Gas‐Supported High‐Photoactivity TiO 2 Nanotubes

By changing hydrothermal condition and post‐heat‐treatment temperature, silica‐coated TiO 2 nanotubes are obtained successfully. The effects of gas‐supported process on tubular morphology, crystallinity, and photocatalytic activity are discussed. It is found that the sample prepared at hydrothermal treatment (180°C/9 h) and calcination (650°C/2 h) shows perfect open‐ended tubular morphology and increased crystallinity. The photoactivity of the sample is proved to be 5 times higher than that of TiO 2 nanoparticles.