Flower-like bimetal-organic framework derived composites with tunable structures for high-efficiency electromagnetic wave absorption

Recently, high-performance functional composites for electromagnetic wave absorption (EWA) with tunable nano/micro-structures have attracted extensive attention. Herein, the flower-like electrically conductive and magnetic cobalt-nickel@carbon (CoNi@C) composites derived from bimetallic metal -organic frameworks (MOFs) were fabricated via solvothermal method and pyrolysis. By adjusting the ratios of different precursors, different morphological features of composites were formed. When the molar ratio of Co and Ni was 1:2, the CoNi@C composites exhibited the optimal minimum reflection loss (RLmin) of -56.89 dB at 6.7 GHz with an effective absorption bandwidth of 4.7 GHz, due to the coordinated dielectric and magnetic loss caused by the electromagnetic properties of each component as well as the interactions between the unique three-dimensional (3D) interfaces of flower-like structures that promoted the absorption and dissipation of composites for microwaves. The composites are expected to become promising candidates as high-efficiency absorbers in the electromagnetic protection field. (c) 2022 Elsevier Inc. All rights reserved.

Automated summary

In this study, flower-like electrically conductive and magnetic cobalt-nickel@carbon (CoNi@C) composites were fabricated via solvothermal method and pyrolysis, and different morphological features were formed by adjusting the ratios of different precursors. The CoNi@C composites exhibited optimal reflection loss and an effective absorption bandwidth at a specific frequency, attributed to the interactions between the components and the unique three-dimensional interfaces of the flower-like structures.