In response to the increasingly serious problem of electromagnetic wave pollution, there is a growing demand for materials capable of absorbing electromagnetic waves. A crucial strategy involves optimizing the microstructure and composition of these materials. In this study, the Ni/NiO/C/MnO@PPy (NCMP) composites are successfully fabricated through the combination of hydrothermal method, high-temperature calcination process, chemical method and polymerization. Due to the strong synergistic effect of the dielectric and magnetic components, and good impedance match, the NCMP-40 exhibits excellent electromagnetic wave absorption properties, with an optimal reflection loss (RL) of −56.23 dB at a thickness of 3.87 mm, and a high effective absorption bandwidth (EAB) of 6.86 GHz (10.68–17.54 GHz) at a thickness of 1.97 mm covering the entire Ku-band part of the X-band. Moreover, the radar cross section (RCS) attenuation is obtained through a simulation procedure. Compared to the sole perfect electrically conductive (PEC) layer, the PEC layer coated with NCMP-40 achieves an RCS value consistently below −10 dB m in the range of −60° < θ < 60°, and an RCS value is −22.0 dB m at θ = 0°. The prepared NCMP-40 presented herein shows excellent electromagnetic wave absorption performances. And this study provides a new method for the structural design of electromagnetic wave absorption materials.

中文翻译：

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高性能电磁波吸收中空Ni/NiO/C/MnO2@聚吡咯核壳结构的制备

针对日益严重的电磁波污染问题，对能够吸收电磁波的材料的需求不断增长。一个关键策略涉及优化这些材料的微观结构和成分。本研究通过水热法、高温煅烧法、化学法和聚合法的结合成功制备了Ni/NiO/C/MnO@PPy (NCMP)复合材料。由于介电和磁性成分的强烈协同效应以及良好的阻抗匹配，NCMP-40表现出优异的电磁波吸收性能，在3.87 mm的厚度下最佳反射损耗（RL）为-56.23 dB，并且厚度为 1.97 mm 时，有效吸收带宽 (EAB) 为 6.86 GHz (10.68–17.54 GHz)，覆盖 X 波段的整个 Ku 波段部分。此外，雷达散射截面（RCS）衰减是通过模拟程序获得的。与单独的完美导电（PEC）层相比，涂覆有NCMP-40的PEC层在-60° < θ < 60°范围内实现了始终低于-10 dB m的RCS值，RCS值为-22.0 θ = 0° 时的 dB m。本文制备的 NCMP-40 显示出优异的电磁波吸收性能。该研究为电磁波吸收材料的结构设计提供了新的方法。