摘要
采用溶胶 -凝胶法制备了量子尺寸的纳米氧化钛和锡掺杂的纳米氧化钛 ,经过不同温度的热处理得到不同尺寸的粉末样品 .通过X射线衍射 (XRD)和电子衍射 (ED)表征了不同样品的物相组成和粒径 (3～ 12nm) ,通过反射谱 (RS)深入研究了纳米氧化钛的量子尺寸效应及掺杂氧化锡对于纳米氧化钛光吸收性质的影响 .实验结果表明纳米氧化钛有明显的光吸收量子尺寸效应 ,掺杂氧化锡促进了二氧化钛的锐钛矿向金红石相的转变 ,降低了相变起始温度 .由于相变和尺寸变化两方面相反的作用 。
Quantum-sized Titania and SnO2-doped Titania were prepared by Sol-Gel method. After heat treatment at different temperatures, powder samples with different sizes ( 3 similar to 12 nm) were obtained. These samples were characterized with X - ray diffraction, eletron diffraction and reflect spectrum. Experiment shows that doped SnO2 promotes the anatase -->rutile phase transformation process, and reduced the temperature of phase transition. The doped SnO2 restrain the growth of nano crystals of TiO2. Quantum-size effect of nano-Titana was observed. But shift of optical absorption edge was not so apparent when concentration of SnO2 changed. Probable reasons were discussed.
