Photoluminescence characteristics of TiO2 and their relationship to the photoassisted reaction of water/methanol mixture
Photoluminescence characteristics of TiO2 and their relationship to the photoassisted reaction of water/methanol mixture
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DOI：
10.1021/jp065744z
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发表时间：
2007-01-18
影响因子：
3.7
通讯作者：
Li, Can
中科院分区：
文献类型：
--
作者：
Shi, Jianying;Chen, Jun;Li, Can
研究了TiO 2的光致发光特性，并讨论了TiO 2的光致发光特性与水/甲醇混合物光助反应的关系。结果表明，金红石型TiO 2在505 nm附近有一个可见光发光带，而金红石型TiO 2主要在835 nm附近有一个近红外发光带，这分别归因于金红石型TiO 2中的氧空位和金红石型TiO 2中的本征缺陷。可见光发射带容易被沉积在TiO 2表面的Pt猝灭，而近红外发射带几乎不受沉积Pt的影响。结果表明，被束缚在金红石氧空位中的激发态电子很容易转移到Pt上，而被束缚在金红石本征缺陷中的激发态电子则不易转移到Pt上，从而有助于光助反应的进行.
This work investigated the photoluminescence characteristics of TiO2 and discussed the relationship between the photoluminescence features of TiO2 and the photoassisted reaction of water/methanol mixture. It is found that anatase TiO2 displays a visible luminescence band centered at about 505 nm and rutile TiO2 mainly shows a near-infrared luminescence band centered at about 835 nm, which are respectively ascribed to the oxygen vacancies in anatase TiO2 and the intrinsic defects in rutile TiO2. The visible luminescence band is easily quenched by the Pt deposited on the surface of TiO2, while the near-infrared luminescence band is hardly influenced by the deposited Pt. It is suggested that the excited electrons trapped in the oxygen vacancies of anatase are facilely transferred to Pt to contribute to the photoassisted reaction, but the electrons trapped in the intrinsic defects of rutile are not.