Synthesis of Hierarchical CF@Fe₃O₄ Fibers Decorated with MoS₂ Layers Forming Core-Sheath Microstructure toward Tunable and Efficient Electromagnetic Wave Absorption

Hierarchical structural design has been verified as a feasible strategy to fabricate effective electromagnetic wave (EMW) absorbers, so we designed hierarchical core-sheath composites with magnetic particles and dielectric layers. In this work, a hierarchical structure of carbon fiber (CF)@Fe₃O₄@MoS₂ (CPDF7-M) was prepared by introducing Fe₃O₄ and depositing MoS₂ layers on the surface of fibers. Due to the synergistic effects from the CF@Fe₃O₄ increasing the conductive and magnetic loss and the outer MoS₂ layers improving the impedance matching, the optimal reflection loss (R_L) value was −63.1 dB at 2.7 mm and the effective absorption bandwidth (EAB) was 9.1 GHz covering the X and Ku band. Moreover, the EAB values were adjusted with a specific MoS₂ loading at different thicknesses, which provided the necessary reference for the construction of efficient and flexible absorbers in the EMW absorption fields.