Porous N-doped Ni@SiO2/graphene network:Three-dimensional hierarchical architecture for strong and broad electromagnetic wave absorption

Rui Guo ¹Qi Zheng ²Lianjun Wang ²Yuchi Fan ³Wan Jiang⁴

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作者信息

1. State Key Laboratory for Modification of Chemical Fibers and Polymer Materials,College of Materials Science and Engineering,Donghua University,Shanghai 201620,China
2. State Key Laboratory for Modification of Chemical Fibers and Polymer Materials,College of Materials Science and Engineering,Donghua University,Shanghai 201620,China;Engineering Research Center of Advanced Glasses Manufacturing Technology,Ministry of Education,Donghua University,Shanghai 201620,China
3. State Key Laboratory for Modification of Chemical Fibers and Polymer Materials,College of Materials Science and Engineering,Donghua University,Shanghai 201620,China;Institute of Functional Materials,Donghua University,Shanghai 201620,China
4. State Key Laboratory for Modification of Chemical Fibers and Polymer Materials,College of Materials Science and Engineering,Donghua University,Shanghai 201620,China;Institute of Functional Materials,Donghua University,Shanghai 201620,China;Engineering Research Center of Advanced Glasses Manufacturing Technology,Ministry of Education,Donghua University,Shanghai 201620,China
折叠

Abstract

Electromagnetic wave absorber is critical for reducing increasingly serious electromagnetic wave pollu-tion,however,the development of lightweight and broadband microwave absorbers remains a pressing challenge.We report here the rational design and synthesis of N-doped Ni@SiO2/graphene composite con-structed from 3D interconnected porous graphene network and Ni@SiO2 core-shell architecture,which fulfills lightweight and broadband requirements while exhibiting highly efficient electromagnetic wave absorption.The porous graphene network,functioning both as lightweight support and dielectric medi-ator,was synthesized via NaCl template-assisted high-temperature calcination method.Upon uniformly attached with core-shell Ni@SiO2 on the surface,the resulting abundant heterogeneous interfaces con-structed by graphene-Ni and Ni-SiO2 strongly reinforce polarization loss.The presence of low dielectric SiO2 allows facile tuning of the complex permittivity of ternary composite by adjusting coating thick-ness to balance the attenuation ability and impedance matching.Moreover,further N-doping of graphene assists in the optimization of dielectric loss ability.Taking account of the advantages arising from the porous hierarchical architecture,multiple absorption centers and diverse interfaces,the lightweight com-posite exhibits an ultra-strong reflection loss(RL)value of-71.13 dB at 13.76 GHz with a thickness of 2.46 mm and broad effective absorption bandwidth of 7.04 GHz at a low filler content of 15 wt.％.More importantly,the effective absorption range covers 13.28 GHz(4.72-18 GHz)with the optimized thickness of 1.6-5 mm,representing 83％of the whole range of frequencies.Our results demonstrate that the novel 3D porous N-doped Ni@SiO2/graphene network with hierarchical architecture is a promising candidate for high-performance electromagnetic wave absorption.

Key words

3D porous graphene network/Ni@SiO2 core-shell structure/N-doped graphene/Hierarchical architecture/Electromagnetic wave absorption

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基金项目

National Natural Science Foun-dation of China(91963204)

National Natural Science Foun-dation of China(51871053)

Shanghai Pujiang Program(19PJ1400200)

Fundamental Research Funds for the Central Universities(2232019G-07)

Fundamental Research Funds for the Central Universities(2232020A-02)

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

被引量2

参考文献量69

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