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Nano Research 2022, 15(10): 8705-8713 https://doi.org/10.1007/s12274-022-4820-6
Research Article | Issue | Published: 15 August 2022

Heteroatoms-doped carbon nanocages with enhanced dipolar and defective polarization toward light-weight microwave absorbers

Show Author's Information Hanxiao Xu1,  Guozheng Zhang1,  Yi Wang1,  Yiruo Wang1,  Huanlei Wang2( ),  Ying Huang1,  Panbo Liu1( )
School of Chemistry and Chemical Engineering, Northwestern Polytechnical University, Xi’an 710129, China
School of Materials Science and Engineering, Ocean University of China, Qingdao 266100, China
Keywords:
microwave absorption, hollow structure, heteroatoms, carbon nanocages, dipolar resonance
Topics:
Carbon composites
Cite this article:
Xu H, Zhang G, Wang Y, et al. Heteroatoms-doped carbon nanocages with enhanced dipolar and defective polarization toward light-weight microwave absorbers. Nano Research, 2022, 15(10): 8705-8713. https://doi.org/10.1007/s12274-022-4820-6
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Abstract Full text About this article

Light-weight and exceptional microwave absorption are two vital characteristics for microwave absorbers in practical applications, but still face challenges. Herein, we employ a sacrificial template strategy to fabricate heteroatoms-doped carbon nanocages (CNs) via chemical vapor deposition, in which heteroatoms are simultaneously doped into the carbon frameworks by bubbling flowing source liquid. Compared with CNs, doped heteroatoms, accompanied with the inevitably defective arrangements in the lattice, not only decrease the electrical conductivity and balance the impedance characteristics, but also introduce structural-chemical defects and trigger dominant dipolar/defect polarization. As a result, both the minimum reflection loss (RL,min) and effective absorption bandwidth (EAB) greatly increase at an ultralow filler loading of 5 wt.% owing to internal hollow void and high specific surface area. The RL,min values reach −53.6, −43.2, and −50.1 dB for N-CNs, S-CNs, and N,S-CNs with the corresponding EAB of 4.9, 2.5, and 3.1 GHz, respectively. Furthermore, this work provides an effective strategy for the construction of heteroatoms-doped hollow carbon frameworks in large-scale production and the obtained doped carbon nanocages can be used as light-weight and high-performance microwave absorbers.


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About this article

Heteroatoms-doped carbon nanocages with enhanced dipolar and defective polarization toward light-weight microwave absorbers

Show Author's information Hanxiao Xu1, Guozheng Zhang1, Yi Wang1, Yiruo Wang1, Huanlei Wang2( ), Ying Huang1, Panbo Liu1( )
School of Chemistry and Chemical Engineering, Northwestern Polytechnical University, Xi’an 710129, China
School of Materials Science and Engineering, Ocean University of China, Qingdao 266100, China

Abstract

Light-weight and exceptional microwave absorption are two vital characteristics for microwave absorbers in practical applications, but still face challenges. Herein, we employ a sacrificial template strategy to fabricate heteroatoms-doped carbon nanocages (CNs) via chemical vapor deposition, in which heteroatoms are simultaneously doped into the carbon frameworks by bubbling flowing source liquid. Compared with CNs, doped heteroatoms, accompanied with the inevitably defective arrangements in the lattice, not only decrease the electrical conductivity and balance the impedance characteristics, but also introduce structural-chemical defects and trigger dominant dipolar/defect polarization. As a result, both the minimum reflection loss (RL,min) and effective absorption bandwidth (EAB) greatly increase at an ultralow filler loading of 5 wt.% owing to internal hollow void and high specific surface area. The RL,min values reach −53.6, −43.2, and −50.1 dB for N-CNs, S-CNs, and N,S-CNs with the corresponding EAB of 4.9, 2.5, and 3.1 GHz, respectively. Furthermore, this work provides an effective strategy for the construction of heteroatoms-doped hollow carbon frameworks in large-scale production and the obtained doped carbon nanocages can be used as light-weight and high-performance microwave absorbers.

Keywords: microwave absorption, hollow structure, heteroatoms, carbon nanocages, dipolar resonance

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Publication history
Copyright
Acknowledgements

Publication history

Received: 29 June 2022
Revised: 21 July 2022
Accepted: 22 July 2022
Published: 15 August 2022
Issue date: October 2022

Copyright

© Tsinghua University Press 2022

Acknowledgements

Acknowledgements

This work was supported by the Natural Science Foundation of Shaanxi Province (No. 2022JM-260), the Natural Science Foundation of Shandong Province (No. ZR2020ME038), and the Fundamental Research Funds of the Central Universities (No. G2022KY05109).

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