Fabrication, Characterization and Properties of Superparamagnetic Reduced Graphene Oxide/Fe3O4 Hollow Sphere Nanocomposites

The reduced graphene oxide wrapped Fe3O4 hollow nanospheres have been synthesized by a simple self-assembly process driven by electrostatic interaction. The structure, the chemical component and the morphology were characterized by XRD, SEM, TEM, FTIR, and Raman spectroscopy. Result show that the fabricated nanocomposites exhibit superparamagnetic property with the saturation magnetization of 70.2 A·2·kg−1 at room temperature and allow rapid separation in water solution under an external magnetic field. The high magnetism and excellent water dispersibility make the nanocomposites ideal candidates for various important applications such as magnetic resonance imaging, biosensors, communication, and microwave absorption.