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. 2017 Apr 20;15(1 Suppl):1–6. doi: 10.5301/jabfm.5000341

Fig. 3.

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).