Microstructure optimization of core@shell structured MSe2/FeSe2@MoSe2 (M = Co, Ni) flower-like multicomponent nanocomposites towards high-efficiency microwave absorption

In this work, we put forward a scheme to exquisitely design and selectively synthesize the core@shell structured MSe2/FeSe2@MoSe2 (M = Co, Ni) flower-like multicomponent nanocomposites (MCNCs) through a simple two-step hydrothermal reaction on the surfaces of MFe2O4 nanospheres with the certain amounts of Mo and Se sources. With increasing the amounts of Mo and Se sources, the obtained core@shell structured MSe2/FeSe2@MoSe2 (M = Co, Ni) MCNCs with the enhanced content of MoSe2 and improved flower-like geometry morphology could be produced on a large scale. The obtained results revealed that the as-prepared samples displayed improved comprehensive microwave absorption properties (CMAPs) with the increased amounts of Mo and Se sources. The as-prepared CoSe2/FeSe2@MoSe2 and NiSe2/FeSe2@MoSe2 MCNCs with the well-defined flower-like morphology could simultaneously present the outstanding CMAPs in terms of strong absorption capability, wide absorption bandwidth, and thin matching thicknesses, which mainly originated from the conduction loss and flower-like geometry morphology. Therefore, the findings not only develop the very desirable candidates for high-performance microwave absorption materials but also pave a new way for optimizing the CMAPs through tailoring morphology engineering.