A safe and efficient approach to fabricate black carbon-doped rutile titania by substitution of oxygen at carbon sites in titanium carbide film

摘要

Black carbon-doped rutile titania (C-doped TiO2) have been successfully fabricated by substitution of oxygen (O) at carbon (C) sites in titanium carbide (TiC), via annealing in carbon powder to control oxygen pressure around TiC film. Compared with that of substitution of C at O sites in TiO2, C-doped TiO2 fabricated by substitution of O at C sites in TiC fundamentally increase the visible-light absorption and enhances photocatalytic activity. X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS) results reveal that rutile TiO2 forms on TiC. The increased visible-light absorption and the decreased recombination between electron and hole are demonstrated by ultraviolet-visible (UV-vis) absorption and photoluminescence (PL). Black C-doped TiO2/TiC films show strong visible-light absorption, and C-doped TiO2 grow from TiC could form the heterojunction to promote the separation of electron-hole pairs.