Optimized electromagnetic wave absorption of α-Fe2O3@MoS2nanocomposites with core-shell structure

Abstract

Core-shell structures and interfacial polarization are of great significance to meet the diversified requirements of microwave attenuation. Herein,α-Fe₂O₃@MoS₂nanocomposites are fabricated via a simple two-step hydrothermal process, in which MoS₂nanosheets as the shell are self-assembled andα-Fe₂O₃microdrums are used as the core to constitute a special flower-like morphology with core-shell structure. This structure can provide more interface contact to achieve strong interfacial polarization and possibly offer more multiple reflection and scattering of electromagnetic waves. Furthermore, the microwave dissipation performances ofα-Fe₂O₃@MoS₂nanocomposites can be significantly improved through construction of core-shell structure and flower-like morphology, controlling the content ofα-Fe₂O₃microdrums and adjusting the filler loading ratios. This work proves that the as-synthesized nanocomposites achieve excellent effective absorption bandwidth and outstanding electromagnetic wave absorption capabilities due to their special interfaces, core-shell structures and good impedance matching conditions. Therefore,α-Fe₂O₃@MoS₂nanocomposites are expected to be a novel and desirable candidate for high-performance electromagnetic wave absorbers.

Keywords: core–shell structures; effective absorption bandwidth; electromagnetic wave; α-Fe2O3 microdrums.