Carbon-based magnetic absorbents are widely used for electromagnetic wave absorption (EMWA) rubber composites due to the dual electromagnetic wave loss effects of dielectric loss and magnetic loss. Co/CoO nanoparticles decorated carbon nanofiber aerogels (C/Co/CoO aerogels) are prepared by carbonization of nanofiber network structure agarose/cobalt acetate. The in-situ synthetic C/Co/CoO aerogels with carbon nanofiber network structure and controllable particle size of Co/CoO nanoparticles that have the good conductivity and tunable magnetic property increasing both of the dielectric loss and magnetic loss capabilities, which can improve the EMWA performance. Lightweight EMWA rubber composites with 3.75 wt% C/Co/CoO aerogels have the same density as that of silicone rubber (PDMS), the effective absorption band (EAB, frequency for reflection loss<−10 dB) of PDMS/Co-1.25 is aways above 3 GHz when the thickness is bigger than 2.5 mm, the max EAB is 4.24 GHz at the thickness of 2.74 mm. The radar cross section (RCS) reduction can achieve 14 dBm when the perfectly electrically conductive (PEC) is covered by a 4.5 mm thick PDMS/Co-1.25. The intensity distributions of electric field, magnetic field and power loss density of EMWA rubber composites are exhibited based on the electromagnetic parameters. The rubber composites based on C/Co/CoO aerogels can be used as lightweight flexible EMWA materials.

中文翻译：

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原位合成Co/Co3O4纳米粒子修饰的碳纳米纤维气凝胶用于具有多重损耗效应的轻质电磁波吸收橡胶复合材料

由于介电损耗和磁损耗的双重电磁波损耗效应，碳基磁性吸收剂被广泛用于电磁波吸收（EMWA）橡胶复合材料。 Co/CoO纳米粒子修饰的碳纳米纤维气凝胶（C/Co/CoO气凝胶）是通过纳米纤维网络结构琼脂糖/醋酸钴的碳化制备的。原位合成的C/Co/CoO气凝胶具有碳纳米纤维网络结构和可控粒径的Co/CoO纳米粒子，具有良好的导电性和可调的磁性能，同时增加介电损耗和磁损耗能力，可以提高EMWA表现。含有 3.75 wt% C/Co/CoO 气凝胶的轻质 EMWA 橡胶复合材料具有与硅橡胶 (PDMS) 相同的密度，PDMS/Co-1.25 的有效吸收带（EAB，反射损耗频率<-10 dB）为当厚度大于2.5mm时，频率远高于3GHz，在厚度为2.74mm时，最大EAB为4.24GHz。当完全导电 (PEC) 被 4.5 毫米厚的 PDMS/Co-1.25 覆盖时，雷达截面 (RCS) 减少可达到 14 dBm。基于电磁参数，展示了 EMWA 橡胶复合材料的电场、磁场和功率损耗密度的强度分布。基于C/Co/CoO气凝胶的橡胶复合材料可用作轻质柔性EMWA材料。