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Fe3O4/reduced graphene oxide (RGO) nanocomposite was synthesized by a simple hydrothermal method and then SiO2 coated onto Fe3O4 by a modified Stӧber method. The transmission electron microscopy and field emission scanning electron microscopy characterization indicate that masses of Fe3O4@SiO2 core-shell structure nanospheres attached to the RGO sheets, and that the thicknesses of SiO2 shells are...
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