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« ҳ2 »
0873–0895 (2012)

PACS numbers: 61.72.J-, 61.80.Jh, 61.82.Rx, 78.55.Hx, 78.67.Sc, 81.20.Fw, 81.40.Wx

Thin nanocrystalline ҳ2, TiO2/Ag and TiO2/Au films are fabricated, using the solgel synthesis method. Optical conductivity, ?(), is determined, using the spectral ellipsometry method. Depending on the makeup of the nanocomposite, optical conductivity ?() differs characteristically due to light absorption caused by the presence of the structure intrinsic defects: oxygen vacancies (F2+-, F- and F+-centres), Ti3+ ions, and interstitial Ti atoms. The photoluminescence spectra of ҳ2, TiO2/Ag and TiO2/Au films have several components, which correspond to different emission centres. The intensity of photoluminescence spectra depends on irradiation doses. The photocatalytic activity of films is determined by the Rhodamine B organic die degradation. Rearrangement of the electronic spectrum caused by the aforementioned defects of anatase structure in such thin films can promote the photocatalytic activity in the UV and visible spectral ranges.

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