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Research Article | Open Access

Multilayer core–shell structured FeNi3@C with enhanced interfacial polarization for microwave absorbers

Shaohan Guo1, Junying Zhang2 ( ), Chengyou Lin1, Jin Ge3, Song Bi4, Zhi-Ling Hou2 ( )
College of Mathematics and Physics, Beijing University of Chemical Technology, Beijing 100029, China
School of Physics and Optoelectronic Engineering, Beijing University of Technology, Beijing 100124, China
National Key Laboratory of Electromagnetic Information Control and Effects, Shenyang Aircraft Design and Research Institute, Shenyang 110035, China
501 Department, Xi’an Research Institute of High-Tech, Xi’an 710025, China
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Graphical Abstract

FeNi3@C composite with a core‒shell structure was constructed by hierarchical interface engineering. The effective absorption bandwidth of FeNi3@C reaches 7.4 GHz with a thickness of only 1.6 mm.

Abstract

Magnetoelectric composites can achieve magneto-electric synergy to optimize impedance matching. However, it is challenging to enhance the broadband absorption performance for thin thickness absorbers. Herein, FeNi3@C composite with magnetic alloy core and N-doped macroporous multilevel layered carbon shell was constructed by hierarchical interface engineering. The uniform multilevel layered carbon shell could induce interfacial polarization and multiple scattering, and further endows enhanced electromagnetic attenuation and optimized impedance matching. An ultra-thin broadband absorber with an effective absorption bandwidth of 7.4 GHz is achieved at a thickness of only 1.6 mm. Moreover, full-band absorption from 2 to 18 GHz at a thickness of 9.8 mm is realized through metastructure design. This work provides an alternative strategy to prepare core–shell structured magnetoelectric composites for ultra-thin and broadband absorbers.

Keywords

covalent organic frameworks (COFs)FeNi3@Ccore‒shell structureinterfacial polarizationimpedance matching

Electronic Supplementary Material

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Nano Research
Volume 18 Issue 2,
February 2025
Article number: 94907151
DOI: 10.26599/NR.2025.94907151
Cite this article:
Guo S, Zhang J, Lin C, et al. Multilayer core–shell structured FeNi3@C with enhanced interfacial polarization for microwave absorbers. Nano Research, 2025, 18(2): 94907151. https://doi.org/10.26599/NR.2025.94907151
Topics:
Carbon compositesCore shell nanoparticlesIron alloys

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Received: 17 October 2024
Revised: 22 November 2024
Accepted: 25 November 2024
Published: 07 January 2025
© The Author(s) 2025. Published by Tsinghua University Press.

This is an open access article under the terms of the Creative Commons Attribution 4.0 International License (CC BY 4.0, https://creativecommons.org/licenses/by/4.0/).
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