A facile strategy for customizing multifunctional magnetic‑dielectric carbon microflower superstructures deposited with carbon nanotubes

IF 11.2 1区 材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY
Chengjuan Wang, Yanxiang Wang, Haotian Jiang, Yanqiu Feng, Deli Yang, Chengguo Wang
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Abstract

The novel fabrication of multiple components and unique heterostructure can inject infinite vitality into the electromagnetic wave (EMW) attenuation field. Herein, through the self-assembly of polyimide complexes and catalytic chemical vapor deposition, porous carbon microflowers were synthesized accompanied by carbon nanotubes (CNTs). By regulating the metal ions, the composition and structure of the as-obtained hybrids are modified correspondingly, and thus the adjustable thermal management and EMW absorption capabilities are obtained. In detail, the rich pores and huge specific surface area endow the hierarchical structures with distinguished thermal insulation ability (λ<0.07). The carbon framework and CNTs are beneficial for consuming EMWs via conductive loss and defect polarization loss while reducing the filling ratio and thickness. The doped heteroatoms and abundant heterointerfaces generate ample dipole polarization and interface polarization losses (supported by DFT calculation). The metal nanoparticles uniformly embedded in the carbon framework offer optimized impedance matching, proper defect polarization, and suitable magnetic loss. Accordingly, the synergy of magnetic-dielectric balance and flower-like superstructure enables FNCFN2 and NNCFN2 to accomplish remarkable microwave absorbing capacity with thin thickness (14 wt.%). Therefore, respectable specific reflection loss and specific effective absorption bandwidth are acquired (215.39 dB mm–1 and 22.10 GHz mm–1, 257.23 dB mm–1 and 22.12 GHz mm–1 respectively), superior to those of certain renowned carbon-based absorbers. The simulation results of electric field intensity distributions, power loss density, and radar cross section reduction (maximum value of 36.02 dBm2) also verify the prominent radar stealth capability. Moreover, the customizable approach can be applied to other metals to obtain fulfilling behaviors. Henceforth, this work provides profound insights into the relationship between structure and performance, and proposes an efficient path for mass-producing multifunctional and high-performance EMW absorbers with excellent thermal properties.

Abstract Image

定制碳纳米管沉积的多功能磁介质碳微花超结构的简便策略
多种成分和独特异质结构的新型制造方法可为电磁波衰减领域注入无限活力。本文通过聚酰亚胺复合物的自组装和催化化学气相沉积,合成了伴有碳纳米管(CNTs)的多孔碳微流。通过调节金属离子的含量,可以相应地改变混合物的组成和结构,从而获得可调节的热管理和电磁波吸收能力。具体而言,丰富的孔隙和巨大的比表面积赋予了分层结构卓越的隔热能力(λ<0.07)。碳骨架和碳纳米管有利于通过导电损耗和缺陷极化损耗消耗电磁波,同时降低填充率和厚度。掺杂的杂原子和丰富的杂界面会产生大量的偶极极化和界面极化损耗(通过 DFT 计算得到支持)。均匀嵌入碳框架的金属纳米颗粒提供了优化的阻抗匹配、适当的缺陷极化和合适的磁损耗。因此,磁介质平衡和花朵状上层结构的协同作用使 FNCFN2 和 NNCFN2 能够以较薄的厚度(14 wt.%)实现显著的微波吸收能力。因此,它们获得了可观的比反射损耗和比有效吸收带宽(分别为 215.39 dB mm-1 和 22.10 GHz mm-1,257.23 dB mm-1 和 22.12 GHz mm-1),优于某些著名的碳基吸收体。电场强度分布、功率损耗密度和雷达截面减小(最大值为 36.02 dBm2)的模拟结果也验证了其突出的雷达隐身能力。此外,这种可定制的方法还可应用于其他金属,以获得满足要求的行为。因此,这项工作为结构与性能之间的关系提供了深刻的见解,并为批量生产具有优异热性能的多功能高性能电磁波吸收器提出了一条有效的途径。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Journal of Materials Science & Technology
Journal of Materials Science & Technology 工程技术-材料科学:综合
CiteScore
20.00
自引率
11.00%
发文量
995
审稿时长
13 days
期刊介绍: Journal of Materials Science & Technology strives to promote global collaboration in the field of materials science and technology. It primarily publishes original research papers, invited review articles, letters, research notes, and summaries of scientific achievements. The journal covers a wide range of materials science and technology topics, including metallic materials, inorganic nonmetallic materials, and composite materials.
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