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

Abstract

Flower-like\nMoS₂-coated magnetic Fe₃O₄/graphite\nnanosheet (GNs) spheres are used to prepare Fe₃O₄/GNs-MoS₂ composites with controllable\nelectromagnetic (EM) wave-absorbing properties. The different particle\nsize of Fe₃O₄ plays an important role in the\nformation of Fe₃O₄/GNs-MoS₂. Fe₃O₄/GNs-1-MoS₂ exhibits EM wave absorption\nproperties with a minimum reflection loss (RL_min) value\nof −46.67 dB at 3.3 mm matching thickness; an effective absorption\nbandwidth (EAB) of 4.56 GHz can be achieved with 2.1 mm matching thickness.\nMeanwhile, Fe₃O₄/GNs-2-MoS₂ exhibits\nexcellent EM wave absorption properties with an RL_min of\n−55.96 dB at 2.1 mm; the EAB is 4.00 GHz at 1.5 mm with ultra-thin\nthickness. The superior EM wave absorption ability is related to the\ndifferent morphology of Fe₃O₄/GNs-MoS₂ and the synergistic contribution between the various loss mechanisms\nand good impedance matching. This work explains and proves the prospect\nthat the enhancement of EM wave absorption performance by different\nmicrostructures can be adjusted and controlled to enhance the absorption\nintensity of the composites and to expand their EAB. This is a promising\nmethod for manufacturing EM wave-absorbing materials with controllability.