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Electromagnetic interference (EMI) shielding materials have received considerable attention in recent years. The EMI shielding effectiveness (SE) of materials depends on not only their composition but also their microstructures. Among various microstructure prototypes, porous structures provide the advantages of low density and high terahertz wave absorption. In this study, by using carbonised wood (CW) as a template, 1-mm-thick MAX@CW composites (Ti2AlC@CW, V2AlC@CW, and Cr2AlC@CW) with a porous structure were fabricated through the molten salt method. The MAX@CW composites led to the formation of a conductive network and multilayer interface, which resulted in improved EMI SE. The average EMI SE values of the three MAX@CW composites were > 45 dB in the frequency of 0.6-1.6 THz. Among the composites, V2AlC@CW exhibited the highest average EMI SE of 55 dB.


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In-situ growth of MAX phase coatings on carbonised wood and their terahertz shielding properties

Show Author's information Jiaxuan HUANGa,b,cHujie WANdMian LIb,cYiming ZHANGb,cJianfeng ZHUa( )Xuelin LIaWenchao SHUIdYao LIdXiaomeng FANeQiye WENd( )Xu XIAOd( )Qing HUANGb,c( )
School of Shaanxi University of Science and Technology, Xi’an 710021, China
Engineering Laboratory of Advanced Energy Materials, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, China
Qianwan Institute of CNiTECH, Zhongchuangyi Road, Hangzhou Bay District, Ningbo 315336, China
School of Electronic Science and Engineering, State Key Laboratory of Electronic Thin Film and Integrated Devices, University of Electronic Science and Technology of China, Chengdu 610054, China
State Key Laboratory of Solidification Processing, School of Materials Science and Engineering, Northwestern Polytechnical University, Xi’an 710072, China

Abstract

Electromagnetic interference (EMI) shielding materials have received considerable attention in recent years. The EMI shielding effectiveness (SE) of materials depends on not only their composition but also their microstructures. Among various microstructure prototypes, porous structures provide the advantages of low density and high terahertz wave absorption. In this study, by using carbonised wood (CW) as a template, 1-mm-thick MAX@CW composites (Ti2AlC@CW, V2AlC@CW, and Cr2AlC@CW) with a porous structure were fabricated through the molten salt method. The MAX@CW composites led to the formation of a conductive network and multilayer interface, which resulted in improved EMI SE. The average EMI SE values of the three MAX@CW composites were > 45 dB in the frequency of 0.6-1.6 THz. Among the composites, V2AlC@CW exhibited the highest average EMI SE of 55 dB.

Keywords:

MAX phases, biomimics, electromagnetic interference (EMI), terahertz shielding
Received: 24 March 2021 Revised: 29 April 2021 Accepted: 01 June 2021 Published: 04 September 2021 Issue date: December 2021
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Publication history
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Publication history

Received: 24 March 2021
Revised: 29 April 2021
Accepted: 01 June 2021
Published: 04 September 2021
Issue date: December 2021

Copyright

© The Author(s) 2021

Acknowledgements

This study was supported financially by the National Natural Science Foundation of China (Grant Nos. 51902320, 61831012, and U2004212). Qing Huang thanks International Partnership Program of Chinese Academy of Sciences (Grant No. 174433KYSB20190019), the Leading Innovative and Entrepreneur Team Introduction Program of Zhejiang (Grant No. 2019R01003). Mian Li acknowledges the support from the fund of the State Key Laboratory of Solidification Processing in NPU (Grant No. SKLSP201917).

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