Abstract The NiCo2 nanoparticles and NiCo2/carbon nanotubes (CNTs) nanohybrids were prepared by a single-model microwave heating and annealing treatment. It was found that the NiCo2 nanoparticles were evenly distributed around with CNTs. As a result, the complex permittivity of NiCo2/CNTs nanohybrids could be adjusted effectively, and achieved a well impedance matching for the microwave absorption. The dielectric loss, magnetic loss mechanism and the impedance matching were also investigated systematically. As a result, the reflection loss (RL) less than −20 dB (99% absorption) were observed at 3.7–16.5 GHz with the thickness of 1.2–4.0 mm; moreover, the maximum bandwidth of the RL values less than −10 dB (90% absorption) was 4.4 GHz (12.5–16.9 GHz), and a minimum RL value of −25.5 dB could be observed at 14.7 GHz with the thickness of 1.3 mm. These performances revealed that the NiCo2/10%CNTs nanohybrids have a great potential to be used as the lightweight microwave absorption material.

中文翻译：

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散布碳纳米管的 NiCo2 纳米粒子增强的电磁波吸收特性

摘要 NiCo2 纳米颗粒和NiCo2/碳纳米管(CNTs) 纳米复合物是通过单模型微波加热和退火处理制备的。发现NiCo 2 纳米颗粒均匀分布在CNT周围。因此，可以有效地调节 NiCo2/CNTs 纳米杂化物的复介电常数，并实现良好的微波吸收阻抗匹配。还系统地研究了介电损耗、磁损耗机制和阻抗匹配。结果，在 3.7-16.5 GHz 且厚度为 1.2-4.0 mm 时观察到反射损耗 (RL) 小于 -20 dB（99% 吸收）；此外，小于−10 dB（90% 吸收）的 RL 值的最大带宽为 4.4 GHz（12.5–16.9 GHz），在 14.7 GHz 厚度为 1.3 mm 时可以观察到最小 RL 值 -25.5 dB .