酞菁与TiO_2超微粒间的光诱导电子转移相互作用  

Interaction between Tetrasulfophthalocyanines and Collidal TiO_2 and Interfacial Electron Transfer

作　　者：刘恺[1] 沈淑引[1] 许慧君[1] 

机构地区：[1]中国科学院感光化学研究所,北京100101

出　　处：《物理化学学报》2000年第12期1103-1109,共7页Acta Physico-Chimica Sinica

基　　金：国家自然科学基金! (29733100)

摘　　要：带有负电荷取代基的四磺化酞菁化合物与 TiO2超微粒在溶液中通过静电相互吸引 ,能够形成基态复合物 .通过吸收光谱和荧光光谱 ,计算了磺化酞菁与 TiO2在溶液中的表观缔合平衡常数 K.与相应的烷氧基取代酞菁化合物作比较 ,并通过单光子计数技术测定染料荧光寿命 .结合荧光光谱 ,证明了磺化酞菁与 TiO2在溶液中的缔合作用 ,有利于激发态酞菁染料向半导体 TiO2的导带注入电子 ,从而发生分子间的电子转移反应 .将磺化酞菁吸附在 TiO2纳晶薄膜电极上 ,进行光电性能测试 .结果表明，染料敏化 TiO2纳晶薄膜电极光电响应的大小与染料在电极表面吸附的强弱有关 .Negatively charged tetrasulfophthalocyanines adsorb strongly on the surface of colloidal TiO2 through electrostatic interaction.In comparison with tetraalkoxy phthalocyanines,the interaction between tetrasulfophthalocyanine and colloid TiO2 was probed by absorption and fluorometric spectroscopy and the apparent association constants K were calculated.Quenching of tetrasulfophthalocyanine fluorescence by colloidal TiO2 is attributed to the charge injection from the excited singlet state of tetrasulfophthalocyanine to the conduction band of TiO2.The photoinduced electron transfer process was further elucidated by fluorescence lifetime measurements using single- photon counting technique.Tetrasulfophthalocyanines were adsorbed on the surface of nanocrystalline TiO2 electrode and their photoelectric properties were measured.It is indicated that the photoelectric response is closely related to the extent of association of tetrasulfophthalocyanines on the TiO2 electrode surface.

关 键 词：酞菁 二氧化钛超微粒 有机太阳能电池 电子转移 

分 类 号：O644[理学—物理化学]