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首页> 外文期刊>Nanotechnology >Design of MOF-derived hierarchical Co@C@RGO composite with controllable heterogeneous interfaces as a high-efficiency microwave absorbent
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Design of MOF-derived hierarchical Co@C@RGO composite with controllable heterogeneous interfaces as a high-efficiency microwave absorbent

机译：使用可控的异构接口设计MOF衍生的分层CO @ C @ RGO复合材料作为高效微波吸收剂

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Carbon-based composites have triggered tremendous attention in the development of high-efficiency microwave absorbers, due to their compatibility, light weight, and high microwave absorption. However, fabricating carbon-based absorbers with a strong absorption ability in a broad frequency range is challenging. Hence, a facile strategy was used to produce Co@C derived from a zeolitic imidazolate framework (ZIF)@ graphene. The Co@C@RGO composite was obtained by annealing the ZIF67/GO nanocomposite precursor at 650 degrees C in a nitrogen atmosphere. Due to the magnetic loss induced by the Co particles, the dielectric loss generated by the carbon skeletons and graphene, and the interfacial polarization between the components, the hierarchical composite exhibits superior electromagnetic (EM) wave absorption properties. The optimal reflection loss (R-L) of the Co@C@ RGO composite can be up to -67.5 dB at 2.6 mm, and the effective bandwidth (>=-10 dB) is 5.4 GHz (10-15.4 GHz) with a thickness of 2 mm at 20 wt% loading. The dipolar polarization caused by graphene, as well as enhanced impedance matching, synergistic effect and interfacial effect among the components, increase the microwave absorption performance of the composite. This work may open a new path to use the Co@C@RGO composite with its high-efficiency EM wave properties as an absorber.
机译：由于其相容性，重量轻，微波吸收，碳基复合材料在高效微波吸收器的开发中引发了巨大的关注。然而，在宽频率范围内具有强吸收能力的碳基吸收剂具有挑战性。因此，用于生产衍生自沸石咪唑酯框架（ZIF）的CO @ C的体策略。通过在氮气氛中在650℃下退火ZIF67 / GO纳米复合前体来获得CO @ C 1 rgo复合材料。由于CO颗粒诱导的磁损失，由碳骨架和石墨烯产生的介电损耗以及组分之间的界面偏振，等级复合材料表现出优异的电磁（EM）波吸收性能。 CO @ rgo复合材料的最佳反射损耗（RL）可高达-67.5 dB，为2.6 mm，有效带宽（> = - 10 dB）为5.4 GHz（10-15.4GHz），厚度20％wt％的载荷为2毫米。由石墨烯引起的双极极化，以及增强的阻抗匹配，组分之间的协同效应和界面效应，增加了复合材料的微波吸收性能。这项工作可以打开新的路径，以使用CO @ C @ RGO复合材料，其高效EM波属性作为吸收器。

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