Probing the surface reactions at the atomic scale

题目:Probing the surface reactions at the atomic scale

报告人:陈伟教授(新加坡国立大学)

时间:20191027930-1030

地点:701B501



报告人简介:

陈伟,新加坡国立大学(NUS)化学系和物理系教授。于2001年在南京大学化学系获得学士学位,2004年新加坡国立大学化学系获得博士学位,2006年受聘为李光耀研究员并于新加坡国立大学物理系从事独立研究,2009年初受聘为新加坡国立大学化学系和物理系助理教授,于2013年获得终身制的副教授职位,同时兼任苏州工业园新国大研究院表界面工程中心主任,2016年被聘为新加坡国立大学院长讲席教授,2017年任化学系副系主任。研究方向包括有机、石墨烯和2D材料电子和光电子的分子级界面工程,以及用于能源和环境研究的界面控制纳米催化。在顶级科学期刊上发表了280多篇论文,引用次数超过11000次,H指数为56,并被Clarivate Analytics选为2018年高被引用研究人员。陈教授于2009年获得IPS Omicron纳米技术奖,2012年获得新加坡青年科学家奖。


报告摘要:

An atomic-scale understanding of gas adsorption mechanisms on metal-porphyrins or metal-phthalocyanines is essential for their practical application in biological processes, gas sensing and catalysis. Intensive research efforts have been devoted to the study of coordinative bonding with relatively active small molecules, such as CO, NO, NH3, O2 and H2. However, the binding of single nitrogen atoms has never been addressed, which is both of fundamental interest and indeed essential for revealing the elementary chemical binding mechanism in nitrogen reduction processes. Here, we present a simple model system to investigate, at the single-molecule level, the binding of activated nitrogen species on the single Mn atom contained within the manganese phthalocyanine (MnPc) molecule supported on an inert graphite surface. Through the combination of in situ low-temperature scanning tunneling microscopy, scanning tunneling spectroscopy, ultraviolet photoelectron spectroscopy, x-ray photoelectron spectroscopy and density functional theory calculations, the active site and the binding configuration between the activated nitrogen species (neutral nitrogen atom) and the Mn center of MnPc is investigated at the atomic scale.


                                                  (报告联系人:郑军伟老师课题组)