Abstract
Graphene-based films have attracted much attention as possible candidates for lightweight, wide absorption frequency, high thermal stability, and mechanically strong electromagnetic (EM) absorbers. In this study, colloidal solutions of carbon fiber (CF), Fe3O4 nanoparticles (FeNPs), and reduced graphene oxide (rGO) were used for synthesizing composite films that were first cast and then gradually heated in vacuum for thermal reduction. Compared with FeNPs/rGO film, the as-prepared CF/FeNPs/rGO film with 10 wt% CF exhibited 125% and 100% enhancement in tensile strength and EM interference shielding efficiency, respectively. A minimum reflection loss of −22.18 dB at 10.64 GHz with a matching thickness of 2.0 mm has been attained in the composite containing 50 wt% loading in the wax matrix, and the effective absorption bandwidth with reflection loss values less than −10 dB covered 9.2–12.32 GHz. The results indicated that CF can be considered as promising filler for improving the mechanical properties and microwave absorption capabilities of magnetic graphene-based system and the magnetic graphene-based composites may be used as high-performance EM absorbing materials.
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