Photochromic property of hydrous TiO<sub>2</sub> and different crystalline nano-TiO<sub>2</sub> in glycerol

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Photochromic property of hydrous TiO₂ and different crystalline nano-TiO₂ in glycerol

更新时间：2025-12-10

- Photochromic property of hydrous TiO₂ and different crystalline nano-TiO₂ in glycerol
- CIESC Journal Issue S2, Pages: 179-183(2011)
- 作者机构：
  
  四川大学材料科学与工程学院
- 作者简介：
- 基金信息：
- DOI：10.3969/j.issn.0438-1157.2011.z2.033
  CLC： 644O647
- Online First：20 December 2011，
  
  Published：20 December 2011
- 稿件说明：
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罗孜怡. Photochromic property of hydrous TiO₂ and different crystalline nano-TiO₂ in glycerol[J]. CIESC Journal, 2011, (S2): 179-183. DOI: 10.3969/j.issn.0438-1157.2011.z2.033.
DOI：

罗孜怡. Photochromic property of hydrous TiO₂ and different crystalline nano-TiO₂ in glycerol[J]. CIESC Journal, 2011, (S2): 179-183. DOI: 10.3969/j.issn.0438-1157.2011.z2.033. DOI：

摘要

系统地研究了甘油中水合TiO2及不同晶型纳米TiO2的光致变色现象。实验结果显示无定型水合TiO2具有最明显的变色行为，锐钛型纳米TiO2变色程度次之，金红石型纳米TiO2没有明显变色现象发生，混晶型(金红石和锐钛)纳米TiO2的变色程度介于金红石型和锐钛型之间。XPS结果表明TiO2的光致变色是由Ti3+引起的。从电子-空穴对复合率影响Ti 3+形成的角度对实验现象作出了详细解释，电子-空穴对复合率越高，Ti3+形成率越低，从而变色程度越浅；并运用双注入机制和小极子模型阐述了不同晶型TiO2的光致变色机理。分析了甘油环境对TiO2光致变色现象的影响，得出甘油对TiO2的光致变色行为有促进作用。

Abstract

The photochromic of nano-TiO2 with different crystals and the hydrous TiO2 in the glycerol environment were systematic studied in this paper. Experimental results showed that，amorphous TiO2（hydrous TiO2）has the most obvious discoloration，while rutile nano-TiO2 has no obvious coloration，the degree of discoloration of anatase nano-TiO2 is between rutile and amorphous，the mixed crystals（rutile and anatase）nano-TiO2 is weaker than anatase but stronger than rutile. The samples were characterized by X-ray photoelectron spectroscopy（XPS）and UV-visible（UV-vis），and the results indicated that the Ti3+ existed in the colored sample and the visible absorption spectrum of samples were significantly different before and after colored. The double-injection mechanism and the small polaron model were used to describe the photochromic mechanism of TiO2. The electron-hole recombination rate effected on the Ti3+ formation and the effects of glycerin for TiO2 photochromic phenomenon were investigated in this paper. The formation rate of Ti3+ decreased with the increasing of the electron-hole recombination rate，which leaded to the weakening of the color. The glycerin could promote the photochromic of TiO2..

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