Abstract
The WO 3 and WTiO thin-films were prepared by sol–gel dip-coating on alumina substrate using tungsten chloride, 2,4-pentanedione (PTN), ethanol and water as sources and calcined at 400 °C. The structure was characterized by XRD, Raman, SEM and TEM analyses. The effect of titanium doping on the structure was then discussed and related to the gas sensing properties. The results show that the sensitivities for detecting 10 ppm NO 2 were 82 and 1768 by WO 3 and WTiO gas sensors at 200 °C, respectively. The huge increase in sensitivity by adding titanium ion arose from the grain size reduction of the films and the doping effect on Debye length. The improved sensitivity, recovery, and reliability suggest that WO 3 and WTiO thin-films prepared by sol–gel dip-coating can be used for NO 2 gas sensing.
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