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Preparation of Ni/C porous fibers derived from jute fibers for high-performance microwave absorption

机译：衍生自淬火纤维的Ni / C多孔纤维的制备用于高性能微波吸收

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摘要

Composites obtained by incorporating magnetic nanoparticles into porous carbon materials are promising in serving as microwave absorbing materials. In this study, Ni/C porous fibers were successfully synthesized through a simple in situ template method by using low-cost jute fibers as carbon source and template. The results showed that the Ni nanoparticles were uniformly loaded on the surface and hollow porous structure of the Ni/C porous fibers. Meanwhile, the content and size of the Ni nanoparticles on the Ni/C porous fibers can be controlled. Due to a suitable filling content, the synergistic effect of dielectric loss, interface polarization loss, magnetic loss and porous structure of the Ni/C porous fibers, an excellent microwave absorption performance was achieved. The minimum reflection loss value reached ?43.0 dB, and a reflection loss value less than ?10 dB was in the frequency range of 11.2–16.1 GHz with 2.0 mm thickness. In particular, under matching thickness (1.5–3.5 mm), the values of all the reflection loss peaks were below ?20.0 dB. It is believed that this work can not only provide a new way to design excellent carbon-based microwave absorbing materials, but also offer an effective design strategy to synthesize biomass nanocomposites.
机译：通过将磁性纳米颗粒掺入多孔碳材料中获得的复合材料是用作微波吸收材料的。在该研究中，通过使用低成本的黄麻纤维作为碳源和模板，通过简单的原位模板方法成功地合成Ni / C多孔纤维。结果表明，Ni纳米颗粒均匀地装载在Ni / C多孔纤维的表面和中空多孔结构上。同时，可以控制Ni / C多孔纤维上的Ni纳米颗粒的含量和尺寸。由于合适的填充含量，介电损耗的协同效应，界面偏振损失，磁力损失和Ni / C多孔纤维的多孔结构，实现了优异的微波吸收性能。最小反射损耗值达到？43.0dB，低于α10dB的反射损耗值在11.2-16.1GHz的频率范围内，厚度为2.0毫米。特别地，在匹配的厚度（1.5-3.5mm）下，所有反射损耗峰的值低于20.0dB。据信，这项工作不仅可以提供设计优异的碳基微波吸收材料的新方法，还提供了一种合成生物质纳米复合材料的有效设计策略。

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