Construction of caterpillar-like hierarchically structured Co/MnO/CNTs derived from MnO2/ZIF-8@ZIF-67 for electromagnetic wave absorption
Construction of caterpillar-like hierarchically structured Co/MnO/CNTs derived from MnO2/ZIF-8@ZIF-67 for electromagnetic wave absorption
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DOI：
10.1016/j.carbon.2020.11.016
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发表时间：
2021-03-01
期刊：
影响因子：
10.9
通讯作者：
Hou, Zhi-Ling
中科院分区：
文献类型：
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作者：
Xue, Wei;Yang, Gen;Hou, Zhi-Ling
金属有机骨架（MOFs）衍生的碳基复合材料在电磁波吸收领域显示出巨大的潜力。然而，哪种mof衍生物结构具有更好的电磁波吸收能力是一个迫切需要解决的问题。本文通过核壳型二氧化锰和沸石咪唑酸酯骨架模板的热解，成功制备了蠕蠕状结构的Co/MnO/CNTs。基于层次化结构，该材料在不同频率范围内均表现出优异的EMW吸收性能。由于碳纳米管在蠕虫状分层结构上的独特分布，产生的多非均质界面和局部导电网络有利于界面极化、传导损耗、匹配阻抗和多次散射。该复合材料具有优异的EMW吸收性能，有效吸收带宽为13.52 GHz ~ 18 GHz，厚度仅为1.32 mm。此外，该复合材料还具有5.36 GHz的合格频率带宽的微波吸收，并且具有-58.0 dB的强反射损耗，填充量低至35%。这为开发具有分层结构的EMW吸波材料提供了新的途径。(C) 2020 Elsevier Ltd.版权所有。
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. (C) 2020 Elsevier Ltd. All rights reserved.