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Large-Scale Synthesis and Potential Applications of Graphene Materials

Speaker: 
Hui-Ming Cheng (Shenyang Nat. Lab. Mat. Sci., China)
Date: 
Wed, 21/08/2013 - 11:00am to 12:00pm
Location: 
S13-M01-11 (Physics Conference Room)
Host: 
Barbaros Özyilmaz
Event Type: 
Seminars

Abstract

There are challenges of how to realize large-scale fabrication of high-quality graphene materials and large-size single crystal graphene domains, which are essential for mass applications and device applications since grain boundaries are believed to markedly degrade the quality and properties of graphene. First, we synthesized graphene material with controlled number of layers by chemical oxidation and exfoliation, and developed a solid state intercalation-high temperature expansion-liquid phase exfoliation process for large-scale fabrication. With a proto-type production line, 5 kg/day high-quality graphene material with high electrical conductivity can be directly produced. Second, we developed an ambient pressure CVD to synthesize millimeter-size single crystal graphene grains and films on Pt substrates, and an electrochemical bubbling method to transfer these grains and films, which is also nondestructive to the Pt substrates that can be repeatedly used for graphene growth with no limit. In order to obtain graphene in a relatively large quantity, we tried to use materials with high surface area and curved surface, such as Ni particles and Ni foams, as substrates. Interestingly, with a Ni foam as template, a 3D graphene macrostructure, which is called graphene foam (GF), has been synthesized. This porous graphene bulk material consists of an interconnected network of graphene, is flexible, and has outstanding electrical and mechanical properties. And it can be used in elastic conductors, sensors flexible lithium ion batteries, and electromagnetic interference fielding materials.

Speaker's Bio: Dr. Hui-Ming Cheng is Professor and Director of Advanced Carbon Materials Division of Shenyang National Laboratory for Materials Science, Institute of Metal Research, the Chinese Academy of Sciences. He received his Ph. D degree in 1992 from the Institute of Metal Research, Chinese Academy of Sciences. He worked at Kyushu National Industrial Research Institute, AIST, and Nagasaki University in Japan from 1990 to 1993, and MIT, USA from 1997 to 1998. Dr. Cheng is mainly working on carbon nanotubes, graphene, energy storage materials, photocatalytic semiconducting materials, and high-performance bulk carbon materials. He edited the first book on carbon nanotubes in Chinese, published over 350 peer-reviewed papers on Nature, Nature Mater., Nature Commun., PNAS, Adv. Mater., JACS, Angew. Chemie, Adv. Funct. Mater., Adv. Energy Mater., ACS Nano, J. Mater. Chem., Carbon, etc, with >15,000 citations. He has received several international and national awards, including National Natural Science Award (2 class) in 2006, the Charles E. Pettinos Award (American Carbon Society, USA) in 2010, and the Prize for Scientific and Technological Progress of Ho Leung Ho Lee Foundation in 2010. He is the Editor of Carbon since 2000 and the Editor-in-Chief of New Carbon Materials since 1998. Prof. Cheng was the co-chairman of the World Conference on Carbon in 2002 (Beijing) and 2011 (Shanghai), and he has given more than 60 plenary/keynote/invited talks in international conferences and symposia. Dr. Cheng is also an honorary professor of the University of Queensland, Australia, and guest professor of a few Chinese universities.

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