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Sensors 2014, 14(11), 20480-20499;

Analysis of SnO2|WO3 Heterocontact Properties during the Detection of Hydrogen Sulphide

Wroclaw University of Technology, Faculty of Microsystem Electronics and Photonics, Janiszewskiego 11/17, Wroclaw 50-372, Poland
Author to whom correspondence should be addressed.
Received: 25 June 2014 / Revised: 19 September 2014 / Accepted: 20 October 2014 / Published: 30 October 2014
(This article belongs to the Section Chemical Sensors)
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The main objective of the paper was the analysis of the properties of SnO2|WO3 heterocontact as well as the determination of its response to 50 ppm of hydrogen sulphide. It was noticed that the sensitivity of the sensor being tested to hydrogen sulphide depended significantly on the polarization direction. When its parameters were compared with those of sensors the gas-sensitive layer of which was made only from one type of metal oxide, a high impact of the heterocontact on the electric charge transport was noticed. The value of the activation energy of the electric conductivity is clearly dependent on the polarization direction. A mechanism of physicochemical processes occurring in a planar sensor with a heterocontact was suggested, and three areas differing in the width of depleted layer, where the inter-phase boundary of SnO2|WO3 had the most essential impact on the parameters of the sensor being tested, were distinguished and described. View Full-Text
Keywords: metal oxide; gas sensors; hydrogen sulphide; heterocontact metal oxide; gas sensors; hydrogen sulphide; heterocontact
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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Suchorska-Woźniak, P.; Rac, O.; Fiedot, M.; Teterycz, H. Analysis of SnO2|WO3 Heterocontact Properties during the Detection of Hydrogen Sulphide. Sensors 2014, 14, 20480-20499.

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