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    • Keywords

       

      Graphene; zeta potential; graphene oxide; graphite; dispersion; Raman spectroscopy.

    • 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.

    • Author Affiliations

       

      Ujjal Kumar Sur1 Abhijit Saha2 Aparna Datta2 Balaprasad Ankamwar3 Farah Surti3 Sannak Dutta Roy4 Debasish Roy5

      1. Department of Chemistry, Behala College, Parnashree, University of Calcutta, Kolkata 700 060, India
      2. UGC-DAE Consortium for Scientific Research, Kolkata Centre, III/LB-8 Bidhannagar, Kolkata 700 098, India
      3. Bio-Inspired Materials Science Laboratory, Department of Chemistry, University of Pune, Ganeshkhind, Pune 411 007, India
      4. Department of Physics, Sammilani Mahavidyalaya, E.M. Bypass, Baghajatin Station, University of Calcutta, Kolkata 700 075, India
      5. Department of Zoology, Sammilani Mahavidyalaya, E.M. Bypass, Baghajatin Station, University of Calcutta, Kolkata 700 075, India
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