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本文利用表面光电压谱(Surface Photovohage spectroscopy,简称SPS)研究了ZnTPP对TiO_2粉末的光谱敏化,发现用ZnTPP修饰后的TiO_2(金红石和锐钛矿)粉末在可见区420、550和590nm附近有三个光伏响应带,它们分别对应于ZnTPP的Soret、Q(1,0)和Q(0,0)带。经过严格的实验和分析,证明这三个带是由ZnTPP对TiO_2的敏化光电压引起的,而不是ZnTPP自身的光伏响应。在敏化效果上,亚稳的锐钛矿优于金红石。同时,我们对这种光敏表面的光诱导电荷转移机制和SPS作为一种研究光谱敏化方法的可行性进行了讨论。
In this paper, the surface sensitivities of ZnTPP to TiO 2 powders were investigated by surface photovoltage spectroscopy (SPS). It was found that the TiO 2 (rutile and anatase) powders modified with ZnTPP had three PV response bands, which correspond to the Soret, Q (1,0) and Q (0,0) bands of ZnTPP, respectively. After rigorous experiments and analysis, it is proved that these three bands are caused by ZnTPP on the sensitized photovoltage of TiO 2, not ZnTPP’s own photovoltaic response. In sensitization, metastable anatase is superior to rutile. At the same time, we discuss the light-induced charge-transfer mechanism of this kind of photosensitive surface and the feasibility of SPS as a method of studying spectral sensitization.