Abstract
A stable aqueous dispersion (5 mg ml−1) of graphene was synthesized by a simple protocol based on three-step reduction of graphene oxide (GO) dispersion synthesized using the modified version of Hummers and Offeman method. Reduction of GO was carried out using sodium borohydride, hydrazine hydrate and dimethyl hydrazine as reducing agents. The chemically synthesized graphene was characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), UV–visible absorption spectroscopy, Fourier transform infrared (FTIR) and Raman spectroscopy, thermogravimetric analysis (TGA), optical microscopy. The stability of aqueous dispersions of graphene was confirmed through zeta potential measurements and the negative zeta potentials of 55–60 mV were obtained indicating the high stability of aqueous graphene dispersions.
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Acknowledgements
UKS would like to acknowledge financial support from the projects funded by the UGC, New Delhi (Grant no. PSW- 045/13-14-ERO) and UGC-DAE CSR, Kolkata Centre, Collaborative Research Schemes (UGC-DAE-CSR-KC/ CRS/13/RC11/0984/0988). UKS would also like to thank INSA, New Delhi (SP/VF-9/2014-15/273 1st April, 2014), for INSA visiting Scientist Fellowship for 2014–2015.
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SUR, U.K., SAHA, A., DATTA, A. et al. Synthesis and characterization of stable aqueous dispersions of graphene. Bull Mater Sci 39, 159–165 (2016). https://doi.org/10.1007/s12034-015-0893-0
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DOI: https://doi.org/10.1007/s12034-015-0893-0