International Journal of Composite Materials
p-ISSN: 2166-479X e-ISSN: 2166-4919
2014; 4(5): 213-218
doi:10.5923/j.cmaterials.20140405.03
Kamran Ahmadi
Material and Energy Research Centre (MERC), Tehran, Iran
Correspondence to: Kamran Ahmadi, Material and Energy Research Centre (MERC), Tehran, Iran.
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Thin polycrystalline films of nano-size TiO2 were prepared by spray pyrolysis (aerosol was generated ultrasonically) for self-cleaning application. Titanium Butoxide aerosol was generated ultrasonically and deposited on the glass substrate. Substrate temperature was at 400°C for several durations, 3, 6, 12 and 24h in atmospheric media. The generated film at 3h has annealed at 600, 700, 800 and 1000 °C again in atmospheric media. Photo-catalyst applications of TiO2 film require specific analytical techniques to analysis structure, phases and morphology. The structure and formed phases in the films were characterized using X ray diffraction, Raman spectroscopy and scanning electron microscopy systems. The analysis verifies that the phase transformation of nano-size TiO2 grains in the films from amorphous to crystalline and from anatase to rutile phases has taken place. The transformation occurred by substrate temperature increment and evolved by annealing the films upon heating. The report presents an active and economic method to produce thin and uniform layer on the glass for self cleaning of the surface, which is novelty of the work.
Keywords: Spray pyrolysis, Titanium Butoxide, Raman spectroscopy, Photo-catalyst, Anatase, Rutile
Cite this paper: Kamran Ahmadi, Evaluation of Thin Nano-crystalline TiO2 Films Deposited by Spray Pyrolysis Method, International Journal of Composite Materials, Vol. 4 No. 5, 2014, pp. 213-218. doi: 10.5923/j.cmaterials.20140405.03.
Figure 1. Raman spectra of the films deposited on a substrate (fused quartz) the at 400°C substrate temperature and post annealed at 600-1000°C for 7h |
Figure 4. Surface morphology of TiO2 films at different durations of heating at a 400°C substrate temperature, there is no major differences between the images |