Safe and Low Cost Synthesis of Large Area and
High Quality Graphene Films
报告人: Prof. Xuesong Li
School of Microelectronics and Solid State Electronics
University of Electronic Science and Technology of China
时 间：2015年12月12日(星期六) 15:30
Graphene has been attracting great interests because of its many remarkable properties and promising applications. In the past 11 years, a lot of application prototypes have been promoted and demonstrated. Graphene was firstly achieved by mechanical exfoliation (scotch tape method) in the lab, which providing micro flakes, though tiny size but good enough for most fundamental research. Nevertheless, large area with high quality is demanded for both mass production and many applications. Various methods have been pursued for large area graphene production and chemical vapor deposition (CVD) of hydrocarbons (typically methane) on copper foil substrate has been proven the most effective one, which is widely used in both academy and industry today. Theoretically, the area of graphene can be as large as possible as long as large copper foil and reaction chamber are used. However, in practice, though large copper foil is commercially available, reaction chamber is not. With the increase of reaction chamber size, the cost and difficulty to make the equipment increase dramatically. This talk will introduce a method to overcome the limit of reaction chamber dimensions so as to synthesize large area graphene film with the use of small chamber, evidenced with the successful growth of a large area graphene up to 300 inch with the use of a 5 inch diameter quartz tube chamber. Another issue for the current CVD technique for graphene synthesis is the use of hydrocarbon and hydrogen gases, which are flammable and explosive and thus dangerous and cost for safety concern added. Here a new technique will also be introduced by using a non-flammable gas instead. In this talk, factors affecting graphene quality and some solutions to overcome these issues will also be discussed.
Dr. Xuesong Li got his B.S. and M.S. from Tsinghua University in 2000 and 2003, respectively and his Ph.D. from Rensselaer Polytechnic Institute in US in 2007. From May 2007 to Jan. 2012 Dr. Li pursued his post doctorate research in UT Austin and IBM T. J. Watson Research Center, respectively. In Feb. 2012, Dr. Li, together with his colleagues, co-founded Bluestone Global Tech, a company on graphene commercialization, and then LasLumin LLC in Jun. 2014. In July 2015 Dr. Li joined UESTC as a full professor with the 1000 young talent plan. Dr. Li’s research interests are synthesis and applications of carbon nanomaterials such as carbon nanotubes and graphene. He has published 45 papers in peer reviewed journals such as Science, Nature Nanotechnology, Nature Materials, Nature Photonics, etc. with total citations over 14000. His research work has been widely reported by multi-media such as BBC news, Nature, ScienceDaily, C&EN, etc. His work on graphene synthesis by chemical vapor deposition of methane on copper foil substrate, which was published in Science in 2009, was selected as one of the breakthroughs in 2009 by Science and has been cited over 5000 times. This invention has been widely used in both academy and industry up to date for graphene film production.