Abstract
From the results of various spectroscopic investigations of Ti-oxide-based binary oxides, it was found that tetrahedrally coordinated Ti-oxide species are formed in the thin films of Ti/Si binary oxides with low TiO 2 content, while octahedrally coordinated TiO 2 nano-particles are formed in the Ti/B binary oxide thin films, reflecting the effect of the crystalline structures of the host SiO 2 or B 2O 3 on the local structure of the guest Ti-oxide species, respectively. The photocatalytic reactivity of the TiO 2 thin films was found to be remarkably enhanced by the dispersion of the Ti-oxide moiety into both the SiO 2 and B 2O 3 matrices, whereas the photo-induced super-hydrophilic properties of the TiO 2 thin films were enhanced only by a combination or mixing of the Ti-oxide moiety with B 2O 3.
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