Microwave absorption performances can be remarkably enhanced using an electromagnetic (EM) wave absorber with synergistically dielectric and magnetic losses. In this study, the eggplant was used as a raw material to produce silicon carbide (SiC) aerogel by two steps: carbonization and subsequent carbothermic reduction. Then the magnetic NiCo layer was coated on the SiC aerogel (NiCo–SiC) by chemical plating method. The NiCo-SiC aerogel with an extremely low density (0.194 g/cm³) primarily composed of a porous SiC skeleton, SiC nanowires, and the magnetic NiCo alloy nanoparticles distributed on SiC skeleton and nanowires surfaces. The existence of magnetic NiCo alloy nanoparticles in the aerogel, the magnetic and dielectric losses are both increased by the formed heterogeneous interfaces. Thus, the NiCo–SiC aerogel with a thickness of 3 mm exhibits a minimum reflection loss (RL_min) of − 44.5 dB and an effective absorption bandwidth (RL<−10 dB) of 7.6 GHz, which displays the potential application in lightweight and excellent EM wave absorbers.

使用具有协同介电和磁损耗的电磁 (EM) 波吸收器可以显着提高微波吸收性能。在这项研究中，以茄子为原料，通过碳化和随后的碳热还原两个步骤生产碳化硅 (SiC) 气凝胶。然后通过化学镀法将磁性NiCo层涂覆在SiC气凝胶（NiCo-SiC）上。NiCo-SiC 气凝胶具有极低的密度（0.194 g/cm ³) 主要由多孔 SiC 骨架、SiC 纳米线和分布在 SiC 骨架和纳米线表面的磁性 NiCo 合金纳米粒子组成。气凝胶中磁性镍钴合金纳米粒子的存在，由于异质界面的形成而增加了磁损耗和介电损耗。因此，厚度为 3 mm 的 NiCo-SiC 气凝胶的最小反射损耗 (RL _min ) 为 - 44.5 dB，有效吸收带宽 (RL<-10 dB) 为 7.6 GHz，显示出在轻量化和优秀的电磁波吸收器。