Facile synthesis of monodisperse ultrasmall Fe3O4 nanoparticles on graphene nanosheets with excellent microwave absorption performance

The monodispersed ultrasmall Fe3O4 nanoparticles (NPs) have been anchored on reduced graphene oxide (rGO) nanosheets through a one-step method. Hybriding Fe3O4 particles with rGO sheets benefits adjusting the permittivity and permeability of the composite, balancing the dielectric loss and magnetic loss. The Fe3O4/rGO composite with a thickness of 3.0 mm exhibits an optimum absorption of − 71.86 dB at a low filler loading of 20 wt%, superior to most Fe3O4/graphene composites. The effective absorbing bandwidth covers 4.1 GHz. These results indicate that the Fe3O4/rGO composites prepared by facile synthesis can be ideal candidates as microwave absorbers with lightweight and excellent microwave absorption properties.