Synthesis of Phase Controlled TiO_2 Nanocrystals

摘要

Synthesis of TiO_2 nanocrystals directly from the TiO_2 micron powders by the hydrothermal method is reported for the first time. A new route of preparing amorphous TiO_2 nanopowders is demonstrated in this paper. The TiO_2 nanocrystals phase structure can be controlled by the subsequent treatment with different concentration HC1 solutions. When the amorphous TiO_2 nanopowders are treated with 0.2M HC1 aqueous solution, a spherical anatase phase nanorystals are obtained, while treated with 1 .0M HC1 aqueous solution, a rod-like rutile phase nanocrystals are formed.