文献类型：期刊文献

英文题名：Exfoliation and dispersion of graphene in ethanol-water mixtures

作者：Liu, Wei-Wei[1];Xia, Bao-Yu[1];Wang, Xiao-Xia[2];Wang, Jian-Nong[3]

机构：[1]Shanghai Jiao Tong Univ, Sch Mat Sci & Engn, Shanghai Key Lab Laser Proc & Mat Modificat, Shanghai 200240, Peoples R China;[2]Tongji Univ, Sch Mat Sci & Engn, Shanghai 200092, Peoples R China;[3]E China Univ Sci & Technol, Sch Mech & Power Engn, Key Lab Safety Sci Pressurized Syst, Minist Educ, Shanghai 200237, Peoples R China

年份：2012

卷号：6

期号：2

起止页码：176

外文期刊名：FRONTIERS OF MATERIALS SCIENCE

收录：;WOS:【SCI-EXPANDED(收录号:WOS:000208935900008)】；

基金：JNW is thankful to the research fund (Project # 50871067) from the National Natural Science Foundation of China and the National 863 Funds (2007AA05Z128 and 2009AA034400) from the Ministry of Science and Technology of China.

语种：英文

外文关键词：graphene; liquid-phase exfoliation; transparent conductive film; solubility parameter

摘要：Graphene has attracted much attention as a new nano-carbon for its unique structure and properties. However, production and dispersion of unfunctionalized graphene are still big challenges. Herein, we demonstrate a simple method for preparation and dispersion of such graphene with low cost and non toxicum. This approach is achieved by exfoliating graphite in an ethanol/water mixture and forming stable dispersion of mono-and few-layer graphenes. The ratio of ethanol/water in the mixture is found to be crucial to both the exfoliation and dispersion processes. Exfoliation in pure water or pure ethanol produces no graphene. This method avoids the conventional use of harsh oxidants and surfactants; therefore, the graphitic structure is well maintained without destruction. Benefiting from the use of ethanol and water, it can be easy to prepare transparent and conductive graphene films by vacuum filtering or spray method, and does not need special post-treatment to remove the impurity, which could be beneficial for potential applications in electronic, optic and energy areas.