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50 Graphene – Synthesis, Characterization, Properties and Applications Hernandez et al. also reported a small ‘D’ band in their samples, which were prepared by dispersing graphite in different organic solvents such as NMP under sonication. The Raman spectra recorded in 2650-2690 cm-1 (2D band) region for all the samples is presented in Figure 3b. We could precisely identify the number of layers from the shape and position of the 2D band. The spectra Raman spectra indicate that the sample consists of single to few layer graphene (1-5). The Raman spectra of our samples agreed well with the literature [22- 23]. The estimated yield of exfoliated graphene by Raman spectra about 90 %. Among the observed GS majority of sheets were < 5 layers. This result indicate the high yield exfoliation of graphite crystals to few layer GS under SCM conditions. 120 0 13 00 14 00 1 500 1600 170 0 18 00 2500 2 600 2 700 2 800 2 900 Raman shift(cm-1) Raman shift(cm-1) Fig. 3. Raman Spectra of D, G and 2D band region of graphene nanosheets prepared at 400 oC for 60 min reaction. Fig. 4. TEM images of exfoliated graphene nanosheets; a) mono and multi layer graphene sheets, b) portion of large graphene sheets with some mono-trilayer sheets at the left corner. D (1332) Graphene nanosheets Starting Graphite G (1581) 1 layer 2 layer 5 layer graphite Intensity (a.u) (a) (b) 200 nm 200 nmPDF Image | GRAPHENE SYNTHESIS CHARACTERIZATION PROPERTIES
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