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

Magnetic-dielectric composites with multiple dissipation mediums are extensively applied in microwave ab-sorption 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/ScFeO3 composites were synthesized by freeze-drying and heat treatment methods. The ScFeO3 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 ScFeO3 particles and carbon sheet. These results show that the electromagnetic parameters and microwave absorption properties of rGO/ScFeO3 composites are controlled by ScFeO3 content. In particular, the prepared rGO/ScFeO3 composites (content of 2% wt) exhibit the minimum reflection loss (RLmin) 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 ScFeO3 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.

Automated summary

In this study, rGO/ScFeO3 composites were synthesized to improve the microwave absorption performance. The results showed that the addition of ScFeO3 particles significantly enhanced the absorption performance of the composites, and this improvement was attributed to the effective complementarity between ScFeO3 particles and carbon sheet. Furthermore, it was found that the microwave absorption properties of the composites were controlled by the ScFeO3 content.