Journal
CERAMICS INTERNATIONAL
Volume 42, Issue 6, Pages 7490-7498Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2016.01.155
Keywords
Gas sensors; LPG sensing; Doped SnO2 thin films; Ageing characteristics; X-ray photoelectron spectra analysis
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Funding
- University Grants Commission, Govt. of India through MRP [F.38-128/2009 (SR)]
- University Grants Commission, Govt. of India through CPE [12-1/2008 (NS/PE)]
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Pure and Mg-doped SnO2 films are prepared through a spray pyrolysis reaction, wherein the light doping keeps up the tetragonal rutile SnO2 polycrystalline structure. When the compositional ratio of Mg:SnO2 is 0.6 wt%, the obtained crystallites have a size of 36 nm and show the highest response of 93% in 1000 ppm LPG, which is nearly three times larger than that of undoped SnO2. Storage under humid atmospheric conditions influences the gas response of tin oxide thin film sensors. To analyze the cause, the morphology, microstructure and composition of the films are studied in relation to the gas response of the film, with a collection on films having maximum sensitivity. It is observed that a thin surface coverage of hydroxyl groups is developed during storage at room atmosphere to cause an increase in resistance and a decline in gas response. Argon-ion etching or annealing of the samples in atmospheric air largely removes the morphological changes in the aged film surface. It has been observed that annealing of the film at the deposition temperature facilitates to go back to the initial response value. (C) 2016 Elsevier Ltd and Techna Group S.r.l. All rights reserved.
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