Innovation Center for Textile Science and Technology , Donghua University , Shanghai 200051 , China.
ACS Appl Mater Interfaces. 2018 Dec 26;10(51):44561-44569. doi: 10.1021/acsami.8b17514. Epub 2018 Dec 11.
With the fast advancement of up-to-date communication technologies, electromagnetic wave (EMW) absorption materials are widely required for various applications. However, it is still a big challenge to produce lightweight, flexible, and high-efficiency EMW absorption materials in a broad-ranging frequency. Herein, we designed to fabricate the magnetic and dielectric nanofibrous membranes which can be effectively used as EMW absorption materials by facile electrospinning process. The as-fabricated composite carbon nanofibers (CNFs), which combined the components of nickel, cobalt antioxidant nanoparticles, and carbon nanotubes, exhibited outstanding magnetic and dielectric properties and strong absorption ability in a wide frequency range. These nanoparticles encapsulated in CNFs are extremely beneficial to the electrical conductivity of the composites through decreasing the contact loss within the CNFs by formation of the metal-metal interfaces. Correspondingly, the R value of -46.60 dB was reached at 4.88 GHz frequency range with a layer thickness of 5.5 mm for these mechanically light and flexible membranes. The enhanced absorption performance (<-10 dB) in the wide frequency band (4.16-18 GHz) can be achieved by selecting a suitable thickness of the material. Results demonstrate that the permittivity and permeability of developed samples have been largely improved because of the integrated interaction of all introduced components in the structure. The composite membranes are a promising candidate for scalable, lightweight, and high-performance EMW absorption materials in the frequency range from C band to Ku band (4-18 GHz).
随着最新通信技术的快速发展，各种应用都广泛需要电磁波（EMW）吸收材料。然而，在广泛的频率范围内生产轻量、灵活、高效的 EMW 吸收材料仍然是一个巨大的挑战。在此，我们通过简单的静电纺丝工艺设计了可有效用作 EMW 吸收材料的磁性和介电纳米纤维膜。所制备的复合碳纳米纤维（CNFs），结合了镍、钴抗氧化纳米粒子和碳纳米管的成分，在宽频率范围内表现出出色的磁性和介电性能以及强大的吸收能力。这些纳米粒子封装在 CNFs 中，通过形成金属-金属界面，极大地有利于复合材料的导电性，减少 CNFs 内部的接触损耗。相应地，这些机械轻量且灵活的薄膜在 4.88 GHz 频率范围内的 R 值达到了-46.60 dB，层厚为 5.5 mm。通过选择合适的材料厚度，可以在宽频带（4.16-18 GHz）内实现增强的吸收性能（<-10 dB）。结果表明，由于结构中所有引入成分的综合相互作用，开发样品的介电常数和磁导率得到了很大的提高。该复合膜是一种很有前途的候选材料，可用于在 C 波段到 Ku 波段（4-18 GHz）范围内的可扩展、轻量和高性能 EMW 吸收材料。
