J. Mater. Sci. Technol. ›› 2015, Vol. 31 ›› Issue (9): 907-912.DOI: 10.1016/j.jmst.2015.07.014

• Orginal Article • Previous Articles     Next Articles

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

Iresha R.M. Kottegoda1, *, Xuanwen Gao2, Liyanage D.C. Nayanajith1, Chinthan H. Manorathne1, Jun Wang2, Jia-Zhao Wang2, Hua-Kun Liu2, Yossef Gofer3   

  1. 1 Materials Technology Section of Industrial Technology Institute, No. 363, BauddhalokaMawatha, Colombo 07, Sri Lanka; 2 Institute for Superconducting and Electronic Materials, University of Wollongong, NSW 2519, Australia; 3 Department of Chemistry, Bar Ilan University, Ramat-Gan, 5290002, Israel
  • Received:2014-08-25 Online:2015-09-10
  • Contact: Corresponding author. Ph.D., MPhil, BSc; Tel.: +94 112379849; Fax: +94112379800. E-mail address: iresha@iti.lk (I.R.M. Kottegoda).
  • Supported by:
    Financial support was provided by the Australian Research Council (ARC) Discovery Project (DP 0987805) and NRC (12-022)/Treasury Grants (ITI) Sri Lanka. Our Gratitude to Dr. Tania Silver for critical reading of the manuscript, Mr. Amila Jayasinghe and Dr. Feher Robert for their support for BET analysis and R.C.W. Arachchi and Dr. I.P.L. Jayaratne for their support in the preparation of the figures.

Abstract: 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?°C) in air for 5?min and subsequent heating at 500?°C in Argon for 15?min. The samples were characterized by X-ray diffraction, Fourier transform infrared spectroscopy, scanning electron microscopy, Raman spectroscopy 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?m2?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 theoretical 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.

Key words: Graphite, Graphite oxide, Graphene, Li-ion batteries