Preparation of Anatase TiO_2 Nanorods Sol by the Hydrothermal Treatment of Peroxotitanium Acid

Transparent anatase titanium dioxide sol was prepared by the hydrothermal treatment of the peroxotitanium acid (PTA) as precursor,PTA was synthesized by the reaction of hydrogen peroxide with the well-washed wet titania precipitates. The TiO2 nanoparticles were characterized by XRD,UV-Vis,PL,FT-Raman and TEM. It is confirmed the nanoparticles are shuttle-like and in the anatase phase with average diameter less than 10nm,most of which grow along the c-axis. The TiO2 sol shows a band-gap emission at the wavelength of 368nm. Prolonging the hydrothermal time makes TiO2 nanoparticles align and form the longer nanorods with aspect ratio more than 10 via the oriented attachment mechanism. Moreover,more stronger emission is observed in the sol prepared for a prolonged hydrothermal duration due to the formation of more longer nanorods.