Magnetic expanded graphite (EG) hybrids were synthesized by co-intercalation polymerization of aniline together with transition metal ions. Experimental results show that metal ions (Fe, Co, Ni, and Cu) and even their mixtures can co-intercalate into graphite interlayers with flexibly controllable ratios and contents. Among these co-intercalation compounds, Fe/Ni-intercalated graphite with a predesigned mole ratio of 1:3 transforms into NiFe₂O₄/FeNi₃@EG during the annealing process. The synthesized magnetic EG hybrids present multiband microwave absorption in C and X bands due to improved impedance match as well as significantly enhanced interfacial polarization relaxation induced by multi-componential metals. The reflection values of −39.1 dB at 6.95 GHz and −25.7 dB at 9.4 GHz are achieved with an ultra-low loading of 5 wt.%. This work provides a flexible approach for tuning the components and structures of magnetic EG hybrids, which may contribute to the development of microwave absorption materials with superior performances.

磁性膨胀石墨 (EG) 杂化物是通过苯胺与过渡金属离子的共插层聚合合成的。实验结果表明，金属离子（Fe、Co、Ni 和 Cu）甚至它们的混合物可以以灵活可控的比例和含量共嵌入石墨夹层中。在这些共插层化合物中，预先设计的摩尔比为1:3的Fe/Ni插层石墨转变为NiFe ₂ O ₄ /FeNi ₃@EG 在退火过程中。由于改进的阻抗匹配以及由多组分金属引起的显着增强的界面极化弛豫，合成的磁性 EG 杂化物在 C 和 X 波段呈现多波段微波吸收。在 6.95 GHz 时的反射值为 -39.1 dB，在 9.4 GHz 时的反射值为 -25.7 dB，这是在 5 wt.% 的超低负载下实现的。这项工作为调整磁性 EG 混合材料的组件和结构提供了一种灵活的方法，这可能有助于开发具有优异性能的微波吸收材料。