Design of Molybdenum Disulfide-Based FeCoNi Ternary Alloy Nanocomposite toward Low-Frequency Microwave Absorption

Ion-intercalated MoS2 can enhance its electrochemical activity, electrical conductivity, and stability, which can be combined with other materials to meet specific application requirements, such as the fields of electrochemistry and microwave absorption. This study explored the modulation of electromagnetic characteristics of ion-intercalated MoS2-based ternary FeCoNi alloy nanocomposites, in which MoS2 provides more contact sites for an electromagnetic wave, and the heterogeneous interfaces formed by the heterogeneous structure can improve the stronger interface polarization to enhance the dielectric loss. In addition, by inserting nano-FeCoNi alloy particles into the interlayers of MoS2, the FeCoNi alloy also enhanced the magnetic loss capabilities, in which the impedance matching of FeCoNi/MoS2 composites was also regulated. The results show that the FeCoNi/MoS2 composite achieved a minimum RL (RLmin) value of −54.73 dB at 4.20 GHz with a matching thickness of 3.29 mm, and the effective absorption bandwidth (EAB) was 4.72 GHz at a thickness of 1.32 mm. In addition, the radar cross section (RCS) and COMSOL simulation results verify the possibility of application. The study revealed the microwave loss mechanisms of the FeCoNi/MoS2 heterostructured composites, providing insights for designing novel low-frequency absorbing materials.