Impedance-matching regulation strategy for hydrangea-like FeNi@NC@MoS2 multicomponent composites enables efficient electromagnetic wave absorption

To achieve excellent absorptive properties in composite materials, adjusting the dielectric constant to achieve impedance matching is a sound strategy. Firstly, Prussian blue analogues (FeNi-PBAs) was used as the precursor, coated with dopamine (DA) and carbonized at high temperature to obtain FeNi@NC (FN@C), and then different masses of Molybdenum disulfide (MoS 2 ) nanosheets were loaded on its surface by hydrothermal method to obtain FN@M-X series samples. The FN@M-2 achieves a minimum reflection loss ( RL min ) of -54.3 dB and a radar cross section (RCS) attenuation value of 25.56 dB m −2 . Its outstanding performance stems from the synergistic interaction between MoS 2 and FN@C: the hydrangea-like structure enlarges the effective interfacial area for polarization and prolongs the internal propagation path, enriches the heterojunction interface, while simultaneously incorporating magnetic loss mechanisms. This provides new insights for the design and preparation of EMW absorbing materials.