Abstract Fabrication of smart materials for electromagnetic (EM) wave absorption has been propounded as efficient EM interference and pollution mitigation method. Herein, a porous lightweight graphene@Ni0.5Co0.5Fe2O4 composite was prepared via a coprecipitation method. The results show that Ni0.5Co0.5Fe2O4 nanoparticles are homogeneously dispersed and anchored on the graphene flakes. Investigation of the EM waves absorption properties of the material at different filling in paraffin reveals that at 15 wt% loading, the composite absorbs large percent of the EM waves at minimal thickness. The composite attains optimum reflection loss peak −44.7 dB at 17.45 GHz, with 1.5 mm thickness. This enhanced EM wave absorption performance (at lesser thickness than Ni0.5Co0.5Fe2O4 in literature) could be ascribed to interfacial polarization and a good impedance match arising from unique pore configuration of the dielectric (graphene) and magnetic (Ni0.5Co0.5Fe2O4) composite. These results indicate that the lightweight G@Ni0.5Co0.5Fe2O4 composites with strong absorption at reduced thickness is an efficient absorber for high-frequency EM wave attenuation.

中文翻译：

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石墨烯@Ni0.5Co0.5Fe2O4 混合骨架，具有增强的界面极化以吸收电磁波

摘要 制造用于电磁 (EM) 波吸收的智能材料已被提出作为有效的电磁干扰和污染减轻方法。在此，通过共沉淀法制备了多孔轻质石墨烯@Ni0.5Co0.5Fe2O4 复合材料。结果表明，Ni0.5Co0.5Fe2O4 纳米颗粒均匀分散并锚定在石墨烯薄片上。对不同石蜡填充材料的 EM 波吸收特性的研究表明，在 15 wt% 的负载下，复合材料以最小的厚度吸收了大部分的 EM 波。该复合材料在 17.45 GHz 处达到最佳反射损耗峰值 -44.7 dB，厚度为 1.5 mm。这增强了 EM 波吸收性能（厚度小于 Ni0.5Co0. 文献中的 5Fe2O4）可归因于介电（石墨烯）和磁性（Ni0.5Co0.5Fe2O4）复合材料的独特孔结构所产生的界面极化和良好的阻抗匹配。这些结果表明，轻质 G@Ni0.5Co0.5Fe2O4 复合材料在减小的厚度下具有强吸收性，是高频电磁波衰减的有效吸收体。