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In order to test the success of functionalization, FTIR spectra of the functionalized graphenes were recorded. A representative FTIR spectrum of FGS is shown in Fig. 8. Besides the expected absorption peak corresponding to C-O-H at 3441 cm-1, other peaks were invariably present. In functionalized graphene sheets an additional peak observed at 2850 cm- 1 and 2924 cm-1 which are the stretching vibrations of alkane group while the presence of peak at 1483 cm-1 can be assigned to N-H stretching vibrations of amine group and 1408 cm-1 is the C-N stretching vibration. Cysteine on the graphene sheets introduced secondary amide groups as was reflected by the emergence of the characteristic secondary amine peak at about 1587 cm-1. In order to explore the crystallanity of the exfoliated graphene sheets Raman spectra of the graphene were recorded. Fig. 9 shows a typical Raman spectrum. It consists of two peaks in the range of 1500-2800 cm-1, particularly at 1580 cm-1 and 2730 cm-1. The peak at 1580 cm-1 is termed as G-peak and arises due to stretching of C-C bond in graphitic material. Fig. 9. Raman spectrum (excited by 514.532 nm laser) of exfoliated graphene sheets. Due to its high sensitivity to strain effects in sp2 system, this peak can be used to discuss disorder in graphene sheets. The G peak is quite sharp (FWHM ~15.5 cm-1). Also, it is knownPDF Image | Synthesis Graphene Electrochemical Exfoliation of Graphite
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