One-pot hydrothermally prepared rGO/SiC/CoFe2O4 composites with strong microwave absorption at different thicknesses

Currently, to solve the problem of electromagnetic radiation, it is imperative to develop a thin, lightweight absorber, with a wide bandwidth and an excellent absorption ability. In this study, SiC and CoFe 2 O 4 were combined on reduced graphene oxide (rGO) with immobilized rGO and SiC nanoparticles and varying amounts of CoFe 2 O 4 nanoparticles . A facile one-pot hydrothermal technique was employed to prepare four rGO/SiC/CoFe 2 O 4 composite samples with varied CoFe 2 O 4 concentrations. The electromagnetic properties of rGO/SiC/CoFe 2 O 4 composites were affected by CoFe 2 O 4 content, and CoFe 2 O 4 content was varied to change the electromagnetic properties of composites. The rGO/SiC/CoFe 2 O 4 composite samples were prepared at a graphene oxide (GO) mass of 0.5 g, SiC mass of 0.25 g, and CoFe 2 O 4 mass of 1.5 g, and this composite sample exhibited the best microwave absorption consumption. At 60 wt% of rGO/SiC/CoFe 2 O 4 composite sample, the RL min at 7.4 GHz with a thickness of 2.43 mm was −62.39 dB, and efficient absorption of broadband (EAB) was 1.4 GHz (6.8–8.2 GHz). The EAB was 3.2 GHz (11.8–15 GHz), and the RL min was −59.77 dB at 13.2 GHz with a thickness of 1.39 mm. The RL min at 17.2 GHz was −65.49 dB, and the EAB was 2.3 GHz (15.7–18 GHz), despite a thickness of only 1.06 mm. The rGO/SiC/CoFe 2 O 4 composite comprised carbon materials, magnetic metals, and semiconductors. High-performance microwave absorption was achieved by the introduction of more than one loss mechanism and coordination and supplementation of multicomponent functions. The proposed carbon/semiconductor/magnetic composite material provides a feasible solution for the preparation of excellent microwave absorbing materials in the future.