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Raman spectra of the FEG (a) and MEG (b) samples, showing the main Raman features, the D, G and G’ bands, taken with a laser wavelength of 514 nm. For the sake of clarity, the spectra of the graphene samples are vertically shifted by 0.01 (Fig. 1a) and 0.3 (Fig. 1b). Inset: Representative Raman spectra of dark inclusions found in samples #6 and #7. In (a,b), the red lines are Lorentzian fits to the G’ peak.
