Journal
SENSORS AND ACTUATORS B-CHEMICAL
Volume 93, Issue 1-3, Pages 495-502Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/S0925-4005(03)00192-8
Keywords
sol-gel; W/TiO2; ethanol sensor; breath analyzer
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TiO2 and W-doped TiO2 thin films have been obtained by a chemically modified sol-gel technique, that implies hydrolysis and condensation of Titanium(VI) ethoxide (TEOT) (and tungsten(V) ethoxide) in the presence of a polymer dissolved in ethanol. Dopant was added in concentration that led to nominal W/Ti atomic ratio of 5/33 and 10/33. Film deposition by spin-coating was per-formed onto allumina substrates. Annealing at 500 degreesC produced nanosized structurally stable oxides films. Structural characterization of these films was made by means of glancing incidence X-ray diffraction (GIXRD). Scanning electron microscopy (SEM) cross-section images were collected and an estimation of the films thickness was obtained. W/Ti atomic ratio was determined by Rutherford back scattering (RBS) analysis. The electrical response towards ethanol and methanol (100-500 ppm) have been tested in the temperature range of 300-500 degreesC. Doping effects on structural and sensing properties were investigated. A comparison with the previous obtained dip-coated W/TiO2 thin films have been reported. (C) 2003 Published by Elsevier Science B.V.
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