F-TiO_2组装微球的溶胶-微波水热合成及生长机理

Preparation and growth mechanism of self-assembled F-doped TiO_2 microspheresvia gel-microwave-assisted hydrothermal

采用溶胶-微波水热法使TiO2前驱体微球表面形成自组装介孔结构,得到F掺杂的介孔TiO2微球。利用SEM、TEM、XRD、XPS、PL对样品进行表征,并对其生长机理进行简要的分析。结果表明,微球的直径约为400nm,由于NaF的加入,纳米晶粒(12±0.5)nm和介孔(约10nm)的形成使粗糙度明显增强;F的掺杂没有引起新的萤光现象,但F的掺杂能够增加TiO2微球PL光谱的强度。PL谱表明样品在396和464nm范围内有很强的蓝光发射特性,这与样品的微观结构有很大关系。

The self-assembled mesoporous microstructures of F-doped TiO2 microspheres were synthesized via gel-microwave-assisted hydrothermal method. The as-synthesized samples were characterized by SEM, TEM, XRD, XPS and PL. The growth mechanism of F-doped TiO2 microspheres and its mesoporous microstructures was also briefly analyzed. The results showed that the average diameter of microspheres were about 400 nm. Since sodium fluoride doped, nanocrystals（（12± 0.5）nm） and mesoporous （about 10nm） formed and roughness clearly enhanced. The PL spectra show F does not result into a new PL phenomenon, but F dopant can enhance the PL intensity of TiO2 microspheres.The PL spectra showed that the as-prepared samples exhibited broad blue emission at 396 and 464nm, and its photoluminescence property was highly related to its microstructures.