Self-Assembled Ni_0.85Se/NiSe@MoSe₂ Network with Tubular and Core–Sheath Structures toward Adjustable Electromagnetic Wave Absorption Properties

Abstract

The combination of electric and magnetic components to fabricate electromagnetic wave absorption (EWA) materials, which can simultaneously optimize impedance matching and enhance attenuation ability, has been proven to be an effective way to achieve superior EWA properties. In this work, Ni nanowires with a large length-to-diameter ratio and a wrinkled surface are fabricated through an ordinary solvothermal reaction. Afterward, via a one-pot hydrothermal reaction, Ni reacts with Se and Mo sources and is transformed into Ni 0.85 Se/NiSe, and the sheath of MoSe 2 nanosheets is depicted. Moreover, when the Ni cations migrate to the surface and react with Se, free space is formed inside the nanowires, which leads to hollow and core−sheath structures. Notably, because of the agglomeration of MoSe 2 , the synthesized Ni 0.85 Se/NiSe@MoSe 2 tubular nanowires selfassembled into a three-dimensional network. The complex can cause dielectric and magnetic loss simultaneously, achieving effective EWA in the entire X-band at 3.1 mm and the full Ku-band at 2.3 mm, respectively. By alternating the thickness of samples, effective EWA can also be realized in most parts of the C-and S-bands. This work may give enlightenment for the facile synthesis and utility of Ni nanowires and excellent EWA materials with specific structures, diversified loss approaches, and adjustable EWA properties.