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[Preparation and spectral characteristic of TiO2/SnO2 composite oxides].

To study the spectral characteristic of TiO2/SnO2, TiO2/SnO2 composite oxide with SnO2 inside kernel was fabricated by colloid chemistry method, and was studied with UV-visible absorption spectrum, X-ray diffraction and infrared spectrum. The results showed that the bandgap widths of TiO2 and TiO2/SnO2 were 4.13 and 3.86 eV, respectively. TiO2/SnO2 had a widest and strong absorption band in the ultraviolet range. There was a quantum effect. In the X-ray diffraction, the station of TiO2 (110) diffraction peak moved 1.6 degrees, and its intensity changed. Compared with TiO2 infrared spectrum, the Ti--O stretching vibration of TiO2/SnO2 moved from 500 to 656 cm(-1), and had 560 cm(-1) shoulder peak. The intensity of the peaks near 1 650 and 3 420 cm(-1) corresponding to water absorbing peaks increased.