Figure 1

SEM micrograph (A,C,E,G) and EDS (B,D,F,H) elemental profile of GQD (A,B), iron nanoparticles (C,D), Fe–Mn nanocomposites (E,F) and Fe–Mn nanocomposites doped GQD (G,H).

SEM micrograph (A,C,E,G) and EDS (B,D,F,H) elemental profile of GQD (A,B), iron nanoparticles (C,D), Fe–Mn nanocomposites (E,F) and Fe–Mn nanocomposites doped GQD (G,H).