Constructing flower-like core@shell MoSe2-based nanocomposites as a novel and high-efficient microwave absorber

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.

Automated summary

A high-efficiency flowerlike FeSe2@MoSe2 core@shell nanocomposite was synthesized through a simple in situ hydrothermal reaction, demonstrating optimal reflection loss values and effective frequency bandwidth for electromagnetic wave attenuation. The nanocomposite showed extraordinary absorption capabilities and broad absorption bandwidth with very thin matching thicknesses, making it a desirable candidate for high-performance microwave absorption materials.