Constructing flower-like core@shell MoSe_2-based nanocomposites as a novel and high-efficient microwave absorber

摘要

To effectively utilize the unique properties of layered transition metal dichalcogenide and the attractive morphology of hierarchical flower for the attenuation of electromagnetic wave, herein, high-efficiency flowerlike core@shell structure FeSe2@MoSe2 nanocomposites were firstly synthesized through a simple in situ hydrothermal reaction on the surfaces of Fe3O4 nanoparticles with the adequate amounts of Mo and Se sources. The obtained results indicated that the designed flower-like core@shell structure FeSe2@MoSe2 nanocomposites with the filler loadings of 30 wt% and 40 wt% presented the optimal reflection loss (RLopt) value of -59.87 dB at 11 GHz with a matching thickness of 3.10 mm and -60.53 dB at 13.52 GHz with a matching thickness of 2.47 mm. And their corresponding effective frequency bandwidth (fb) values were up to 10.0 GHz with a thickness of 3.66 mm and 6.00 GHz with a thickness of 2.12 mm, respectively. It was worth pointing out that the as-prepared flower-like FeSe2@MoSe2 nanocomposite with filler loading of 30 wt% could simultaneously present very extraordinary electromagnetic wave absorption capabilities and broad absorption bandwidth with the very thin matching thicknesses, which was desirable for high-efficient microwave absorbers. Therefore, a simple and effective strategy was proposed to produce flower-like core@shell structure MoSe2-based nanocomposites, which could be applied as the very desirable candidates for high-performance microwave absorption materials.