Porous N-doped Ni@SiO_(2)/graphene network: Three-dimensional hierarchical architecture for strong and broad electromagnetic wave absorption

作     者：Rui Guo Qi Zheng Lianjun Wang Yuchi Fan Wan Jiang Rui Guo;Qi Zheng;Lianjun Wang;Yuchi Fan;Wan Jiang

作者机构：State Key Laboratory for Modification of Chemical Fibers and Polymer MaterialsCollege of Materials Science and EngineeringDonghua UniversityShanghai 201620China Institute of Functional MaterialsDonghua UniversityShanghai 201620China Engineering Research Center of Advanced Glasses Manufacturing TechnologyMinistry of EducationDonghua UniversityShanghai 201620China 

出 版 物：《Journal of Materials Science & Technology》 (材料科学技术（英文版）)

年 卷 期：2022年第106卷第11期

页      面：108-117页

核心收录：

学科分类：08[工学] 080501[工学-材料物理与化学] 0805[工学-材料科学与工程（可授工学、理学学位）] 

基　　金：supported by the National Natural Science Foundation of China (Nos.91963204 and 51871053) Shanghai Pujiang Program (No.19PJ1400200) the Fundamental Research Funds for the Central Universities (Nos.2232019G-07 and 2232020A-02) 

主　　题：3D porous graphene network Ni@SiO_(2)core-shell structure N-doped graphene Hierarchical architecture Electromagnetic wave absorption 

摘      要：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 *** report here the rational design and synthesis of N-doped Ni@SiO_(2)/graphene composite con-structed from 3D interconnected porous graphene network and Ni@SiO_(2) core-shell architecture,which fulfills lightweight and broadband requirements while exhibiting highly efficient electromagnetic wave *** porous graphene network,functioning both as lightweight support and dielectric medi-ator,was synthesized via NaCl template-assisted high-temperature calcination *** uniformly attached with core-shell Ni@SiO_(2) on the surface,the resulting abundant heterogeneous interfaces con-structed by graphene-Ni and Ni-SiO_(2) strongly reinforce polarization *** presence of low dielectric SiO_(2) allows facile tuning of the complex permittivity of ternary composite by adjusting coating thick-ness to balance the attenuation ability and impedance ***,further N-doping of graphene assists in the optimization of dielectric loss *** 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 *** results demonstrate that the novel 3D porous N-doped Ni@SiO_(2)/graphene network with hierarchical architecture is a promising candidate for high-performance electromagnetic wave absorption.