accompanied by the oxygen content increased from 7.8 at. % to 8.7 at. % and C/O ratio decreased from 11.8 to 10.0 (Table ). High-resolution C 1s spectrum of EEG (Fig. ) shows the representative graphite carbon (C-C/C=C, 284.2 eV), hydroxyl (C-OH, 286 eV) and epoxy (C-O-C, 286.6 eV) groups , as well as the π-π* (289 eV) bonds correspond to the conjugated structure . High-resolution C 1s and O 1s spectra of EEA (Fig. ) suggest the appearance of C-O-Si, Si-O-Si and C-N groups. In particular, the content of C-OH decreased from 67.1% (EEG, O 1s, Table ) to 13.2% (EEA, O 1s), as a result of the For further understanding of the morphology and crystal structures, EEG and EEA flakes were characterized by Raman spectroscopy and TEM, as shown in Fig. . Raman mapping for both EEG and EEA have been undertaken with more than ten specimens tested for each sample.