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Nano Research 2020, 13(1): 72-78 https://doi.org/10.1007/s12274-019-2574-6
Research Article | Issue | Published: 04 December 2019

In situ dynamics response mechanism of the tunable length-diameter ratio nanochains for excellent microwave absorber

Show Author's Information Wenbin You,  Ke Pei,  Liting Yang,  Xiao Li,  Xiaofeng Shi,  Xuefeng Yu,  Huiqiao Guo,  Renchao Che( )
Laboratory of Advanced Materials, Department of Materials Science and Collaborative, Innovation Center of Chemistry for Energy Materials (iChem), Fudan University, 220 Handan Road, Shanghai 200433, China
Keywords:
microwave absorption, magnetic materials, in situ transmission electron microscopy (TEM), cobalt nanochain, dynamic response
Topics:
CobaltHigh resolution transmission electron microscopyMagnetic materials
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You W, Pei K, Yang L, et al. In situ dynamics response mechanism of the tunable length-diameter ratio nanochains for excellent microwave absorber. Nano Research, 2020, 13(1): 72-78. https://doi.org/10.1007/s12274-019-2574-6
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Abstract Full text Electronic supplementary material About this article

Faster response benefits the high-performance of magnetic material in various live applications. Hence, enhancing response speed toward the applied field via engineering advantages in structures is highly desired. In this paper, the precise synthesis of Co nanochain with the tunable length-diameter ratio is realized via a magnetic-field-guided assembly approach. The Co nanochain exhibits enhanced microwave absorption performance (near to -60 dB, layer thickness 2.2 mm) and broader effective absorption bandwidth (over 2/3 of total S, C, X, Ku bands). Furthermore, the simulated dynamic magnetic response reveals that the domain motion in 1D chain is faster than that in 0D nanoparticle, which is the determining factor of magnetic loss upgrade. Meanwhile, based on the controllable magnetic field experiment via in situ transmission electron microscopy, the association between magnetic response and microstructure is first present at the nanometer-level. The real and imaginary parts of relative complex permeability are determined by the domain migration confined inside Co nanochain and the magnetic flux field surrounded outside Co nanochain, respectively. Importantly, these findings can be extended to the novel design of microwave absorbers and promising candidates of magnetic carriers based on 1D structure.


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Electronic supplementary material
About this article

In situ dynamics response mechanism of the tunable length-diameter ratio nanochains for excellent microwave absorber

Show Author's information Wenbin You, Ke Pei, Liting Yang, Xiao Li, Xiaofeng Shi, Xuefeng Yu, Huiqiao Guo, Renchao Che( )
Laboratory of Advanced Materials, Department of Materials Science and Collaborative, Innovation Center of Chemistry for Energy Materials (iChem), Fudan University, 220 Handan Road, Shanghai 200433, China

Abstract

Faster response benefits the high-performance of magnetic material in various live applications. Hence, enhancing response speed toward the applied field via engineering advantages in structures is highly desired. In this paper, the precise synthesis of Co nanochain with the tunable length-diameter ratio is realized via a magnetic-field-guided assembly approach. The Co nanochain exhibits enhanced microwave absorption performance (near to -60 dB, layer thickness 2.2 mm) and broader effective absorption bandwidth (over 2/3 of total S, C, X, Ku bands). Furthermore, the simulated dynamic magnetic response reveals that the domain motion in 1D chain is faster than that in 0D nanoparticle, which is the determining factor of magnetic loss upgrade. Meanwhile, based on the controllable magnetic field experiment via in situ transmission electron microscopy, the association between magnetic response and microstructure is first present at the nanometer-level. The real and imaginary parts of relative complex permeability are determined by the domain migration confined inside Co nanochain and the magnetic flux field surrounded outside Co nanochain, respectively. Importantly, these findings can be extended to the novel design of microwave absorbers and promising candidates of magnetic carriers based on 1D structure.

Keywords: microwave absorption, magnetic materials, in situ transmission electron microscopy (TEM), cobalt nanochain, dynamic response

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Acknowledgements

Publication history

Received: 09 October 2019
Revised: 09 November 2019
Accepted: 20 November 2019
Published: 04 December 2019
Issue date: January 2020

Copyright

© Tsinghua University Press and Springer-Verlag GmbH Germany, part of Springer Nature 2019

Acknowledgements

This work was supported by the Ministry of Science and Technology of China (973 Project) (No. 2018YFA0209102) and the National Natural Science Foundation of China (Nos. 11727807, 51725101, 51672050, and 61790581).

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