物理化学学报 >> 2000, Vol. 16 >> Issue (12): 1103-1109.doi: 10.3866/PKU.WHXB20001208

研究论文 上一篇    下一篇

酞菁与TiO2微粒间的光诱导电子转移相互作用

刘恺, 沈淑引, 许慧君   

  1. 中国科学院感光化学研究所 北京 100101
  • 收稿日期:2000-07-06 修回日期:2000-09-12 发布日期:2000-12-15
  • 通讯作者: 许慧君 E-mail:g201@ipc.ac.cn

Interaction between Tetrasulfophthalocyanines and Collidal TiO2 andInterfacial Electron Transfer

Liu Kai, Shen Shu-Yin, Xu Hui-Jun   

  1. Institute of Photofraphic Chemistry,The Chinese Academy of Science,Beijing 100101
  • Received:2000-07-06 Revised:2000-09-12 Published:2000-12-15
  • Contact: Xu Hui-Jun E-mail:g201@ipc.ac.cn

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在溶液中的表现缔合平衡常数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。

关键词: 四磺化酞菁化合物, TiO2超微粒, 电子转移反应

Abstract:

Negatively charged tetrasulfophthaloeyanines adsorb strongly on the surface of colloidal TiO2 through electrostatic interaction.In comparison with tetraalkoxy phthalocyanines,the interaction between tetrasulfophthaloeyanine and colloid TiO2 was probed by absorption and fluorometric spectroscopy and the apparent association constants K were calculated.Quenching of tetrasulfophthaloeyanine fluorescence by colloidal TiO2 is attributed to the charge injection from the excited singlet stste of tetrasulfophthaloeyanine to the conduction band of TiO2.The photoinduced electron transfer process was further elucidated by fluorescence lifetime measurements using single-photon counting technique.Tetrasulfopthalocyanines 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.

Key words: Tetrasulfophthalocyanine, Colloidal TiO2, Electron transfer reaction