Resumo

TIRADO GUERRA, S.. SnO₂: Agn thin films prepared by SOL-GEL applied as propane gas sensors. Rev. Mex. Ing. Quím [online]. 2015, vol.14, n.3, pp.691-701. ISSN 1665-2738.

SnO₂ thin films were fabricated by the sol-gel process and repeated immersion technique and deposited on soda-lime substrates. Tin chloride was used as precursor of tin, a 0.2 M solution in 2-methoxyethanol as a solvent and the monoethanolamine as a stabilizer was prepared. From silver nitrate a solution in ethanol was prepared and superficially incorporated onto SnO₂ films, thus obtaining SnO₂:Agn, where n= 0, 1, 3, 5 and 10 times impregnated with silver solution. A series of samples of approximately 150 nm thickness were prepared and were studied. Several layers of Ag were applied superficially on SnO₂ films. The thin films thus obtained are characterized by their structure, XRD, morphology by SEM and chemical composition by EDS, grain shape and size, porosity and surface roughness by AFM, and their electrical and optical (UV-Vis). Properties of SnO₂:Agn samples to propane gas detection in the range of 0-500 ppm gas concentration were tested operating at temperatures of 23, 100, 200 and 300 °C. The results of a selection of these sensors are presented in this paper.

Palavras-chave : thin films; tin dioxide; sol-gel; gas sensors; propane.

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