Nitrogen-doped reduced graphene oxide/hollow sea urchin-like core-shell CoFe2O4 spheres as high-performance electromagnetic wave absorbers

A lightweight nitrogen-doped reduced graphite oxide (NRGO)/ CoFe2O4 composite absorber with magnetic and dielectric losses was created by a simple method combining solvothermal and hydrothermal processes. NRGO (nitrogen-doped reduced graphene oxide) is a material that possesses numerous chemical functional groups and defects. These characteristics contribute to its ability to undergo dipole polarization. Meanwhile, the CoFe2O4 material, which exhibits a unique hollow sea urchin-like structure, enhances the scattering of electromagnetic waves. When the loading is 50 %, the minimum reflection loss (RLmin) is –58.13 dB at a thickness of 3.3 mm and the maximum effective bandwidth is 6 GHz (12 GHz-18 GHz) at a thickness of 1.9 mm. The NRGO/CoFe2O4 composite developed in this study exhibits significant promise as a highly effective and lightweight absorber of electromagnetic waves.