美国麻省理工大学(MIT)凌曦博士来我校进行学术交流并作学术报告，欢迎参加。

报告题目：Two-Dimensional Materials and Heterostructures: Synthesis and Spectroscopy

报 告 人：凌曦  博士

报告时间：2016年4月20日（星期三）下午15:00

报告地点：新化学楼101学术报告厅

Xi Ling obtained her PhD degree in physical chemistry from Peking University in July 2012. She worked as a postdoctoral associate in the Research Laboratory of Electronics at Massachusetts Institute of Technology (MIT) since September 2012, under the supervision of Professors Mildred Dresselhaus and Jing Kong. She has obtained an assistant professor position in Boston University. Her research interest focuses on the synthesis of two-dimensional (2D) van der Waals materials, their characterization through spectroscopy, and their implementation to develop novel nanodevices. She has published 30 articles on journals including PNAS, JACS, Adv. Mater, and Nano. Lett..

Abstract：Atomically thin two-dimensional (2D) materials, due to its ultra-flexible nature and diverse properties covering from metal (e.g. graphene), to semiconductor (e.g. MoS2) to insulator (e.g. hexagonal boron nitride), have been considered as promising candidates not only to advance the forefront of semiconductor industry, but also as the key elements for future ubiquitous electronics. For their practical application, some challenges should be solved, such as the large-area synthesis and assembly, properties study, and applications exploration. In this talk, I will first introduce the synthesis of 2D materials (e.g. MoS2) using chemical vapor deposition (CVD) method, and my recent research progress in direct assembly of diverse 2D materials into both vertically stacked and horizontally stitched heterostructures during growth process. The methodology enables the large-scale fabrication of diverse heterostructures with arbitrary patterns, and clean and precisely aligned interfaces, regardless of lattice matching between the components, which offers tremendous potential for its application in integrated circuits. In the second part of this talk, toward the properties study, I am interested in using spectroscopy techniques to reveal the physical nature of materials. Particularly, I will introduce using Raman spectroscopy to study a new member of semiconducting 2D material--black phosphorus, with properties strongly depend on the thickness and crystalline orientation. Not only spectroscopy techniques are helpful for 2D materials characterization, in the last part of the talk, I will demonstrate that 2D materials are also useful for the development of spectroscopy techniques, based on the “graphene enhanced Raman scattering (GERS)” technique developed during my PhD study.