Synthesis and Characterization of Titania and Rare Earth Doped Titania Nanoparticles by Sol-gel Process

Titania sol has been prepared by the sol-gel process with Ti（OC 4 H 9 ） 4 as precursor. TiO 2 gel was obtained through hydrolysis and condensation process. Rare earth such as La 2 O 3 , CeO 2 and Gd2O3 were introduced into the nanostructure TiO 2 . After TiO 2 and rare earth doped TiO 2 powders were calcined at 400℃, 500℃, 600℃, 700℃ and 800℃ respectively, the characteristic analyses of the TiO 2 samples were studied by UV-VIS, XRD and TEM etc. It was found that there are some stronger absorption peaks at 200-325 nm. The rare earth doping can increase the phase transition temperature converting anatase phase into rutile phase, can decrease the grain size of TiO 2 particles and can improve the anti-UV capacity of the coating fabrics.