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Two-dimensional (2D) transition metal carbides (MXene) possess attractive conductivity and abundant surface functional groups, providing immense potential in the field of electromagnetic wave (EMW) absorption. However, high conductivity and spontaneous aggregation of MXene suffer from limited EMW response. Inspired by dielectric–magnetic synergy effect, the strategy of decorating MXene with magnetic elements is expected to solve this challenge. In this work, zigzag-like Mo2TiC2–MXene nanofibers (Mo-based MXene (Mo–MXene) NFs) with cross-linked networks are fabricated by hydrofluoric acid (HF) etching and potassium hydroxide (KOH) shearing processes. Subsequently, Co-metal–organic framework (MOF) and derived CoNi layered double hydroxide (LDH) ultrathin nanosheets are grown inside Mo–MXene NFs, and the N-doped carbon matrix anchored by CoNi alloy nanoparticles formed by pyrolysis is firmly embedded in the Mo–MXene NFs network. Benefiting from synergistic effect of highly dispersed small CoNi alloy nanoparticles, a three-dimensional (3D) conductive network assembled by zigzag-like Mo–MXene NFs, numerous N-doped hollow carbon vesicles, and abundant dual heterogeneous interface, the designed Mo–MXene/CoNi–NC heterostructure provides robust EMW absorption ability with a reflection loss (RL) value of −68.45 dB at the thickness (d) of 4.38 mm. The robust EMW absorption performance can be attributed to excellent dielectric loss, magnetic loss, impedance matching (Z), and multiple scattering and reflection triggered by the unique 3D network structure. This work puts up great potential in developing advanced MXene-based EMW absorption devices.


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Construction of dual heterogeneous interface between zigzag-like Mo–MXene nanofibers and small CoNi@NC nanoparticles for electromagnetic wave absorption

Show Author's information Xiaojun Zenga,( )Xiao Jianga,Ya NingaFeiyue Hub,cBingbing Fanb( )
School of Materials Science and Engineering, Jingdezhen Ceramic University, Jingdezhen 333403, China
School of Materials Science & Engineering, Zhengzhou University, Zhengzhou 450001, China
Jiangsu Key Laboratory of Advanced Metallic Materials, School of Materials Science and Engineering, Southeast University, Nanjing 211189, China

† Xiaojun Zeng and Xiao Jiang contributed equally to this work.

Abstract

Two-dimensional (2D) transition metal carbides (MXene) possess attractive conductivity and abundant surface functional groups, providing immense potential in the field of electromagnetic wave (EMW) absorption. However, high conductivity and spontaneous aggregation of MXene suffer from limited EMW response. Inspired by dielectric–magnetic synergy effect, the strategy of decorating MXene with magnetic elements is expected to solve this challenge. In this work, zigzag-like Mo2TiC2–MXene nanofibers (Mo-based MXene (Mo–MXene) NFs) with cross-linked networks are fabricated by hydrofluoric acid (HF) etching and potassium hydroxide (KOH) shearing processes. Subsequently, Co-metal–organic framework (MOF) and derived CoNi layered double hydroxide (LDH) ultrathin nanosheets are grown inside Mo–MXene NFs, and the N-doped carbon matrix anchored by CoNi alloy nanoparticles formed by pyrolysis is firmly embedded in the Mo–MXene NFs network. Benefiting from synergistic effect of highly dispersed small CoNi alloy nanoparticles, a three-dimensional (3D) conductive network assembled by zigzag-like Mo–MXene NFs, numerous N-doped hollow carbon vesicles, and abundant dual heterogeneous interface, the designed Mo–MXene/CoNi–NC heterostructure provides robust EMW absorption ability with a reflection loss (RL) value of −68.45 dB at the thickness (d) of 4.38 mm. The robust EMW absorption performance can be attributed to excellent dielectric loss, magnetic loss, impedance matching (Z), and multiple scattering and reflection triggered by the unique 3D network structure. This work puts up great potential in developing advanced MXene-based EMW absorption devices.

Keywords: electromagnetic wave (EMW) absorption, dual heterogeneous interface, CoNi alloy, zigzag-like Mo–MXene, nanofiber (NF) network

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Publication history

Received: 17 April 2023
Revised: 24 May 2023
Accepted: 24 May 2023
Published: 19 July 2023
Issue date: August 2023

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© The Author(s) 2023.

Acknowledgements

This work was supported by the National Natural Science Foundation of China (No. 22269010), the Jiangxi Provincial Natural Science Foundation (No. 20224BAB214021), the Training Program for Academic and Technical Leaders of Major Disciplines in Jiangxi Province (No. 20212BCJ23020), the Science and Technology Project of Jiangxi Provincial Department of Education (No. GJJ211305), the National Natural Science Foundation of China (No. U2004177), and the Outstanding Youth Fund of Henan Province (No. 212300410081).

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