%0 Journal Article %T Aplicaci¨®n de peliculas delgadas de SnO2 y SnO2:Ru como sensores de propano %A Aguilar-Leyva %A J. %A Maldonado %A A. %A Olvera %A M. de la L. %J Superficies y vac¨Şo %D 2012 %I Sociedad Mexicana de Ciencia y Tecnologia de Superficies y Materiales %X in this work we report the sensing properties of undoped and ruthenium-doped tin oxide thin films (sno2, sno2:ru) with different thicknesses, in a controlled atmosphere of propane gas (c3h8) at different operation temperatures. the films were deposited onto soda-lime glass substrates by the spray pyrolysis technique at different deposition temperatures, namely, 300, 350, 400, and 450ˇăc. all the films were annealed in vacuum at 400ˇăc during 1 h in order to stabilize the surface physical characteristics. the sensing properties of the films were characterized by the surface electrical resistance ratio in a c3h8 atmosphere, and air as reference. maximum sensitivities, on the order of 1.4 and 7.4 were obtained for undoped sno2, and, sno2:ru thin films, respectively. %K thin films %K semiconductor oxides %K tin oxide %K propane gas sensors. %U http://www.scielo.org.mx/scielo.php?script=sci_abstract&pid=S1665-35212012000200010&lng=en&nrm=iso&tlng=en