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报告人:黄恺 加拿大多伦多大学(University of Toronto

报告题目:Exploring Dynamics at Surfaces by STM and DFT

报告时间: 3:00 PM, Jan. 7th(Saturday)

报告地点:909-B

 

摘要

The field of surface chemistry is about the detailed understanding and the control of the behaviors of atoms and molecules at surfaces. The past half century has witnessed the success of surface chemistry in studying single-crystal based “model systems”, and its wide range of high-impact applications in heterogeneous catalysis, semiconductor-based electronics, biomedical devices, photovoltaics, and petrochemical industry. Amongst a large collection of tools to study surface chemistry, “scanning probe microscopies and spectroscopies and density functional theory (DFT)” were highlighted in the 2007 report from the US Department of Energy Basic Energy Sciences Workshop as “have provided us with previously undreamt-of abilities to image surfaces and surface reactions, and to integrate theory with experiment in unraveling reaction mechanisms.” In this talk, I shall present three examples concerning dynamics at the surfaces of silicon, copper and calcium oxide by STM and DFT. The first one is concerning patterning a silicon surface by firstly molecular self-assembly, followed by thermal reaction. Two physisorbed states, termed as horizontal (h) and vertical (v), were identified of differing adsorption site, alignment, intermolecular interaction and thermal reactivity. In the second example, I shall contrast, on a copper surface, the selected reaction dynamics by tunneling electrons. The last example is concerning how the gas-phase oxygen affects the growth morphology of gold particles on a doped CaO film, forming a two-dimensional gold island at zero partial pressure of oxygen versus a three-dimensional gold deposit in 10-6 mbar oxygen.

 

简历

黄恺,(男, 19847月出生于湖北武汉),在2002-2006年期间在北京大学化学与分子工程学院接受本科教育,并于2006年获取北京大学理学学士(材料化学),在2006-2011年期间在加拿大多伦多大学师从诺贝尔化学奖得主John Polanyi教授进行博士研究生学习,并于2011年获取理学博士(物理化学)。其后,申请人先后在在德国Fritz Haber研究所Hans-Joachim Freund指导下(2012-2013), 以及在加拿大多伦多大学师从诺贝尔化学奖得主John Polanyi教授指导下(2013至今)从事博士后和助理研究员工作。申请人的研究特长为超高真空下的扫描隧道显微学(实验)以及基于第一性原理的计算模拟(理论)。其最具代表性研究成果如下:(1)对单晶硅表面原子层面上的有序图案调控;2)氧化物薄膜上的金颗粒的生长形貌调控(3)金属表面的电子诱导反应的机理。

联系人:林海平

 

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