SPS法研究ZnTPP对TiO_2的光谱敏化

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。

A STUDY OF SPECTRAL SENSITIZATION OF TiO_2 WITH ZnTPP BY SPS

In this paper, we used surface photovoltage spectroscopy (SPS) to study the spectral sen-sitization of TiO2 powders with ZnTPP. It was found that TiO2 powders (rutile, anatase) modified by ZnTPP show three photovoltaic response bands in the visible range near 420, 550 and 590 nm, which correspond to the Soret, Q(l,0) and Q(0,0) bands of ZnTPP, respectively. These three bands were proved to be the sensitized photovoltage of TiO2 By ZnTPP, but not the photovoltaic response of ZnTPP itself. It was found that sub-stable anatase is superior to rutile in sensitizing effect. Finally, the photo-induced charge transfer mechanism and feasibility of SPS as a kind of method in studying spectral sensitization were discussed.