Preparation of rGO@Fe3O4 nanocomposite and its application to enhance the thermal conductivity of epoxy resin

In this study, we report a simple method to improve the thermal conductivity of epoxy resin by using new magnetic composites as fillers. The rGO@Fe3O4 nanocomposite has been prepared by a solvothermal method, and its morphology and chemical structure were characterized and analyzed by various characterization methods. Afterwards, the rGO@Fe3O4/EP composite material was obtained in an external magnetic field, in which the rGO@Fe3O4 is uniformly dispersed in the epoxy resin matrix, arranged along the direction of the magnetic field. In addition, the orientation of rGO@Fe3O4 increases with the magnetic field intensity. After doping 30% (wt) rGO@Fe3O4 into epoxy resin and curing under a 500 Gs magnetic field, the rGO@Fe3O4/EP composite material is anisotropic and has a higher thermal conductivity (increased by 196.60%) parallel to the direction of the magnetic field compared to a pure ring oxygen resin.