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

• Published in: Journal of alloys and compounds Vol. 889; p. 161716
• Main Authors: Jiang, Yi, Wang, Weijing, Liang, Mingwei, Lai, Xuefei, Xie, Kenan, Liao, Li, Long, Qin
• Format: Journal Article
• Language: English
• Published: Lausanne Elsevier B.V 31.12.2021; Elsevier BV
• Subjects: 3D hierarchical porous structure; Biomass; Carbon; Cobalt; Electromagnetic interference shielding; Electromagnetic properties; Electromagnetic radiation; Electromagnetic shielding; Frequency ranges; Graphene; Graphene oxide; Graphitization; Loofahs; Magnetic properties; Magnetic shielding; Nanoparticles; Structural hierarchy; Synergistic effect; Thermal reduction; Three dimensional composites; Electromagnetic interference shielding; 3D hierarchical porous structure; Graphene oxide; Loofahs; Cobalt
• ISSN: 0925-8388; 1873-4669
• DOI: 10.1016/j.jallcom.2021.161716

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. •Unique raw material, and pollution-free process.•An alveolate conductive network with efficient ferromagnetism and conductivity.•High shielding performance in all Ku-band.•Providing a valid scheme for the optimization of biomass carbon materials.