Comparison of Few-layer Graphene Prepared from Natural Graphite through Fast Synthesis Approach  

作　　者：Iresha R.M.Kottegoda Xuanwen Gao Liyanage D.C.Nayanajith Chinthan H.Manorathne Jun Wang Jia-Zhao Wang Hua-Kun Liu Yossef Gofer 

机构地区：[1]Materials Technology Section of Industrial Technology Institute [2]Institute for Superconducting and Electronic Materials, University of Wollongong [3]Department of Chemistry, Bar Ilan University

出　　处：《Journal of Materials Science & Technology》2015年第9期907-912,共6页材料科学技术（英文版）

基　　金：provided by the Australian Research Council (ARC) Discovery Project (DP 0987805);NRC (12-022)/Treasury Grants (ITI) Sri Lanka

摘　　要：We report the synthesis of high quality few-layer graphene on a large scale using high purity natural graphite from Sri Lanka. A novel thermal method was adapted to prepare graphene from intermediate graphite oxide, which was obtained by heating the intermediate at low temperature （above 150 ℃） in air for 5 min and subsequent heating at 500℃ in Argon for 15 min. The samples were characterized by X-ray diffraction, Fourier transform infrared spectroscopy, scanning electron microscopy, Raman spec- troscopy etc. The properties and the performance of graphene were observed to depend on the graphite source. The reduced graphite oxide from Kahatagaha graphite source exhibits higher Brunauer-Emmett- Teller specific surface area -500 m^2 g^-1 and stable specific capacity as an anode in Li-ion batteries, whereas Bogala graphite showed higher initial irreversibility and higher capacity as anode, exceeding the theo- retical specific capacity of graphite. Both graphenes showed high electrical conductivity. The graphene, which exists in stacks of only a few layers, supposed to be 2-6 layers, would be promising for a vast variety of applications.We report the synthesis of high quality few-layer graphene on a large scale using high purity natural graphite from Sri Lanka. A novel thermal method was adapted to prepare graphene from intermediate graphite oxide, which was obtained by heating the intermediate at low temperature （above 150 ℃） in air for 5 min and subsequent heating at 500℃ in Argon for 15 min. The samples were characterized by X-ray diffraction, Fourier transform infrared spectroscopy, scanning electron microscopy, Raman spec- troscopy etc. The properties and the performance of graphene were observed to depend on the graphite source. The reduced graphite oxide from Kahatagaha graphite source exhibits higher Brunauer-Emmett- Teller specific surface area -500 m^2 g^-1 and stable specific capacity as an anode in Li-ion batteries, whereas Bogala graphite showed higher initial irreversibility and higher capacity as anode, exceeding the theo- retical specific capacity of graphite. Both graphenes showed high electrical conductivity. The graphene, which exists in stacks of only a few layers, supposed to be 2-6 layers, would be promising for a vast variety of applications.

关 键 词：GraphiteGraphite oxideGrapheneLi-ion batteries 

分 类 号：TQ127.11[化学工程—无机化工]