Correlation between the microscopic and macroscopic characteristics of SnO2 thin film gas sensors
- Citation:
- Lopes, A.a, Fortunato Nunes Vilarinho Martins E. a P. a. "Correlation between the microscopic and macroscopic characteristics of SnO2 thin film gas sensors." International Journal of Inorganic Materials. 3 (2001): 1349-1351.
Abstract:
Hall effect measurements have been used to evaluate the conduction mechanism, exhibited by tin oxide thin film gas sensors deposited by spray pyrolysis. Two experiments have been carried out: (i) Hall measurements in air and (ii) in the presence of methane (first results reported), both as a function of temperature. From the measurements performed it was possible to infer the potential barrier and its dependence with the atmosphere used. The results obtained for the carrier concentration and mobility have been analysed in the light of the oxygen diffusion mechanism at grain boundaries by using the grain boundary-trapping model. In the presence of the methane gas the electrical resistivity decreases due to the lowering of the inter-grain boundary barrier height. © 2001 Published by Elsevier Science Ltd.
Notes:
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