Bimetallic Metal–Organic Framework-Derived ZnO/Co@Porous Carbon with Tunable Components and Heterostructure for Ultrawide Dual-Band Electromagnetic Wave Absorption
Zhe Zhang, Jiewu Cui, Yunfei Wu, Yunfei Wu, Dongbo Yu, Jiaqin Liu, Pengjie Zhang, Yong Zhang, Jiaheng Wang, Song Ma, Yucheng Wu, Yucheng Wu
Abstract
The design of high-performance electromagnetic wave (EMW) absorbers utilizing metal–organic framework (MOF) derivatives has garnered significant attention. However, enabling it to implement dual-band EMW absorption (EMWA) with a sole material remains a substantial challenge. Herein, we devise a strategy involving bimetallic Zn/Co-MOF precursors and realize the modulation of their micro–nanostructure via altering the molar ratio of Zn/Co. ZnO/Co@porous carbon (PC) composites are successfully fabricated via pyrolysis with advanced dual-band EMWA properties, attributed to the synergistic effect of the multiphase heterogeneous structure, impedance matching, and multiple magnetic dielectric loss mechanisms. Zn 0.1 Co 0.9 -BTC-derived ZnO/Co@PC composites exhibit good performance with the minimum reflection loss/the maximum effective absorption bandwidth values of −69.3 dB/6.3 and −48.8 dB/7.2 GHz, in the range of 2–18 and 26.5–40 GHz with minimum thicknesses. The superior dual-band attenuation properties of the as-prepared material have been verified by radar cross-section simulation. This research paves the way for novel guidance for utilizing MOF derivatives as potential candidates for dual-band compatible EWMA and offers profound insight into the underlying mechanism of microwave absorption with dual bands.