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of the EEG products was carried out under an inert atmosphere up to 800 oC (Figure S3). The weight losses observed in the 250-400 oC range are mainly associated with the decomposition of labile oxygen functional groups and they are an indicator of the degree of oxidation. As expected, the OG and ROG samples appear to have experienced the highest and lowest degrees of oxidation, respectively. Further information about the oxygen functional groups present in these materials was acquired from the XPS and ATR-IR spectroscopic analyses. Figure 3a shows the deconvoluted XPS spectra corresponding to the C 1s peak of the EG and OG samples. They include along with the two dominant components located at ∼ 284.4 eV (C=C, sp2 hybridized carbon atoms) and at 285.3 eV (C-C, sp3 hybridized carbon atoms), three other additional peaks of lower intensity at higher binding energies which can be attributed to oxygen groups attached to the graphene layers: a peak at ∼ 286.6 eV associated to C-O groups (hydroxyl and epoxy), a peak at ∼ 288.5 eV assigned to C=O carbonyl groups and a peak at 290.6 eV that can be attributed to carboxylic O-C=O groups. As expected, in comparison with the EG particles, the dispersed OG layers exhibit a higher content in oxygen functional groups (see inset in Figure 3a). Additional evidence of the oxygen functional groups present in the EG and OG samples was obtained by means of ATR-IR spectroscopy. The spectra in Figure 3b allows several characteristic bands to be identified: at ∼ 1060 cm-1 (C-O stretching in ethers or epoxides), between 1300-1460 cm-1 (O-H bending vibrations and C-OH stretching vibrations from hydroxyl groups), at 1650 cm-1 (C=C skeletal, stretching vibrations from un- oxidized graphitic domains) and, in the case of the OG sample, at ∼ 1730 cm-1 (C=O stretching vibrations from carbonyl and carboxylic groups).[12] 8PDF Image | Graphene from Electrochemically Exfoliated Graphite
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