In the Fig. About Raman peaks, Stankovich and coworkers note that the changes in the processing of pristine graphite into reduced GO are evidenced by the related Raman spectra. The researchers show the spectra that we sketched in our Figure . The given description is as follow: the pristine graphite spectrum has a prominent G peak at 1581 cm -1 , coming from the first-order scattering E2g mode . The GO Raman spectrum has the G band broadened and shifted to 1594 cm -1 . The D band (1363 cm -1 ) "becomes prominent, indicating the reduction in size of the in-plane sp 2 domains, possibly due to the extensive oxidation" . The rGO Raman spectrum has G and D bands, with peaks at 1584 and 1352 cm -1 , respectively., "with an increased D/G intensity ratio compared to that in GO. This change suggests a decrease in the average size of the sp 2 domains upon reduction of the exfoliated GO (Stankovich et al. mentioning , and can be explained if new graphitic domains were created that are smaller in size to the ones present in GO before reduction, but more numerous in number" .