Graphite Wrapped FeNi3/Co with Carbon Nanotubes Anchored on MgO@Carbon Fiber Reinforcements via Continuous Fabrication for High-Efficiency Microwave Attenuation

IF 17.2 1区 工程技术 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY
Chengjuan Wang, Haotian Jiang, Xianzhao Cao, Xu He, Xuanbo Chen, Bowen Cui, Xiaodan Xu, Yanxiang Wang, Chengguo Wang
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Abstract

Carbon fiber (CF) has emerged as a promising candidate for microwave absorbers to resolve the escalating electromagnetic wave (EMW) pollution issue, not just serving as a structural reinforcement. However, the drawbacks, such as high conductivity, limit its ability to strongly absorb EMWs over a wide bandwidth. To address these challenges, graphite wrapped FeNi3/Co with carbon nanotubes (CNTs) anchored on MgO@CF heterostructures were synthesized by introducing MgO nanofilms on a CF surface and subsequent chemical vapor deposition catalyzed by two-phase catalysts. The synthesis of MgO suppresses the etching of CF during the experimental processes, effectively maintaining the inherent structure of CF, which is conducive to constructing rich conductive networks and developing excellent mechanical properties. By modulating the catalyst concentration, deposited CNTs with appropriate defects increase the conduction loss and stimulate defect polarization loss. The abundant interfaces formed by multiple components lead to fulfilling interface polarization, while the doping of O heteroatoms causes dipole polarization. In addition, the introduction of FeNi3/Co generates effective magnetic loss and optimizes electromagnetic parameters to form more matching impedance conditions. At a low filler loading of 23 wt%, the stable sample obtains a remarkable minimum reflection loss of up to − 72.08 dB at merely 1.38 mm with an effective absorption bandwidth reaching 4.88 GHz at only 1.44 mm, which is superior to that of numerous distinguished carbon-based composites in regard to being “thin, light, wide and strong”. CST simulation reveals that the maximum radar cross section reduction acquires 26.88 dBm2, ascertaining the radar stealth capability of the distinctive heterostructure. Moreover, great mechanical and electromagnetic interference shielding performance is demonstrated by epoxy composites. Henceforth, this study proposes profound insights into the intricate relationship between the structure and EMW absorbing mechanism, and elucidates an attractive strategy for mass-producing modified CF-based hybrids for versatile applications.

Graphical Abstract

Abstract Image

通过连续制造将石墨包裹的 FeNi3/Co与碳纳米管锚定在 MgO@ 碳纤维增强材料上以实现高效微波衰减
碳纤维(CF)已成为解决日益严重的电磁波(EMW)污染问题的微波吸收体的理想候选材料,而不仅仅是一种结构加固材料。然而,高导电性等缺点限制了其在宽带宽范围内强烈吸收电磁波的能力。为了应对这些挑战,研究人员在 CF 表面引入氧化镁纳米薄膜,随后在两相催化剂的催化下进行化学气相沉积,从而合成了锚定在氧化镁@CF 异质结构上的石墨包裹铁镍3/Co 和碳纳米管(CNT)。氧化镁的合成抑制了实验过程中对 CF 的刻蚀,有效地保持了 CF 的固有结构,有利于构建丰富的导电网络并形成优异的力学性能。通过调节催化剂浓度,沉积的具有适当缺陷的 CNT 增加了传导损耗,并刺激了缺陷极化损耗。由多种成分形成的丰富界面会导致满足的界面极化,而 O 杂原子的掺杂则会导致偶极极化。此外,FeNi3/Co 的引入产生了有效的磁损耗,并优化了电磁参数,形成了更匹配的阻抗条件。在填充量为 23 wt% 的低填充量下,稳定的样品在 1.38 mm 时的最小反射损耗高达 - 72.08 dB,在 1.44 mm 时的有效吸收带宽达到 4.88 GHz,在 "薄、轻、宽、强 "方面优于众多杰出的碳基复合材料。CST 仿真显示,最大雷达截面降低了 26.88 dBm2,从而确定了这种独特异质结构的雷达隐身能力。此外,环氧树脂复合材料还具有良好的机械和电磁干扰屏蔽性能。因此,本研究对结构与电磁波吸收机制之间的复杂关系提出了深刻的见解,并阐明了一种具有吸引力的战略,可用于批量生产改性 CF 基混合材料,以实现多种应用。
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来源期刊
CiteScore
18.70
自引率
11.20%
发文量
109
期刊介绍: Advanced Fiber Materials is a hybrid, peer-reviewed, international and interdisciplinary research journal which aims to publish the most important papers in fibers and fiber-related devices as well as their applications.Indexed by SCIE, EI, Scopus et al. Publishing on fiber or fiber-related materials, technology, engineering and application.
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