Sn4+-doped TiO2 nanorod array film with enhanced visible light photocatalytic activity

摘要

Sn4+-doped nanorod array film (NAF) on the fluorine-doped tin oxide (FTO) conducting glass was successfully synthesized using the facile hydrothermal method. The NAF photocatalysts were characterized by the scanning electron microscopy (SEM), X-ray diffraction (XRD) and UV-Vis diffuse reflectance spectra (DRS). The SEM images showed that both doped and pure NAFs exhibited a good nanorod array structure. -doped NAF still maintains rutile crystal structure, which was identical to that of pure sample. By means of the DRS measurement, it was found that the doping in nanorod could induce an obvious enhancement of visible light absorption owing to the introduction of doping energy level in the band gap of . The degradation of methyl orange (MO) demonstrated that the -doped NAF exhibited an enhanced photocatalytic activity than pure NAF under the visible light () irradiation, which should be attributed to the enhanced visible light response and improved separation efficiency of photogenerated carriers of -doped .