NiFe₂O₄ clusters on the surface of reduced graphene oxide and their excellent microwave absorption properties

Novel composites composed of NiFe₂O₄ clusters and reduced graphene oxide were synthesized by using polyethylene oxide as a structure directing reagent and the microwave absorption properties of NiFe ₂O₄ clusters-reduced graphene oxide (c-NiFe ₂O₄/RGO) were investigated. The results indicate that NiFe₂O₄ clusters with diameters in the range of 40-70 nm are composed of NiFe₂O₄ nanoparticles with diameters ranging from 3 to 5 nm. The microwave adsorption properties show that the maximum reflection loss of c-NiFe₂O₄/RGO is up to -47.3 dB at 11.9 GHz and the absorption bandwidth with the reflection loss below -10 dB is 4.7 GHz with a thickness of 2.5 mm. The excellent microwave absorption properties of c-NiFe₂O₄/RGO can be used as an attractive candidate for the new type of microwave absorptive materials.