Fig. 3.
Scanning electron microscopy (SEM) images of reduced graphene oxide (rGO) (A) and rGO/Fe3O4 nanoparticle (F-NP) composite films with different contents of NPs: 40 mg (B), 120 mg (C) and 200 mg (D).
Scanning electron microscopy (SEM) images of reduced graphene oxide (rGO) (A) and rGO/Fe3O4 nanoparticle (F-NP) composite films with different contents of NPs: 40 mg (B), 120 mg (C) and 200 mg (D).