Sandwich CoFe₂O₄/RGO/CoFe₂O₄ Nanostructures for High-Performance Electromagnetic\nAbsorption

Abstract

The\nrational design of specific nanostructures with desirable combination\nof electrical conductivity and magnetism is of significant importance\nin the field of electromagnetic absorption. To date, it is still difficult\nto uniformly coat magnetic composition on reduced graphene oxide (RGO)\nsurface, especially through a metal–organic frameworks (MOFs)\npyrolyzation strategy, just because of difficulty in even deposition\nof MOFs on graphene oxide (GO). Herein, we successfully deposit MOFs\non GO to form sandwich MOFs/GO/MOFs through the addition of Fe³⁺ to MOFs precursor. Then, we adopt a temperature-controlled\npyrolysis strategy to transform MOFs/GO/MOFs into sandwich CoFe₂O₄/RGO/CoFe₂O₄. The nanomaterial\nexhibits remarkable electromagnetic absorption (EMA) performance,\nwhere its maximum effective width reaches 7.08 GHz under 2.6 mm. It\nis thought that the synergy of electric loss, magnetic loss, and impedance\nmatch is ascribed to high-perforamnce EMA of this sandwich nanostructure.