Carbon-based electromagnetic wave (EMW) absorbing materials attached with metal sulfides famous for good dielectric properties are favored by researchers, which can form heterogeneous interfaces and thus provide supplementary loss mechanisms to make up for the deficiencies of a single material in energy attenuation. Here, CoS/Co@coral-like carbon nanofibers (CNFs)/porous carbon hybrids are successfully fabricated by hydrothermal and chemical vapor deposition. The samples have exceptional EMW absorbing properties, with a minimum reflection loss of −57.48 dB at a thickness of 2.94 mm and an effective absorption bandwidth of up to 6.10 GHz at only 2.20 mm. The interlocking structure formed by Co@coral-like CNFs, interfacial polarization generated by heterostructure of CoS, abundant defects and large specific surface area resulted from porous properties are important factors in attaining magnetic-dielectric balance and excellent absorption performance. Different matrixes are selected instead of paraffin to investigate the effect of matrix materials on EMW absorbing capacity. Besides, the EMW attenuation potential for practical applications is also demonstrated by radar cross-section simulations, electric field intensity distribution and power loss density. This work provides a novel strategy for designing outstanding EMW absorbers with unique microstructures using facile and low-cost synthetic routes.

中文翻译：

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Co9S8/Co@类珊瑚碳纳米纤维/多孔碳混合物具有磁电协同作用，可实现卓越的微波吸收


附着有金属硫化物的碳基电磁波吸收材料以良好的介电性能而受到研究人员的青睐，它可以形成异质界面，从而提供补充损耗机制，弥补单一材料能量衰减的不足。在此，通过水热和化学气相沉积成功制备了 CoS/Co@类珊瑚碳纳米纤维（CNF）/多孔碳混合物。这些样品具有出色的电磁波吸收特性，厚度为 2.94 毫米时的最小反射损耗为 -57.48 dB，厚度仅为 2.20 毫米时有效吸收带宽高达 6.10 GHz。 Co@珊瑚状CNF形成的联锁结构、CoS异质结构产生的界面极化、多孔特性带来的丰富缺陷和大比表面积是实现磁介电平衡和优异吸收性能的重要因素。选择不同的基质代替石蜡，研究基质材料对电磁波吸收能力的影响。此外，雷达截面模拟、电场强度分布和功率损耗密度也证明了实际应用的电磁波衰减潜力。这项工作提供了一种新颖的策略，使用简单且低成本的合成路线设计具有独特微观结构的出色电磁波吸收剂。