High-Performance Microwave-Absorbing Materials Based on Bimetallic Organic Framework/Graphene Composite

Abstract

In order to enhance the performance of microwave-absorbing materials, the development of light, broad, and strong wave-absorbing solid materials has become a research focus at present. In recent years, Prussian blue analogs (PBAs), as members of MOFs, have received widespread attention as precursors for absorbing materials due to their adjustable composition and simple synthesis. We created a ZnO/ZnFe₂O₄/rGO aerogel by mixing ZnFe-PBA with a light GO aerogel using a basic carbonization and hydrothermal reaction. It has the advantage of ferrite’s high magnetic loss, while overcoming the disadvantages of its high density and narrow absorption bandwidth. The ZnO/ZnFe₂O₄/rGO aerogel is effective at absorbing waves because they have a three-dimensional network structure and interfaces made up of different types of materials. By introducing different ratios of ZnFe-PBA to GO, the electromagnetic parameters and impedance matching were modified, giving the material excellent microwave absorbing properties in the 2−40 GHz range. The lowest reflection loss (RL) of −61.6 dB with a maximum effective absorption bandwidth (EAB) of 26.78 GHz can be achieved by adjusting the absorber thickness with a filling volume of only 15 wt %. The results show that the ZnO/ZnFe₂O₄/rGO will enrich the research on MOF derivatives in microwave absorption.