影像科学与光化学 ›› 1996, Vol. 14 ›› Issue (2): 127-131.DOI: 10.7517/j.issn.1674-0475.1996.02.127

• 研究论文 • 上一篇    下一篇

菁染料在TiO2胶体表面光诱导的电子转移

陈次平, 齐晓燕, 周本茂   

  1. 中国科学院感光化学研究所, 北京 100101
  • 收稿日期:1995-09-06 修回日期:1996-01-11 出版日期:1996-05-20 发布日期:1996-05-20
  • 通讯作者: 陈次平
  • 基金资助:
    国家自然科学基金

PHOTOINDUCED ELECTRON TRANSFER ON COLLOIDAL TiO2 SURFACE FROM CYANINE DYE

CHEN Ciping, QI Xiaoyan, ZHOU Benmao   

  1. Institute of Photographic Chemistry, The Chinese Academy of Sciences, Beijing 100101, P. R. China
  • Received:1995-09-06 Revised:1996-01-11 Online:1996-05-20 Published:1996-05-20

摘要: 本文用紫外-可见光谱及荧光光谱研究了吸附在TiO2胶体表面上的染料1,1'-二乙基-3,3'-二磺丁基-5,5'-二氰基咪碳菁与胶体间发生的光诱导电子转移过程。荧光实验表明,菁染料荧光发射强度随着体系中TiO2胶体浓度的增加而降低,这是由于电子从染料的激发单重态注入到TiO2的导带所致。通过染料荧光寿命的测定得到光诱导电子转移速率常数Ket约为4×108s-1

关键词: 菁染料, 二氧化钛胶体, 荧光, 电子转移

Abstract: Ultraviolet-visual absorption spectra and fluorescence emission spectra were applied to investigation of Photoinduced electron transfer on colloidal TiO2 surface from adsorbed anhydro-1,1'-diethyl-3,3'-disulfobuty1-5,5'-dicyanimidazolo carbocyanine hydroxide. The fluorescence spectra indicate that the intensity of fluorescence emission of dye decreases continuously with increasing concentration of TiO2 Collolid in the system. This is due to electron injection into the conduction band of TiO2 from the singlet state of dye.The rate constant of electron transfer Ket(4×108s-1) was obtained by fluorescence lifetime measurements.

Key words: cyanine dye, titanium dioxide colloid, fluorescence, electron transfer