Synthesis of TiO 2 films on glass slides by the sol‐gel method and their photocatalytic activity

Titanium dioxide (TiO 2 ) films with rod‐like and sphere‐like TiO 2 particles were prepared on glass slides employing the sol‐gel method. The shape and size of TiO 2 particles were controlled using different concentrations of sodium dodecylbenzensulfonate (SDBS). By increasing the mole ratio of SDBS, the shape of TiO 2 particles transformed from rod‐like to sphere‐like. Also, the size of TiO 2 particles became gradually smaller. Then, the size became bigger when an excess amount of SDBS was added. The films were mainly composed of anatase titania and the relative content of anatase increased with the increasing amount of SDBS. The photocatalytic activity of the TiO 2 films that were added with SDBS was higher than that without SDBS. When the concentration of SDBS was 8.0 at%, the sample exhibited the best photocatalytic activity.