报告题目：Elucidations of Complex Interfaces Involving Polymersand Biological Molecules Using Advanced Spectroscopic Methods
报告人： Prof. Zhan Chen
University of Michigan, USA
报告时间：2018年12月14日(星期五),上午9:30-11:30
报告地点：苏州大学独墅湖校区912-1113
Abstract:
Sum frequency generation (SFG) vibrational spectroscopy is a nonlinear optical spectroscopic technique which can be used to probe molecular structures of polymers and biological molecules such as peptides and proteins at interfaces. It can be used to investigate buried solid/liquid and solid/solid interfaces in situ in real time. We have used SFG to study molecular structures of semiconducting polymers at buried solid/solid interfaces. It was found that the orientations of the semiconducting polymers at buried interfaces can be varied when the polymer side chains or substrate surfaces in contact with polymers are different. More importantly, the polymer orientation directly impacts the microelectronic device performance, e.g., the conversion efficiency of a solar cell. Our research on biological molecules showed that SFG can elucidate the molecular interactions between 2D materials and peptides or proteins. Different 2D materials such as graphene and MoS2 interact with peptides or proteins via different mechanisms. SFG has been also applied to study surface immobilized peptides. The bacterial killing effects of surface immobilized peptides were revealed.Our research demonstrated that SFG is a powerful tool to probe molecular structures of buried interfaces in situ nondestructively.
CV：
Professor Zhan Chen received his BS degree in Chemistry from Peking University, MS degree in Physics from Chinese Academy of Sciences, PhD degree in Chemistry from the University of California at Berkeley, and did his postdoctoral research in Lawrence Berkeley National Laboratory. He then worked at the University of Michigan as an assistant professor (2000-2005), an associate professor with tenure (2005-2009), and was promoted to a full professor with tenure in 2009. Currently he is a professor of chemistry, macromolecular science and engineering, biophysics and applied physics at the University of Michigan. Professor Chen received Beckman Young Investigator Award, Dow Corning Professorship, US National Science Foundation CAREER Award, and Japan Society for the Promotion of Science Invitation Fellowship. He is a senior editor of Langmuir and an associate editor-in-chief of Chinese Chemical Letters. Professor Chen is a Fellow of American Association for the Advancement of Science (AAAS) and a Fellow of Royal Society of Chemistry (RSC). Professor Chen’s research is focused on the molecular level understanding of structures of polymers and biological molecules at interfaces using nonlinear optical spectroscopic techniques. He published 270 peer reviewed research articles and gave more than 300 invited seminars.
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