AVS 63rd International Symposium & Exhibition
    2D Materials Focus Topic Wednesday Sessions
       Session 2D+TF-WeM

Paper 2D+TF-WeM2
Reduction of Graphene Oxide by a Selective Surface Modification Process via Chemical Route for Achieving Higher Proportion of Graphene

Wednesday, November 9, 2016, 8:20 am, Room 103B

Session: 2D Materials: Growth and Fabrication
Presenter: KyungHee Park, Chonnam National University, Republic of Korea
Authors: K. Dave, CSIR Centre for Cellular and Molecular Biology (CCMB), India
K.H. Park, Chonnam National University, Republic of Korea
M. Dhayal, CCMB, India
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The primary objective of the study was to target the removable of remaining oxygen available as carboxylic acid functionalities from the surface of first level of reduced graphene oxide. Hence, first we describes preparation of highly exfoliated graphene oxide (GO) from graphite which was further reduced by hydrazine and sodium borohydride. Further we used soda lime for removing carboxylic functional group from the surface of reduced GO by decarboxylation. X-ray photoelectron spectroscopic analysis confirm the synthesis of exfoliated graphene oxide by chemically introduced oxygen as -COOH), –OH and C-O-C. A very high % proportion of carbon atoms as carboxylic functionality observed in the synthesized GO whereas the reduction of it with NaBH4 and Hydrazine significantly reduced it. The use of soda lime had further reduced the carboxylic group in both the NaBH4 and N2H4 reduced GO. Raman spectroscopic analysis showed two distinct peaks of graphene oxide and reduced graphene in Raman spectra which were correlated with breathing mode of sp2 atom and graphitic carbonic sp2 of carbon atoms. A strong red shift in the G-band position was observed after oxidation of graphite into GO due to increase in the number of layers of graphene whereas the reduced GO by both reducing agent NaBH4 and N2H4 had showed a decrease in the red shift of the D-band. Above finding confirms better conversion of GO into graphene due to increased SP2 carbon proportion after selective reduction of the GO. In the future we planned to use these materials for biomedical applications.