From core@shell ZnSe/FeSe2@MoSe2 to core@shell@shell magnetic ZnFe2O4@C@MoSe2 flower-like nanocomposites: An effective strategy to boost microwave absorption performance of MoSe2-based nanocomposites

The selenylation/sulfuration of magnetic precursor brings about the great challenges to construct magnetic transition metal dichalcogenides (TMDs)-based multicomponent nanocomposites (MCNCs), which greatly hinders the improvements in magnetic loss ability and impedance matching characteristic. Theoretically speaking, the addition of carbon layer is conducive to protect the magnetic nanoparticles, optimize the impedance matching, strengthen the interfacial polarization and magnetic loss abilities, and so on. In order to verify these ideas, herein, we elaborately designed and produced core@shell ZnSe/FeSe2@MoSe2 and core@shell@shell ZnFe2O4@C@MoSe2 flower-like MCNCs. The results of comparative study indicated that the as-prepared ZnSe/FeSe2@MoSe2 and ZnFe2O4@C@MoSe2 with the different MoSe2 contents and flower-like geometrical morphologies could be synthesized by regulating the amounts of Mo and Se sources. And the introduction of carbon layer not only effectively inhibited the selenylation of ZnFe2O4 precursor, but also greatly improved the impedance matching characteristic, dielectric and magnetic loss capabilities. The obtained ZnFe2O4@C@MoSe2 MCNCs presented the excellent comprehensive microwave absorption properties (MAPs) including strong absorption capability, broad frequency bandwidth and thin matching thickness. Therefore, our findings not only presented a simple and viable route to produce magnetic TMDs-based MCNCs, but also provided an effective strategy to boost their comprehensive MAPs.