摘要

We have studied the adsorption of a variety of aromatic organic molecules on TiO2 rutile (110) and anatase (101) surfaces using a combination of STM, photoemission spectroscopy, and accompanying DFT calculations performed by collaborators.
Catechol / TiO2 is a model system for dye sensitized solar cell. In this talk, I am going to talk about the adsorpion of catechol on both rutile TiO2(110) and anatase TiO2(101) surfaces. We found that the electronic structure of catecholate on TiO2 is correlated to its bonding configuration. The molecule switches back-and-forth between different configurations via facile transfer of hydrogen transfer to and from the TiO2 surface. Hydrogen also plays a key role in the diffusion of catecholates, the product via catechol adsorption, across the surface.
The adsorption of aniline (C6H5NH2) and azobenzene (C6H5N=NH5C6) has been also investigated with the goal to understand the role TiO2 plays in the catalytic synthesis of nitroaromatics.  In this talk, I will also demonstrate that both molecules form the same superstructure on rutile (110) as well as anatase (101) surfaces, suggesting that TiO2 is instrumental in cleaving the N=N double bond of azobenzene.

报告人简介

李绍春，现任南京大学物理学院教授，主要研究方向为利用扫描隧道显微镜研究表面物理和化学。1999年于北京大学物理系获得学士学位，2004年于中科院物理所获得凝聚态博士学位。2005年到2012年期间，先后在美国宾州州立大学、德州大学奥斯汀分校、杜兰大学和哈佛大学做博士后和研究助理教授。