Figure 12.

Morphological analysis of GQDs from withered leaves. TEM image of (A) ultra-small GQDs and (B) existence of GQDs in cluster form with inset showing size distribution. (C) HRTEM of a single crystalline GQD (marked in (B)) with a honey-comb-like structure of graphene with few basal/edge state-defects shown with an arrow. Inset here shows lattice spacing distance. (D) Ball and stick model indicating the defect in a typical structure of GQD with self-passivated functional groups. Reproduced from Ref. [105]. Copyright 2017 Royal Society of Chemistry.