Sol-gel TiO2 and W/TiO2 nanostructured thin films for control of drunken driving

TiO2 and W/TiO2 thin films have been prepared by a chemically modified sol-gel technique. Oxide-polymer thin films were deposited by dip-coating. Annealing at 500 degreesC results in nanosized structurally stable oxides films. The dopant concentration led to nominal W:Ti ratio of 1:33, 5:33, 10:33. The morphological and structural characteristics of thin films were studied through microraman, glancing incidence X-ray diffraction (GLXRD), SEM and TEM. A microstructural comparison between pure and doped TiO2 layers is reported. Ethanol sensing properties are tested. TiO2 and W/TiO2 structural features and sensing characteristics are compared. (C) 2002 Elsevier Science B.V. All rights reserved.