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Revista mexicana de ingeniería química
versão impressa ISSN 1665-2738
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.