Heterogeneous interface engineering of high-density MOFs-derived Co nanoparticles anchored on N-doped RGO toward wide-frequency electromagnetic wave absorption

Abstract

Facing increasing electromagnetic (EM) wave pollution and interference issues, developing synergy EM wave absorption materials with rich heterogeneous interfaces is s an effective way to solve the above problems. In this work, two-dimensional (2D) cobalt-based metal-organic frameworks (Co-MOFs) nanosheets arrays are firstly growth on the 2D graphene oxide (GO) sheets. After undergoing the pyrolytic treatment in the N2 atmosphere, high-density MOFs-derived 0D Co nanoparticles (NPs) uniformly anchored on the Nitrogen-doped reduced graphene oxide (N-RGO), constructing 0D/2D magnetic-dielectric Co@N-RGO composites. By tuning the size of magnetic Co NPs by controlling the content of Co-MOFs nanosheets, the EM parameters and impedance match of Co@N-RGO sheets can be regulated to tune the EM wave absorption ability. Benefited from the synergy loss and high-density heterogeneous interfaces, obtained Co@N-RGO sheets exhibit excellent EM wave absorption intensity and tuning absorption frequency. The effective absorption bandwidth of the Co@N-RGO sheets ups to 6.0 GHz at 1.9 mm thickness, covering the entire Ku band (12–18 GHz). It can be concluded that constructing magnetic-dielectric system and high-density heterogeneous interfaces provides a new guide to obtain wide-frequency EM wave absorption materials.