Preparation of hierarchical core-shell C@NiCo2O4@Fe3O4 composites for enhanced microwave absorption performance

Controlling the electric permittivity of honeycomb-like core–shell Ni/CuSiO3 composite nanospheres to enhance microwave absorption properties

“…These absorbers are of great interest for electric and electronic devices, and in military and industrial applications. [1][2][3][4][5] Ferromagnetic materials are the most promising candidates for EM absorbers because of their high EM loss efficiency. [1][2][3] Notably, nickel (Ni)-based absorbers are easy to prepare and display high permeability in the GHz range.…”

“…[1][2][3][4][5] Ferromagnetic materials are the most promising candidates for EM absorbers because of their high EM loss efficiency. [1][2][3] Notably, nickel (Ni)-based absorbers are easy to prepare and display high permeability in the GHz range. [6][7][8][9] However, severe eddy current loss in the GHz range caused by high conductivity results in impedance mismatch between the material and air space, which decreases microwave absorption performance.…”

Electromagnetic wave absorption performance of Ni doped Cu-ferrite nanocrystals

“…Nickel ferrites (NiFe 2 O 4 ) as a well-known form of magnetic ferrites shows the unique characteristics of well chemical stability, modest saturation magnetization, and low cost, therefore it has potential applications in the field of EM wave absorption [22][23][24]. Wei et al synthesized hierarchical carbon@cobalt acid nickel@ferriferrous oxide composites by a simple one-step hydrothermal and co-deposition route [25]. The hybrid and unique void space leads to the efficient dielectric and magnetic loss resulting to increase EM wave absorption properties of the material, with a thickness of 3.4 mm and the lowest value of R L was achieved −43.0 dB at 13.4 GHz.…”

Enhanced electromagnetic wave absorption of Fe‐doped silicon oxycarbide nanocomposites

“…9,10 Several categories of dielectric materials, such as graphene, [11][12][13][14] carbon nanotubes (CNTs), [15][16][17][18][19] and conducting polymers 20,21 can be considered as an excellent absorption material for the sake of large dielectric loss tangent. Specifically, Fe-Ni alloy, 1,[22][23][24] TiO 2 -Fe nanocomposites, 25 and Fe 3 O 4 9,26 have been widely investigated to enhance the magnitude of absorption performance because of their high magnetic loss tangent. Unfortunately, the dielectric materials always suffer from a low relative permeability µ r (=µ′ − µ″).…”