摘要
通过对香豆素343(C343)染料敏化TiO2纳米粒子光致电子转移的荧光和拉曼光谱特性的研究表明,C343染料敏化TiO2纳米粒子稳态吸收光谱和稳态荧光光谱的红移归因于从被吸附的C343染料分子激发态和C343/TiO2复合物到TiO2纳米粒子导带的光致电子转移.由时间分辨荧光光谱确定了C343染料敏化TiO2纳米粒子的逆向电子转移速率常数为τ1=31ps.C343染料敏化TiO2纳米粒子体系拉曼光谱的研究表明,被吸附在界面处的染料分子主链碳键的伸缩振动和碳环的呼吸运动的振动模式对超快界面光致电子转移有着重要的促进作用.
The fluorescence and Raman spectroscopic characteristics of the photo-induced electron transfer of Coumarin 343 （C343） dye-sensitized TiO2 nanoparticles have been investigated. The results indicate that the red-shift of the absorption spectrum peaks and the fluorescence spectrum maxima can be attributed to the photo-induced electron transfer from the excited state of the absorbed C343 dye molecules and the charge transfer complex （C343（TiO2） to the conduction band manifold of the TiO2 nanoparticles. Back electron transfer of the system was investigated by time resolved fluorescence spectroscopy and takes place in around τ1=31 ps. Raman spectroscopy of the C343 dye-sensitized TiO2 nanoparticles reveals that the carbon bond stretching vibrations and ring breathing motions of the absorbed C343 dye molecules at the interface significantly contribute to the ultrafast interface photo- induced electron transfer.
出处
《物理化学学报》
SCIE
CAS
CSCD
北大核心
2012年第12期2953-2957,共5页
Acta Physico-Chimica Sinica
基金
国家自然科学基金(20973050
21173063
21003033)
广西自然科学青年基金(2012GXNSFBA053012)
广西教育厅科研基金(200103YB140
200807LX015)
中国工程物理研究院科学与技术发展基金(2010B0101001)
冲击波与爆轰物理重点实验室基金(9140C67130208ZS75)资助项目~~
