Synthesis and Characterization of Titania Prepared by Using a Photoassisted Sol-Gel Method

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• 作者：Haimei Liu ; Wensheng Yang ; Ying Ma ; Yaan Cao ; Jiannian Yao ; Jing Zhang ; and Tiandou Hu
• 刊名：Langmuir
• 出版年：2003
• 出版时间：April 1, 2003
• 年：2003
• 卷：19
• 期：7
• 页码：3001 - 3005
• 全文大小：158K
• 年卷期：v.19,no.7(April 1, 2003)
• ISSN：1520-5827

文摘

Titanium dioxide nanoparticles were prepared via a photoassisted sol-gel method in which ultravioletlight irradiation was used in the preparation process of TiO₂ colloid. After characterization by X-raydiffraction, X-ray absorption near-edge structure (XANES) at the Ti K-edge, laser Raman spectroscopy,X-ray photoelectron spectroscopy, and transmission electron microscopy, it was found that the amorphoustitania nanoparticles prepared by a photoassisted sol-gel method can be transformed into crystallineanatase phase at lower calcination temperature compared to those prepared by a conventional sol-gelmethod. In addition, the particle size distribution of anatase powder samples is also affected by UVillumination on the colloid. It is suggested that UV illumination can induce the formation of oxygen vacancieson the colloid and this results in the accelerated phase transition from amorphous to anatase titania.