Ujjal Kumar Sur
University of Calcutta, India
Title: Green Synthesis of highly stable aqueous dispersion of graphene using high energy gamma radiation
Biography
Biography: Ujjal Kumar Sur
Abstract
Radiation based techniques using high energy gamma and ion-beam can be utilized to synthesize different nanomaterials. The radiation based technique can provide great control over fine-tuning of the size and the size distribution of the nanoparticles by tuning the radiation dose. A stable aqueous dispersion (5 mg/mL) of graphene was synthesized using high energy gamma radiation at room temperature. Radiolytic green synthesis of aqueous dispersions of graphene using high energy ionizing gamma irradiation was carried out with a 2.59×1015 Bq 60Co source at a dose rate of 5 kGy/h under ambient conditions (normal pressure and room temperature). The as-synthesized graphene was characterized by SEM, TEM, UV-visible absorption spectroscopy, FTIR, Raman spectroscopy and X-ray diffraction study (XRD). 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. The aqueous dispersion of graphene was stable upto a period of six months.