Graphite Wrapped FeNi_(3)/Co with Carbon Nanotubes Anchored on MgO@Carbon Fiber Reinforcements via Continuous Fabrication for High-Efficiency Microwave Attenuation  

作　　者：Chengjuan Wang Haotian Jiang Xianzhao Cao Xu He Xuanbo Chen Bowen Cui Xiaodan Xu Yanxiang Wang Chengguo Wang 

机构地区：[1]Key Laboratory for Liquid‒Solid Structural Evolution and Processing of Materials(Ministry of Education),Shandong University,Jinan 250061,China [2]Carbon Fiber Engineering Research Center,School of Materials Science and Engineering,Shandong University,Jinan 250061,China [3]School of Materials Science and Engineering,Shandong University,Jinan 250061,China

出　　处：《Advanced Fiber Materials》2024年第5期1640-1656,共17页先进纤维材料（英文）

基　　金：supported by the Natural Science Foundation of Shandong Prov-ince(ZR2021ME194,2022TSGC2448,2023TSGC0545);the Key Technology Research and Development Program of Shandong Province(2021ZLGX01).

摘　　要：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 FeNi_(3)/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 sup-presses 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 polariza-tion 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 FeNi_(3)/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 attractiv

关 键 词：MgO nanofilm Heterogeneous structure Microwave absorption Mechanical property Electromagnetic interference shielding 

分 类 号：TB383[一般工业技术—材料科学与工程]