Effects of Surface Oxygen Vacancies on Photophysical and Photochemical Processes of Zn-Doped TiO2 Nanoparticles and Their Relationships

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• 作者：Liqiang Jing ; Baifu Xin ; Fulong Yuan ; Lianpeng Xue ; Baiqi Wang ; Honggang Fu
• 刊名：Journal of Physical Chemistry B
• 出版年：2006
• 出版时间：September 14, 2006
• 年：2006
• 卷：110
• 期：36
• 页码：17860 - 17865
• 全文大小：96K
• 年卷期：v.110,no.36(September 14, 2006)
• ISSN：1520-5207

文摘

In this paper, TiO₂ nanoparticles doped with different amounts of Zn were prepared by a sol-gel method andwere mainly characterized by means of X-ray photoelectron spectroscopy (XPS), photoluminescence (PL),and surface photovoltage spectrum (SPS). The effects of surface oxygen vacancies (SOVs) of Zn-doped TiO₂nanoparticles on photophysical and photocatalytic processes were investigated along with their inherentrelationships. The results show that the SOVs easily bind photoinduced electrons to further give rise to PLsignals. The SOVs can result in an interesting sub-band SPS response near the band edge in the TiO₂ sampleconsisting of much anatase and little rutile, except for an obvious band-to-band SPS response. Moreover, theintensities of PL and SPS signals of TiO₂, as well as the photocatalytic activity for degrading phenol solution,can be enhanced by doping an appropriate amount of Zn. These improvements are mainly attributed to theincrease in the SOV amount. It can be suggested that the SOVs should play an important role during theprocesses of PL, surface photovoltage, and photocatalytic reactions, and, for the as-prepared TiO₂ samplesdoped with different amounts of Zn by thermal treatment at 550 C, the larger the SOV amount, the strongerthe PL and SPS signal, and the higher the photocatalytic activity.