Abstract
To address an increasingly serious electromagnetic radiation problem and the urgent need to develop lightweight, high-efficiency, and strong-attenuation electromagnetic wave absorbing (EMA) materials, a hollow core–shell Co/C@MoSe2 composite structure was prepared. Flower-like MoSe2 was wrapped around the surface of Co/C composites after a hydrothermal reaction. The introduction of MoSe2 and the designed hollow core–shell structure was beneficial for optimizing the electromagnetic characteristics of the composites. Owing to the magnetism of Co/C composites after high-temperature treatment, the composite materials were capable of magnetic dissipation. The introduced multiple-attenuation mechanisms, such as dielectric loss, magnetic loss, and conductive loss, contributed greatly to the incident electromagnetic wave attenuation. Among them, Co/C@MoSe2-4 exhibited excellent electromagnetic wave absorption performance. When the matching thickness was 2.5 mm, the minimum reflection loss was −42 dB, and the effective absorption bandwidth was 5.1 GHz. This work provided a smart strategy for electromagnetic wave absorbers designing and commerical application.
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