Abstract Expanded graphite (EG) is a carbon material prepared by the thermal expansion of graphite intercalation compounds. Herein, a novel chemical preparation method is employed to obtain magnetic EG composites with excellent radar attenuation performance in the 2–18 GHz range. Ferrocene is first intercalated into the natural flake graphite to form ferrocene graphite intercalation compounds (FGICs), and then oxidises to Fe3O4 during the thermal expansion of FGICs at 900 °C, while the FGICs are converted into magnetic EG composites in this process. The success of ferrocene intercalation reaction is confirmed by transmission electron microscopy, fourier transformation infrared spectroscope, X-ray diffraction, and energy-dispersive X-ray spectroscopy studies. The components and radar attenuation property of the magnetic EG composites are discussed. Both Fe3O4 and Fe2O3 exist in the final EG composites and a high radar attenuation of −18 dB at 18 GHz is obtained, while the ferrocene/graphite ratio in the FGICs is 20%. The excellent radar attenuation property of the magnetic EG composites, together with good homogeneity and dispersion in air, can allow the composites to be used in many potential applications in radar countermeasure.

中文翻译：

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一阶二茂铁石墨插层化合物热膨胀所得磁性膨胀石墨气溶胶的雷达衰减性能

摘要 膨胀石墨（EG）是一种由石墨插层化合物热膨胀制备的碳材料。在此，采用一种新的化学制备方法获得了在 2-18 GHz 范围内具有优异雷达衰减性能的磁性 EG 复合材料。二茂铁首先嵌入天然鳞片石墨中形成二茂铁石墨插层化合物（FGICs），然后在 FGICs 在 900 °C 热膨胀过程中氧化成 Fe3O4，而 FGICs 在此过程中转化为磁性 EG 复合材料。透射电子显微镜、傅里叶变换红外光谱、X 射线衍射和能量色散 X 射线光谱研究证实了二茂铁插层反应的成功。讨论了磁性EG复合材料的成分和雷达衰减特性。Fe3O4 和 Fe2O3 都存在于最终的 EG 复合材料中，并且在 18 GHz 下获得了 -18 dB 的高雷达衰减，而 FGIC 中的二茂铁/石墨比为 20%。磁性EG复合材料优异的雷达衰减特性，以及在空气中良好的均匀性和分散性，可以使复合材料在雷达对抗中的许多潜在应用中得到应用。