Preparation and Photocatalytic Activity of Shape- and Size-Controlled TiO<sub>2</sub> Films on Silica Glass Slides

TiO2 films consisting of rod-like to sphere-like TiO2 particles on glass slides were synthesized by assembly technique. The results showed that the shape and size of TiO2 particles could be manipulated using different concentrations of polyethylene glycol 20000. By increasing of PEG, the shapes of the TiO2 particles transformed from rod-like to sphere-like, the size of TiO2 particles became gradually smaller. The size became bigger when an excess amount of PEG was added. With the adding of PEG，the amount of the TiO2 , the hydroxyl content, and the rutile phase content on the surface of TiO2 films increased, respectively. The photocatalytic activity of TiO2 films added PEG was higher than that of unadded samples.