Facile synthesis of CoFe2O4/reduced graphene oxide nanocomposites with adjusting porous morphology for efficient microwave absorption

Abstract

Developing porous and lightweight carbon-based magnetic composites has been utilized as an effective strategy to fabricate high-performance microwave absorber. Here, CoFe2O4/reduced graphene oxide (CoFe2O4/RGO) nanocomposites with different porous structure have been synthesized using a one-step solvothermal reaction method. The crystallization, micromorphology, magnetic properties, and electromagnetic parameters can be reasonably adjusted by simply controlling the reaction temperature. CoFe2O4/RGO-200 nanocomposites exhibit a strong reflection loss (RL) of −43.0 dB at 14.4 GHz is obtained with a thin thickness of 1.8 mm. Meanwhile, an ultrabroad effective absorption bandwidth reaching 5.6 GHz (12.4–18.0 GHz) is achieved. Moreover, taking advantage of the porous microstructure, magnetic/dielectric cooperation, synergistic effect, and interfacial polarization simultaneously result in the strong absorption capability and impedance matching, which both contributing to the microwave absorption mechanisms. The superior microwave absorption performance and facile preparation method illustrate that the porous CoFe2O4/RGO nanocomposites can be applied as the efficient microwave absorber for large-scale application.