TiO2 nanotubes with a doping of Mo by single step anodization and potential shock

초록

Anodic TiO2 nanotubes show high aspect ratio, good mechanical strength and chemical stability. However, a low conductivity and wide bandgap of 3.2eV preclude expansion of these materials to various applications. There are many studies on the modification of TiO2 nanostructures to reduce bandgap in photochemical reaction or overpotential in electrochemical applications. Herein, molybdenum oxide as a foreign catalyst was doped into TiO2 nanotubes by single step anodization and potential shock method. Then, the prepared TiO2 nanotubes were annealed at 450℃ for 1h 30min to convert TiO2 nanostructure to anatase. We investigated morphological changes of TiO2 nanotubes by scanning electron microscopy (SEM), energy ? dispersive X-ray spectroscopy (EDS) and calculated the bandgap of TiO2 nanotubes by UV-Visible spectroscopy. X-ray photoelectron spectroscopy was used to determine the doping state. Mo doped TiO2 nanotubes showed bandgap (2.3 eV) lower than that of the conventional anodic TiO2 nanotubes (3.0 ~ 3.2 eV), showing that the nanotubes can be applicable to various photocatalytic applications.