刘云圻 - 石墨烯大会

演讲嘉宾-刘云圻

刘云圻
中科院化学所研究员

Yunqi Liu was born in 1949 in Jiangsu province, China. He graduated from the Department of Chemistry, Nanjing University in 1975, and received a doctorate from the Tokyo Institute of Technology, Japan in 1991. Presently, he is a Professor in the Institute of Chemistry, Chinese Academy of Sciences, China. His research interests cover the synthesis of molecular materials, including p-conjugated small molecules, polymers, and graphene; fabrication of related devices, including field-effect transistors and molecular electronics; and investigation of their electronic properties.

He has published over 500 peer-reviewed papers with more than 11,000 citations and an h-index of 62. He edits one book and also is co-author of 18 book chapters and co-inventor on over 60 patents. His achievements have been recognized with several awards including the 2007 National Natural Prize.

演讲题目：Controllable Growth of Single-crystal Graphene Domains by Chemistry Vapor Deposition

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The final goal for the control synthesis of graphene is to get large-size, single-crystal and monolayer (or the number of layers can be controlled) graphene. For this end, a lot of synthetic methods have been developed. Among them, chemical vapor deposition (CVD) has been recognized as a promising one since it combines high quality and large quantity of the product. A typical CVD process of graphene synthesis processes two basic stages, nucleation and growth, in which the randomly distributed graphene nuclei would continue to grow and eventually merge into film. Compared with the graphene film composed of numerous grain boundaries, single-crystal graphene domain is more important for electronic applications and could exhibit more outstanding device performance due to the absence of defects.

Here, I report the controllable synthesis of graphene by CVD and investigation of its electronic properties.[1-15] A large scale synthesis of equiangular hexagon-shaped single or multilayer graphene by methane CVD on solid Cu surface at ambient pressure. A new method of using liquid Cu as a catalyst to synthesize graphene flakes and uniform film was developed (Figure 1). The liquid characteristic of the liquid Cu allows the control of graphene nucleation due to the less grain boundary comparing to solid Cu surface, thus leads to large single-crystal graphene domains. The single-layered and single-crystalline graphene flakes with highly regular and hexagonal symmetric patterns can be grown on a liquid copper surface (Figure 2).