Fig. 1. Fitted XPS (a and d) C 1s and (b and e) O 1s spectra of (a and b) GO and (d and e) CrGO with hydrazine for 12 hours of reaction time and their corresponding chemical groups; (c and f) fitted ssNMR spectra of (c) GO and (f) CrGO with N2H4 for 12 hours of reaction time and their corresponding chemical groups. The stars refer to the chemical groups close to defects.
