Nanofiber-reinforced CoFe_(2)O_(4)/graphene composite aerogel as broadband electromagnetic wave absorber  

作　　者：Shuang Xu Qinghai Liu Zhaoliang Yu Lijun Li Xiaodong Dai Shuyan Yu Congju Li 

机构地区：[1]School of Energy and Environmental Engineering,University of Science and Technology Beijing,Beijing 100083,China [2]State Key Laboratory of NBC Protection for Civilian,Beijing 102205,China [3]College of Textiles,Donghua University,Shanghai 201620,China

出　　处：《Nano Research》2025年第2期464-476,共13页纳米研究(英文版)

基　　金：The authors gratefully acknowledge the financial support for this work by the Beijing Municipal Key Fund Project(No.LZY2023043014);the Fundamental Research Funds for the Central Universities(No.06500100).

摘　　要：Graphene aerogel(GA)is a promising lightweight and high-performance material for electromagnetic wave absorption due to its ultra-light mass.However,the impedance matching and attenuation capabilities of GA are limited by its high conductivity and constrained attenuation paths.To address this limitation,magnetic materials are often combined with GA to enhance both impedance matching and attenuation performance.Nevertheless,little attention has been given to the influence of magnetic materials with varying morphologies on the electromagnetic wave absorption(EMA)properties.In this study,CoFe_(2)O_(4) nanofibers were prepared via electrospinning technology as an alternativeto commercial CoFe_(2)0_(4) nanoparticles.Subsequently,CoFe_(2)O_(4)@GA composites were synthesized through a hydrothermal reaction in a graphene oxide(GO)solution.Moreover,the inclusion of ethylene glycol in the GO solution helped regulate the volume shrinkage of GA after the adding of CoFe_(2)O_(4),thus preventing structural instability and fragmentation.The introduction of a small quantity of magnetic nanofibers significantly enhanced the EMA performance of the CoFe_(2)O_(4)@GA composite,increasing the strongest absorption from-34.5 to-53.5 dB and widening the maximum effective absorption bandwidth(EAB)from 8.0 to 8.7 GHz.Finally,the study revealed that CoFe_(2)O_(4) nanofibers outperformed nanoparticles in electromagnetic wave loss mechanisms,including magnetic coupling,magnetic resonance,eddy current loss,and interface polarization.This finding provides valuable insights for the selection and optimization of magnetic component morphologies in EMA materials.

关 键 词：graphene aerogel NANOFIBER SELF-ASSEMBLED composite materials magnetic coupling electromagnetic absorption 

分 类 号：TB3[一般工业技术—材料科学与工程]