Introducing Rich Heterojunction Surfaces to Enhance the High-Frequency Electromagnetic Attenuation Response of Flexible Fiber-Based Wearable Absorbers

IF 17.2 1区工程技术 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Advanced Fiber Materials Pub Date : 2024-03-07 DOI:10.1007/s42765-024-00387-8

He Han, Zhichao Lou, Qiuyi Wang, Lei Xu, Yanjun Li

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Abstract

With the rapid development of 5G communication and artificial intelligence (AI) technology, electromagnetic radiation pollution is emerging as a serious issue. Achieving both uniform dispersion and controllable loading of absorbers and obtaining functional wearable absorbers with high electromagnetic response are still considered great challenges. In this work, a flexible fiber-based absorber (VF_T2h/MF/PPy) with a rich interfacial polarization relaxation was obtained by integrating heterostructures and performing nanostructure design and introducing π-conjugated polymer components. Electrons migrated and redistributed between nanoparticles and nitrogen-carbon lattices with different electrostatic states. The formed heterogeneous interface promoted the electromagnetic attenuation response in the high-frequency region. More specifically, the effective absorption frequency bandwidth was up to 5.6 GHz (corresponds to the Ku-band with a matching thickness range up to 2.55–4.85 mm). Impressively, the abundant modification sites on the fiber surface adjusted the content and dispersion of the magnetic nanoparticles and enhanced the vector superposition effect generated by the structural distribution of the magnetic/electric fields. The introduction of dielectric components improved the interfacial polarization strength of the heterojunction surface and the synergistic effect of the dipolar polarization. The high-efficiency electromagnetic attenuation performance was attributed to multiple loss mechanisms. Our work provides a reference path for the microscopic regulation of the high-efficiency electromagnetic response mechanism of fiber-based flexible absorbing materials.

Graphical Abstract

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引入丰富的异质结表面，增强基于柔性纤维的可穿戴吸收器的高频电磁衰减响应

随着 5G 通信和人工智能（AI）技术的快速发展，电磁辐射污染正成为一个严重问题。如何实现吸收体的均匀分散和可控负载，并获得具有高电磁响应的功能性可穿戴吸收体，仍被认为是一项巨大的挑战。在这项工作中，通过集成异质结构、进行纳米结构设计并引入π共轭聚合物成分，获得了一种具有丰富界面极化弛豫的柔性纤维基吸收器（VFT2h/MF/PPy）。电子在具有不同静电状态的纳米粒子和氮碳晶格之间迁移和再分布。形成的异质界面促进了高频区域的电磁衰减响应。更具体地说，有效吸收频率带宽高达 5.6 GHz（相当于 Ku 波段，匹配厚度范围高达 2.55-4.85 mm）。令人印象深刻的是，光纤表面丰富的改性点调整了磁性纳米粒子的含量和分散性，增强了磁场/电场结构分布产生的矢量叠加效应。电介质成分的引入提高了异质结表面的界面极化强度和双极化协同效应。高效电磁衰减性能归因于多种损耗机制。我们的工作为光纤基柔性吸波材料高效电磁响应机制的微观调控提供了参考路径。图文摘要

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来源期刊

Advanced Fiber Materials Multiple-

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.