Controllable heterogeneous interfaces and dielectric regulation of hollow raspberry-shaped Fe3O4 @rGO hybrids for high-performance electromagnetic wave absorption

Heterogeneous interface engineering is closely related to the structural design of electromagnetic ab-sorbers; thus, the interface control through structural design is a considerable approach to optimize the electromagnetic wave absorption (EWA) performance. Herein, the 3D hierarchical structure composites composed of two-dimensional reduced graphite oxide (rGO) and hollow raspberry Fe3O4 nanoparticles was successfully fabricated by a simple pyrolysis and self-assembly process. This specific structure en-riches the characteristics of interface polarization and dipole polarization, which further induces signifi-cant EWA behavior. By adjusting the amount of graphite oxide (GO), the complex dielectric constant of the obtained hybrids can be controlled, and the heterointerface can be cleverly adjusted. The minimum reflection loss (RLmin) of the typical products can be up to -73.86 dB at the thickness is only 1.35 mm, and the maximum effective absorption bandwidth (EAB) can reach 5.1 GHz. This work demonstrates that the unique structure and tunable components can fully improve the potential of electromagnetic absorp-tion performance, which provides basic guidance for the heterogeneous interface engineering of efficient electromagnetic functional materials.(c) 2023 Published by Elsevier Ltd on behalf of The editorial office of Journal of Materials Science & Technology.