光致电子转移对Alizarin敏化TiO_2纳米粒子Raman光谱特性的影响  

Influence of Photoinduced Electron Transfer on Raman Spectroscopic Characteristic of Alizarin Dye-sensitized TiO_2 Nanoparticles

作　　者：蒋礼林[1] 

机构地区：[1]贺州学院机械与电子工程学院,广西贺州542800

出　　处：《光子学报》2014年第2期169-172,共4页Acta Photonica Sinica

基　　金：国家自然科学基金(Nos.21003033;21203047);广西自然科学青年基金(No.2012GXNSFBA053012);广西教育厅科研基金(No.200103YB140)资助

摘　　要：结合理论和实验研究了茜素Alizarin(Alz)染料敏化TiO2纳米粒子体系的光致电子转移对Alz Raman光谱特性的影响.结果表明:Alz染料敏化TiO2纳米粒子吸收光谱的红移和荧光光谱的淬灭归因于从被吸附的Alz染料分子激发态和电荷转移复合物(Alz/TiO2)到TiO2纳米粒子导带的光致电子转移;超快光致界面电子的转移有效地增强了被吸附在界面处Alz染料分子的C=C键伸展振动、C=O羧基伸展振动和C-O键伸展振动.Effects of photoinduced electron transfer on the Raman spectroscopy of Alizarin （Alz） dye sensitized TiO2 nanoparticles were investigated by theoretical and experitmental methods. The results indicate that re＆shift of absorption spectra and quenching of the fluorescence spectra are attributed to the photo-induced electron transfers from the excited state of the absorbed Alz dye molecules and the charge transfer complex （Alz/TiO2） to the conduction band manifold of the TiO2 nanoparticles. The resonance Raman spectroscopy of the Alz dye-sensitized TiO2 nanoparticles reveals that the ultrafast photoinduced interface electron transfer significantly enhances the C= C, C-O, and C= O bond stretching vibrations of the absorbed Alz dye molecule at the interface.

关 键 词：Alz染料 TIO2纳米粒子 光致电子转移 RAMAN光谱 吸收光谱 荧光光谱 激发态 导带 伸展振动 

分 类 号：O649[理学—物理化学]