SnO2 center dot Nb2O5 films for ethanol sensor, obtained by deposition of alcoholic suspensions

Films of (1 - x)SnO2 . xNb(2)O(5) were prepared by the deposition of alcoho lic suspensions, using Spin Coating Techniques. The powders used in the pre paration of the suspensions were obtained by the polymeric precursor method . Results of X-ray Diffraction (XRD) indicate that the material has a singl e SnO2 phase. Scanning Electron Microscopy (SEM) and Atomic Force Microscop y (AFM) showed quite homogeneous and porous films, without cracks and with large surface area. The electrical characterization of the samples indicate s good sensitivity to ethanol at 200 degrees C, response times in the order of 100 s and resistance in the order of 20 k Omega, at room temperature. ( C) 2000 Elsevier Science B.V. All rights reserved.