Chemical Vapor Sensing)
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Abstract

This paper is aimed at selectivity investigation of gas sensors, based on chemically modified nanocrystalline tin dioxide in the detection of CO and ammonia mixtures in air. Sol-gel prepared tin dioxide was modified by palladium and ruthenium oxides clusters via an impregnation technique. Sensing behavior to CO, NH3 and their mixtures in air was studied by in situ resistance measurements. Using the appropriate match of operating temperatures, it was shown that the reducing gases mixed in a ppm-level with air could be discriminated by the noble metal oxide-modified SnO2. Introducing palladium oxide provided high CO-sensitivity at 25–50 °C. Tin dioxide modified by ruthenium oxide demonstrated increased sensor signals to ammonia at 150–200 °C, and selectivity to NH3 in presence of higher CO concentrations. View Full-Text
Keywords: gas mixture analysis; selectivity; gas sensors; nanocrystalline tin dioxide; surface modification; carbon monoxide; ammonia gas mixture analysis; selectivity; gas sensors; nanocrystalline tin dioxide; surface modification; carbon monoxide; ammonia
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Marikutsa, A.; Rumyantseva, M.; Gaskov, A. Selectivity of Catalytically Modified Tin Dioxide to CO and NH3 Gas Mixtures. Chemosensors 2015, 3, 241-252.

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