Add time:09/26/2019         Source:infona.pl

Titanium dioxide (TiO2) thin films were deposited onto sodocalcic glass plates by the sol‐gel technique, starting from a non‐alkoxide route, namely, titanium oxy‐acetyl acetonate as Ti precursor. Film thickness effect on both the gas sensing and photocatalytic degradation performance was studied. The as‐deposited films were annealed in air at 400 °C. All the X‐ray spectra of the films show a very broad‐peak centered in a 2θ angle around 30°. In the case of the thinnest films the surface morphology is uniform and very smooth, whereas for the thickest films the corresponding surface is covered by grains with a rod‐like shape with a length on the order of 140 nm. The films were tested both for two straightforward applications: ultraviolet assisted‐degradation of methylene blue dissolved in water, at different times, as well as gas sensor in a controlled propane (C3H8) atmosphere. As the film thickness increases, the degradation of methylene blue (MB) also increases. The thickest TiO2 thin films after being exposed by 5 hours to the catalytic degradation, promoted by ultraviolet illumination, showed a final MB solution degradation in the order of 48%. This reult can be associated with the increase in the effective exposed area of the TiO2 thin films. On the other hand, the exposition of the films to a controlled propane atmosphere produced a significant change in the surface electrical resistance of the films at operating temperatures of 200 °C and above. In fact, in the case of the thickest TiO2 films, a dramatic electrical resistance change of non‐exposed and propane exposed – 560 to 0.7 MΩ –, was registered. The results show that TiO2 films deposited by an economical deposition technique, as is the case of the sol‐gel technique, could have an important potential in industrial applications. (© 2010 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

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