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lateral sizes of graphene [15,17,18,19]. Fig. 5 shows TEM micrograph exhibiting moire frinzes. The spacing between two broad and small bands were found to be 20.20 nm and 4.27 nm respectively. Fig. 6 is the TEM micrograph of a thick graphene block (showing moire frinzes) bringing out the existence of two spacing 4.67 nm and 9.66 nm. In order to confirm whether OH- ions are really responsible for pealing off graphene layers, FTIR spectra were recorded. Fig. 7a shows a representative FTIR spectra of exfoliated graphene sheets. This FTIR spectrum reveals the presence of various functional groups including C-O-C (at 1120 cm-1), C-H {at 1344 cm-1 and 1377 cm-1 (bending), at 2856 cm-1 (a) Fig. 7. FTIR spectrum of graphene sheets (a) and (b) pristine and after annealing at 450 oC in H2/Ar (20sccm/80sccm) atmosphere for 30 min respectively. and 2922 cm-1 (stretching)}, C=C {at 1625 cm-1 (stretching)} and C-O-H {at 3441 cm-1 (stretching)} on the graphene samples. The prominent appearance of C-O-H group clearly shows that OH- radicals did exist in conjunction with exfoliated graphene sheets. We have performed thermal annealing at 450 0C (30 min in 20% H2 and 80% Ar environment). The FTIR spectrum taken after thermal annealing is shown in Fig. 7b. It shows that the intensity of C-O-H and other functional groups decrease indicating the reduction of functional groups as a result of annealing in Ar-H2 mixture. (b)PDF Image | Synthesis Graphene Electrochemical Exfoliation of Graphite
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