Preparation of Polyaniline@MoS₂@Fe₃O₄ Nanowires with a Wide Band and Small Thickness toward Enhancement in Microwave Absorption

It is well-known that the absorbing property of materials is related to the microstructure and can be enhanced by magnetic nanoparticles coating. However, the mechanism is still unclear that the magnetic coating structure plays an important role in the microwave absorption behavior. Hence, a novel kind of absorber with efficient performance and relatively clear enhancement mechanism is very necessary. To solve these problems, polyaniline@MoS₂ nanowires (PANI@MoS₂ NW_S) and a series of polyaniline@MoS₂@Fe₃O₄ nanowires (PANI@MoS₂@Fe₃O₄ NW_S) with hierarchical structure were successfully prepared by in situ polymerization and versatile hydrothermal reactions and investigated in microwave absorption. The results reveal that compared with the articles related to MoS₂-based composites, the as-prepared PANI@MoS₂@Fe₃O₄ NW_S (e₂) displays the widest absorption frequency range (6.48 GHz) and strong absorption (-49.7 dB at a thickness of 1.3 mm), and the excellent MAP can be interpreted by optimizing impedance matching and simultaneously inhibiting skin effect rather than only focusing on magnetic loss.