Electromagnetic wave has emerged as a new source of environmental pollution in the daily life. Therefore, the prominent microwave absorbents are urgently needed. In this work, the carbon aerogel and Fe₃O₄ nanoparticle (Fe₃O₄/CA) composites with core–shell structure were facilely prepared by a self-assembly process between carbon aerogels and Fe ion under the hydrothermal condition. The microwave absorption performance was significantly enhanced due to the perfect impedance matching and effective interface polarization. Compared with Fe₃O₄ nanoparticles and carbon aerogels, Fe₃O₄/CA composites show the advantages of strong microwave absorption and broad absorption bandwidth. The maximum RL value of Fe₃O₄/CA composites is up to −50.96 dB at 4.80 GHz. And also, the effective absorption bandwidth reaches 3.82 GHz with the thickness of 2 mm.

电磁波已成为日常生活中新的环境污染源。因此，迫切需要突出的微波吸收剂。在这项工作中，碳气凝胶和具有核壳结构的Fe ₃ O ₄纳米颗粒 (Fe ₃ O ₄ /CA) 复合材料通过碳气凝胶和 Fe 离子在水热条件下的自组装过程轻松制备。由于完美的阻抗匹配和有效的界面极化，微波吸收性能显着增强。与 Fe ₃ O ₄纳米颗粒和碳气凝胶相比，Fe ₃ O ₄/CA 复合材料显示出强微波吸收和宽吸收带宽的优点。Fe ₃ O ₄ /CA 复合材料的最大 RL 值在 4.80 GHz 时高达 -50.96 dB。而且，有效吸收带宽达到 3.82 GHz，厚度为 2 mm。