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Fig. 1. (a) Schematic illustration of the electrochemical exfoliation setup. Optical images of (b) graphite foil before exfoliation (c) graphite foil after exfoliation (d) graphene sheets floating on the surface of electrolyte and (e) dispersed graphene sheets in DMF solution. solution. After sometime, it was observed that one type of sheets settle down in the bottom of the electrolysis cell. Presumably, these are multilayer graphene with large thickness. To address the problem of thickness and also to reduce the functionalities of graphitic sheets alternating bias voltages (+10V and -10V) were applied until desired amount of graphitic sheets were obtained. The polarity of voltage changed after every 5 sec. On applying the alternating voltages, it was found that most of the graphitic sheets float on the surface of electrolyte (Fig. 1d). Fig. 1b and c are respectively the optical images of graphite foil before and after exfoliation. Further the vacuum filtration technique was applied to filter the graphene sheets. In order to remove the residual products, filtered graphitic sheets were washed repeatedly with distilled water. The powder then obtained was dispersed in DMF solution by ultrasonication for 20 min, to get exfoliated graphene sheets (Fig. 1e). ThePDF Image | Synthesis Graphene Electrochemical Exfoliation of Graphite
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