Synergistic construction of three-dimensional conductive network and double heterointerface polarization via magnetic FeNi for broadband microwave absorption

The special flower-like structure based on molybdenum disulfide has attracted much attention for its physical and chemical properties and potential value in various fields. In this work, we developed a new composite in which MoS2 flowers with FeNi nanoparticles on the surface were grown on CoS2 microspheres to absorb electromagnetic waves (EMW). The special three-dimensional structure has a large specific surface area, rich defects, high electrical conductivity, numerous interfaces, and other characteristics, which make it possess excellent electromagnetic wave absorption performance. In the case of the optimized three-dimensional structure with a thickness of only 2.25 mm, the minimum reflection loss (RLmin) can reach − 46.8 dB, and the effective absorption bandwidth (EAB) can reach 6.32 GHz. It is worth noting that the effective absorption bandwidth can reach 6.96 GHz with the thickness of 2.20 mm. Our results emphasize the importance of the hierarchical three-dimensional structure composed of CoS2 core, MoS2 shell, and FeNi alloy nanoparticles for efficient EMW absorption.Graphical abstractEnhanced electromagnetic wave absorption capacities are implemented through the unique three-dimensional layered structure and synergistic effect of CoS2, MoS2, and FeNi nanoparticles.