Abstract A combination of carbon materials and metal materials has received extensive attention of applications in electromagnetic wave (EMW) absorption. Herein, the porous Fe/C composites were fabricated by pyrolyzing Fe-MOFs precursor with different organic ligand ratios under Ar atmosphere. The Fe/C composites exhibited an excellent EMW absorption ability on account of the unique porous structure architecture, enhanced dipolar/interfacial polarization between two components, improved multiple reflection and scattering, and better impedance matching. The EMW absorption performance of three kinds of porous Fe/C composites was studied in detail. Among them, the minimum reflection loss (RL) of FC-1 sample could reach − 19.57 dB at a thickness of 2 mm with a better effective bandwidth (RL ≤ − 10 dB) covering the whole Ku band. Notably, the optimal RL of FC-2 sample achieved − 56.94 dB at a thickness of 3.1 mm, besides, the effective absorption bandwidth could reach 6.73 GHz with the thickness of only 2.5 mm. These results confirm that the as-prepared Fe/C composites with high-performance EMW absorption ability and broad effective bandwidth are a promising candidates as an EMW absorber.

中文翻译：

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基于铁基 MOFs 衍生的 Fe/C 复合材料的高性能电磁波吸收器

摘要 碳材料与金属材料的结合在电磁波（EMW）吸收方面的应用受到广泛关注。在此，多孔 Fe/C 复合材料是通过在 Ar 气氛下热解具有不同有机配体比例的 Fe-MOFs 前驱体制备的。Fe/C复合材料由于其独特的多孔结构结构、增强的两个组分之间的偶极/界面极化、改善的多次反射和散射以及更好的阻抗匹配而表现出优异的EMW吸收能力。详细研究了三种多孔Fe/C复合材料的EMW吸收性能。其中，FC-1 样品的最小反射损耗（RL）在厚度为 2 mm 时可达到 − 19.57 dB，并具有更好的覆盖整个 Ku 波段的有效带宽（RL ≤ − 10 dB）。尤其，FC-2 样品的最佳 RL 在厚度为 3.1 mm 时达到 - 56.94 dB，此外，有效吸收带宽可以达到 6.73 GHz，厚度仅为 2.5 mm。这些结果证实，所制备的具有高性能 EMW 吸收能力和宽有效带宽的 Fe/C 复合材料是作为 EMW 吸收剂的有希望的候选者。