Three-dimensional reduction graphene oxide (rGO) supported ScFeO3 for enhancing microwave absorption properties

Abstract

Magnetic-dielectric composites with multiple dissipation mediums are extensively applied in microwave absorption fields. However, it still remains bottleneck problem to combine magnetic and dielectric components in a rational way to achieve significant microwave absorption performance. In this study, rGO/ScFeO 3 composites were synthesized by freeze-drying and heat treatment methods. The ScFeO 3 particles decorated the rGO sheet notably improves microwave absorption performance, owing to the suitable impedance matching and abundant dissipation capabilities induced by the effective complementarities between ScFeO 3 particles and carbon sheet. These results show that the electromagnetic parameters and microwave absorption properties of rGO/ScFeO 3 composites are controlled by ScFeO 3 content. In particular, the prepared rGO/ScFeO 3 composites (content of 2%wt) exhibit the minimum reflection loss (RL min ) of −19 dB. The effective absorption bandwidth (EAB) is 4.2 GHz at thickness ranging from 3.05 to 3.55 mm. The microwave dissipation abilities probably benefit from multiple reflections and scattering, interface and dipole polarization and natural resonance effect. Therefore, the composites prepared by embedding ScFeO 3 particles into rGO can improve the microwave absorption performance. More importantly, the microwave absorption mechanism of the composites is explored and analyzed, which provides a reliable reference for the construction of magnetic dielectric composites. • The rGO/ScFeO 3 composites were synthesized by freeze-drying and heat treatment methods. • The rGO/ScFeO 3 composites possessed the magnetic-dielectric property withRL min of −19 dB. • The microwave dissipation abilities benefited from dielectric and magnetic losses.