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Nano Research 2023, 16(8): 11084-11095 https://doi.org/10.1007/s12274-023-5511-7
Research Article | Issue | Published: 02 March 2023

A finite oxidation strategy for customizing heterogeneous interfaces to enhance magnetic loss ability and microwave absorption of Fe-cored carbon microcapsules

Show Author's Information Meixi Zhang1,§,  Laisen Wang2,§,  Susu Bao1,  Zhijia Song1,  Wenjiao Chen1,  Zhiyuan Jiang1( ),  Zhaoxiong Xie1,  Lansun Zheng1
State Key Laboratory for Physical Chemistry of Solid Surfaces, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, China
College of Materials, Xiamen University, Xiamen 361005, China

§ Meixi Zhang and Laisen Wang contributed equally to this work.

Keywords:
microwave absorption, interface polarization, yolk–shell structure, magnetic loss, heterogeneous interfaces, finite oxidation
Topics:
Core shell nanoparticlesMagnetic propertiesMicrospheresNanostructured materials
Cite this article:
Zhang M, Wang L, Bao S, et al. A finite oxidation strategy for customizing heterogeneous interfaces to enhance magnetic loss ability and microwave absorption of Fe-cored carbon microcapsules. Nano Research, 2023, 16(8): 11084-11095. https://doi.org/10.1007/s12274-023-5511-7
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Abstract Full text Electronic supplementary material About this article

Metallic iron particles are of great potential for microwave absorption materials due to their strong magnetic loss ability. However, the oxidation susceptibility of metallic iron particles in the atmospheric environment is regarded as a major factor causing performance degradation. Although many efforts have been developed to avoid their oxidation, whether partial surface oxidized iron particles can improve the microwave absorbing performance is rarely concerned. In order to explore the effect of partial surface oxidation of iron on its properties, the designed yolk–shelled (Fe/FeOx)@C composites with multiple heterointerfaces were synthesized via an in-situ polymerization and a finite reduction–oxidation process of Fe2O3 ellipsoids. The performance enhancement mechanisms of Fe/FeOx heterointerfaces were also elaborated. It is demonstrated that the introduction of Fe-based heterogeneous interfaces can not only enhance the dielectric loss, but also increase the imaginary part of the permeability in the higher frequency range to strengthen the magnetic loss ability. Meanwhile, the yolk–shell structure can effectively improve impedance matching and enhance microwave absorption performances via increasing multiple reflection and scattering behaviors of incident microwaves. Compared to Fe@C composite, the effective absorption (reflection loss (RL) < −10 dB) bandwidth of the optimized (Fe/FeOx)@C-2 increases from 5.7 to 7.3 GHz (10.7–18.0 GHz) at a same matching thickness of 2 mm, which can completely cover Ku-band. This work offers a good perspective for the enhancement of magnetic loss ability and microwave absorption performance of Fe-based microwave absorption materials with promising practical applications.


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About this article

A finite oxidation strategy for customizing heterogeneous interfaces to enhance magnetic loss ability and microwave absorption of Fe-cored carbon microcapsules

Show Author's information Meixi Zhang1,§, Laisen Wang2,§, Susu Bao1, Zhijia Song1, Wenjiao Chen1, Zhiyuan Jiang1( ), Zhaoxiong Xie1, Lansun Zheng1
State Key Laboratory for Physical Chemistry of Solid Surfaces, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, China
College of Materials, Xiamen University, Xiamen 361005, China

§ Meixi Zhang and Laisen Wang contributed equally to this work.

Abstract

Metallic iron particles are of great potential for microwave absorption materials due to their strong magnetic loss ability. However, the oxidation susceptibility of metallic iron particles in the atmospheric environment is regarded as a major factor causing performance degradation. Although many efforts have been developed to avoid their oxidation, whether partial surface oxidized iron particles can improve the microwave absorbing performance is rarely concerned. In order to explore the effect of partial surface oxidation of iron on its properties, the designed yolk–shelled (Fe/FeOx)@C composites with multiple heterointerfaces were synthesized via an in-situ polymerization and a finite reduction–oxidation process of Fe2O3 ellipsoids. The performance enhancement mechanisms of Fe/FeOx heterointerfaces were also elaborated. It is demonstrated that the introduction of Fe-based heterogeneous interfaces can not only enhance the dielectric loss, but also increase the imaginary part of the permeability in the higher frequency range to strengthen the magnetic loss ability. Meanwhile, the yolk–shell structure can effectively improve impedance matching and enhance microwave absorption performances via increasing multiple reflection and scattering behaviors of incident microwaves. Compared to Fe@C composite, the effective absorption (reflection loss (RL) < −10 dB) bandwidth of the optimized (Fe/FeOx)@C-2 increases from 5.7 to 7.3 GHz (10.7–18.0 GHz) at a same matching thickness of 2 mm, which can completely cover Ku-band. This work offers a good perspective for the enhancement of magnetic loss ability and microwave absorption performance of Fe-based microwave absorption materials with promising practical applications.

Keywords: microwave absorption, interface polarization, yolk–shell structure, magnetic loss, heterogeneous interfaces, finite oxidation

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Publication history
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Acknowledgements

Publication history

Received: 09 December 2022
Revised: 10 January 2023
Accepted: 16 January 2023
Published: 02 March 2023
Issue date: August 2023

Copyright

© Tsinghua University Press 2023

Acknowledgements

Acknowledgements

This work was supported by the National Natural Science Foundation of China (Nos. 21771151 and 21931009) and the Natural Science Foundation of Fujian Province of China (No. 2022J01042).

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