Fig. 3: Characterization results of the two –NH2 functionalized GQDs.
From: Regulation of functional groups on graphene quantum dots directs selective CO2 to CH4 conversion
a and b The TEM images and HRTEM images (insets) of GQD-NH2-L (a) and GQD-NH2-H (b), respectively. Scale bar: 50 nm for the TEM in Fig. 3a, 20 nm for the TEM in Fig. 3b, and 2 nm for the HRTEM in Fig. 3a and b. c FTIR spectra of GQD-NH2-L and GQD-NH2-H, showing the existence of –NH2 functional group. d and e High-resolution N 1s (d) and C 1s (e) spectra of GQD-NH2-L and GQD-NH2-H.
