Excellent microwave absorption of void@carbon@TiO2 cubes by a template sol method

Polypyrrole-Coated Composites of Flower-Shaped NiCo2O4/Co3O4 Nanosheets for Microwave Absorption

“…EMW absorbers can dissipate the EMWs incident on the surface by converting them into other forms of energy through mechanisms such as magnetic loss, dielectric loss, and resistance loss. , So far, carbon materials (such as carbon nanotubes, graphene, and porous carbon), magnetic metals (nickel, cobalt, and iron), transition metal oxides (NiO, Co 3 O 4 , MnO 2 , ZnCo 2 O 4 , NiFe 2 O 4 , and NiCo 2 O 4 ), conducting polymers (including polyaniline, polypyrrole, and so on), and semiconductor materials (like SiC and ZnO) have been widely developed as candidate EMW absorbing materials. Obviously, compared with other similar materials, nickel–cobalt oxides (NiCo 2 O 4 ) have designable morphology, strong polarization ability, and conductivity due to the presence of two different metal cations in the bimetallic oxide that can provide more active sites, which is more in line with the actual needs of industry for EMW absorbers. − For example, NiCo 2 O 4 -based absorbents with nanorods, microspheres, and flower-like morphologies can be prepared by effectively adjusting the synthesis conditions.…”