MoS₂ Nanoflowers Decorated with Fe₃O₄/Graphite Nanosheets for Controllable Electromagnetic Wave Absorption

Flower-like MoS2-coated magnetic Fe3O4/graphite nanosheet (GNs) spheres are used to prepare Fe3O4/GNs-MoS2 composites with controllable electromagnetic (EM) wave-absorbing properties. The different particle size of Fe3O4 plays an important role in the formation of Fe3O4/GNs-MoS2. Fe3O4/GNs-1-MoS2 exhibits EM wave absorption properties with a minimum reflection loss (RLmin) value of −46.67 dB at 3.3 mm matching thickness; an effective absorption bandwidth (EAB) of 4.56 GHz can be achieved with 2.1 mm matching thickness. Meanwhile, Fe3O4/GNs-2-MoS2 exhibits excellent EM wave absorption properties with an RLmin of −55.96 dB at 2.1 mm; the EAB is 4.00 GHz at 1.5 mm with ultra-thin thickness. The superior EM wave absorption ability is related to the different morphology of Fe3O4/GNs-MoS2 and the synergistic contribution between the various loss mechanisms and good impedance matching. This work explains and proves the prospect that the enhancement of EM wave absorption performance by different microstructures can be adjusted and controlled to enhance the absorption intensity of the composites and to expand their EAB. This is a promising method for manufacturing EM wave-absorbing materials with controllability.