Spectroscopic Investigations of Interfacial Electron Transfer and Chromophore Aggregation

CHE-0202784 PI：McHale，Jeanne L.在这个由化学部实验物理化学计划资助的项目中，McHale将对界面电子转移和发色团聚集进行一系列光谱研究。共振拉曼强度分析、吸收和荧光光谱将用于研究吸附在半导体表面上的染料的激发电子态的界面电荷转移的亚皮秒动力学。将研究悬浮在水溶液和非水溶液中的胶体二氧化钛纳米颗粒上吸附的染料敏化剂的电子注入的细节。沿着电子吸收和发射光谱，共振拉曼实验也将探测染料和半导体之间电子耦合的本质。本研究涉及染料吸附在半导体表面的基本物理过程。研究成果将对染料敏化太阳能电池及相关光电化学、光伏和光催化器件的开发产生重要影响。学生将参与这项研究，并获得重要技术领域的研究技能。

CHE-0202784PI: McHale, Jeanne L.In this project funded by the Experimental Physical Chemistry Program of the Chemistry Division, McHale will conduct a series of spectroscopic investigations of interfacial electron transfer and chromophore aggregation. Resonance Raman intensity analysis and absorption and fluorescence spectroscopies will be used to investigate the sub-picosecond dynamics of interfacial charge-transfer from excited electronic states of dyes adsorbed on semiconductor surfaces. Details of the electron injection by dye sensitizers adsorbed on colloidal titanium oxide nanoparticles suspended in aqueous and non-aqueous solution will be investigated. Along with electronic absorption and emission spectroscopy, resonance Raman experiments will also probe the nature of the electronic coupling of the dye and the semiconductor.This research deals with fundamental photophysical processes of dyes adsorbed on semiconductor surfaces. The results of the work will be of interest in the development of dye-sensitized solar cells and related photoelectrochemical, photovoltaic, and photocatalytic devices.Students will participate in this research and acquire research skills in a technologically important area.