Solid-state reaction induced defects in multi-walled carbon nanotubes for improving microwave absorption properties

Tong Gao ¹Zhengyu Zhang ²Yixing Li ²Yujuan Song ²Huawei Rong ¹Xuefeng Zhang¹

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作者信息

1. Key Laboratory for Anisotropy and Texture of Materials(MOE),School of Materials Science and Engineering,Northeastern University,Shenyang 110819,China;Institute of Advanced Magnetic Materials,College of Materials and Environmental Engineering,Hangzhou Dianzi University,Hangzhou 310012,China
2. Key Laboratory for Anisotropy and Texture of Materials(MOE),School of Materials Science and Engineering,Northeastern University,Shenyang 110819,China
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Abstract

Dielectric polarization performance induced by defect engineering approach has been proved to be an ef-fective way for improving the microwave absorption property of carbon-based materials.Assisting by the solid-state reaction,the structural integrity of multi-walled carbon nanotubes(MWCNTs)would be bro-ken along with the volume expansion and etching process of cobalt oxides.Therefore,the defects could be obtained and result in the enhancement of microwave absorption property.Ascribing to the broken wall structures,the defect-distances(LD)and concentrations(nD)have been optimized to be 9.80 nm and 3.37×1011 cm-2.The minimum reflection loss(RL)had reached-54.6 dB at 4.5 GHz with a thickness of 4.13 mm and the corresponding effective absorption bandwidth(EAB＜-10 dB)was analyzed to be 14.6 GHz.Such enhancement is correlated to the dielectric polarization and the permeability-to-permittivity trans-formation raised from the defect structures and concentrations.The present work demonstrates an effec-tive strategy for tailoring the microwave absorption property of MWCNTs by engineering defect concen-trations,and could be further extended to other carbon-based absorbents.

Key words

MWCNTs/Defect engineering/Microwave absorption/Solid-state reaction/Impedance matching

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基金项目

authors gratefully acknowledge the National Natural Sci-ence Foundation of China(U1704253)

authors gratefully acknowledge the National Natural Sci-ence Foundation of China(U1908220)

Zhejiang Provincial Natural Science Foundation of China(LR18E010001)

National Key Research and Development Program of China(2019YFE0121700)

LiaoNing Revitalization Talents Program(XLYC1807177)

and the Fundamental Research Funds for the Cen-tral Universities(N2102010)

出版年

2022

材料科学技术(英文版)

中国金属学会中国材料研究学会中国科学院金属研究所

材料科学技术(英文版)

CSTPCDCSCDSCI

影响因子：0.657

ISSN：1005-0302

参考文献量66

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