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用 Sol- Gel方法制备粒径约 1 0 - 50 nm的 Ti O2 微粒。Raman光谱测量显示 ,水解时 p H值不同 ,在同样热处理温度下得到的 Ti O2 微粒的晶体结构不尽相同。在低于 673K热处理温度下得到的 Ti O2 微粒是板钛矿和锐钛矿的混合晶体。用谱峰拟合技术可以将样品 A1的1 57cm-1 Raman谱峰分解成分属于板钛矿和锐钛矿的两个振动峰。 UV- Vis测量表明 ,锐钛矿型 Ti O2 微粒的紫外光吸收性能最好。而粒度约 2 0 μm的市售锐钛矿型 Ti O2 的紫外光吸收性能甚至比板钛矿型和金红石型 Ti O2 纳米粒子的还略低些 ,表明小尺寸效应和表面缺陷对紫外光吸收亦有贡献
Ti02 particles with a diameter of about 10-50 nm were prepared by Sol-Gel method. Raman spectroscopy showed that the p H values were different during hydrolysis, and the crystal structures of Ti O2 particles obtained at the same heat treatment temperature were different. Ti02 particles obtained at a heat treatment temperature below 673K are mixed crystals of brookite and anatase. The peak at 577 cm-1 of the sample A1 can be decomposed into two vibrational peaks belonging to brookite and anatase using the peak fitting technique. UV-Vis measurements show that anatase Ti O2 particles have the best UV absorbance. The UV absorbance of the commercially available anatase Ti O2 with a particle size of about 20 μm is even slightly lower than that of the brookite and the rutile Ti O2 nanoparticles, indicating that the small size effect and the surface defects on UV absorption Also contribute