Abstract In this work, iron carbide/ferroferric oxide/carbon/reduced graphene oxide (Fe2C/Fe3O4/C/RGO) nanocomposite was fabricated through a facile solvothermal self-assembly and subsequent pyrolysis two-step strategy. Results of micromorphology and structure analysis showed that carbon frameworks displayed unique octahedral structure, and numerous Fe2C and Fe3O4 nanoparticles with an average size ca. 29 nm were evenly attached on the wrinkled and porous surfaces of flake-like RGO. Moreover, the influences of filler contents on the electromagnetic wave (EMW) absorption properties of as-synthesized quaternary nanocomposite were carefully examined. Significantly, the obtained quaternary nanocomposite with a low filler content of 20 wt.% exhibited the integrated optimal EMW absorption capacity, i.e. the minimum reflection loss was −60 dB at 10.8 GHz (X-band), and broad absorption bandwidth reached 5.0 GHz at 1.8 mm. Meanwhile, the reflection loss values were all less than −20 dB with matching thicknesses changing from 1.8 to 5.0 mm. Besides, when the filler content was 25 wt.%, the wider absorption bandwidth of 5.8 GHz was achieved with the same thickness of 1.8 mm. The possible EMW absorption mechanisms were further proposed. Therefore, the as-fabricated nanocomposite could be exploited as promising light-weight and high-efficient absorbers in the field of EMW absorption.

中文翻译：

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具有优异电磁波吸收性能的金属有机骨架衍生的碳化铁/四氧化三铁/碳/还原氧化石墨烯纳米复合材料

摘要 在这项工作中，通过简便的溶剂热自组装和随后的热解两步策略制备了碳化铁/四氧化三铁/碳/还原氧化石墨烯（Fe2C/Fe3O4/C/RGO）纳米复合材料。微观形貌和结构分析结果表明，碳骨架显示出独特的八面体结构，以及许多平均尺寸约为 10 的 Fe2C 和 Fe3O4 纳米粒子。29 nm 均匀地附着在片状 RGO 的皱纹和多孔表面上。此外，还仔细研究了填料含量对合成的四元纳米复合材料的电磁波 (EMW) 吸收性能的影响。值得注意的是，获得的具有 20 wt.% 低填料含量的四元纳米复合材料表现出综合最佳 EMW 吸收能力，即在 10 时最小反射损耗为 -60 dB。8 GHz（X 波段），宽吸收带宽在 1.8 mm 处达到 5.0 GHz。同时，反射损耗值均小于-20 dB，匹配厚度从1.8 mm变为5.0 mm。此外，当填料含量为 25 wt.% 时，在 1.8 mm 的相同厚度下实现了更宽的 5.8 GHz 吸收带宽。进一步提出了可能的 EMW 吸收机制。因此，制备的纳米复合材料可作为有前途的轻质高效吸收剂在 EMW 吸收领域中被利用。8 毫米。进一步提出了可能的 EMW 吸收机制。因此，制备的纳米复合材料可作为有前途的轻质高效吸收剂在 EMW 吸收领域中被利用。8 毫米。进一步提出了可能的 EMW 吸收机制。因此，制备的纳米复合材料可作为有前途的轻质高效吸收剂在 EMW 吸收领域中被利用。