3D hierarchical porous composites based on natural loofahs/cobalt nanoparticles/graphene oxide with efficient electromagnetic interference shielding performance

Using biomass carbon materials to construct the electromagnetic wave shielding system is an efficient solution for electromagnetic interference pollution. In this study, carbonized loofahs/Co nanoparticles/ graphene oxide composites were prepared with a 3D hierarchical porous structure for efficient electromagnetic interference shielding by a facile and efficient thermal reduction process. The carbon matrix is inlaid with cobalt nanoparticles, promoting the graphitization of composites and the fabrication of a 3D conductive network. Simultaneously, the synergistic effect between nanoparticles and carbon matrix good electromagnetic properties, inducing the improvement in both dielectric and magnetic loss. As a result, the average shielding effectiveness and specific shielding effectiveness of composites reach 61.05 dB and 714.76 dB cm3/g within the frequency range of 12.4-18 GHz (Ku-band) separately, whose intense absorption loss and wideband response are superior to other composites based on biomass carbon. It is believed that this work may promote the application of biomass material in the field of electromagnetic shielding. (c) 2021 Elsevier B.V. All rights reserved.

Automated summary

The study utilized biomass carbon materials to construct an efficient electromagnetic wave shielding system, preparing carbonized loofahs/Co nanoparticles/graphene oxide composites with a 3D hierarchical porous structure through a thermal reduction process. The composites exhibited excellent electromagnetic interference shielding performance in the Ku-band frequency range, with improved dielectric and magnetic loss properties. This work may advance the application of biomass materials in the field of electromagnetic shielding.