Abstract Metal-organic frameworks (MOFs) derived carbon-based composites exhibit great potential in the fields of electromagnetic wave (EMW) absorption. However, which kind of MOFs derivative structure has better electromagnetic wave absorption is an urgent problem to be addressed. Herein, caterpillar-like hierarchically structured Co/MnO/CNTs was successfully prepared by pyrolysis of core-shell manganese dioxide and zeolitic imidazolate framework template. The material shows excellent EMW absorption performance in different frequencies range based on the hierarchical structure. Owing to the unique distribution of carbon nanotubes on the caterpillar-like hierarchical structure, the generated multi heterogeneous interfaces and local conductive network are beneficial to interfacial polarization, conduction loss, matched impedance as well as multiple scattering. The composite composites present outstanding EMW absorption achieved with effective absorption bandwidth covering from 13.52 GHz to 18 GHz with thickness of only 1.32 mm. Moreover, the composite also demonstrates a microwave absorption with the qualified frequency bandwidth of 5.36 GHz, and a strong reflection loss of −58.0 dB with a low filling amount of 35%. The result provides a new approach for developing EMW absorbing materials with hierarchical structure.

中文翻译：

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由MnO2/ZIF-8@ZIF-67衍生的用于电磁波吸收的毛虫状分层结构Co/MnO/CNTs的构建

摘要 金属有机框架（MOFs）衍生的碳基复合材料在电磁波（EMW）吸收领域表现出巨大的潜力。然而，哪种MOFs衍生结构具有更好的电磁波吸收能力是一个亟待解决的问题。在此，通过核壳二氧化锰和沸石咪唑酯骨架模板的热解成功制备了类毛虫分层结构的 Co/MnO/CNTs。该材料基于分级结构在不同频率范围内表现出优异的EMW吸收性能。由于碳纳米管在履带状层次结构上的独特分布，产生的多异质界面和局部导电网络有利于界面极化、传导损耗、匹配阻抗以及多重散射。复合材料表现出出色的 EMW 吸收，有效吸收带宽覆盖 13.52 GHz 至 18 GHz，厚度仅为 1.32 毫米。此外，该复合材料还表现出微波吸收，合格的频率带宽为 5.36 GHz，反射损耗为 -58.0 dB，低填充量为 35%。该结果为开发具有层次结构的电磁波吸收材料提供了一种新方法。0 dB，低填充量为 35%。该结果为开发具有层次结构的电磁波吸收材料提供了一种新方法。0 dB，低填充量为 35%。该结果为开发具有层次结构的电磁波吸收材料提供了一种新方法。