Regulation of impedance matching feature and electronic structure of nitrogen-doped carbon nanotubes for high-performance electromagnetic wave absorption  

作　　者：Fenghui Cao Jia Xu Minjie Liu Feng Yan Qiuyun Ouyang Xitian Zhang Xiaoli Zhang Yujin Chen 

机构地区：[1]Key Laboratory of In-Fiber Integrated Optics,College of Physics and Optoelectronic Engineering,Harbin Engineering University,Harbin 150001,China [2]School of Mechatronic Engineering,Daqing Normal University,Daqing 163712,China [3]Key Laboratory for Photonic and Electronic Bandgap Materials,Ministry of Education,and School of Physics and Electronic Engineering,Harbin Normal University,Harbin 150025,China [4]School of Materials Science and Engineering,Zhengzhou University,Zhengzhou 450001,China

出　　处：《Journal of Materials Science & Technology》2022年第13期1-9,共9页材料科学技术（英文版）

基　　金：financially supported by the National Natural Science Foundation China(Grant No.51972077);the Fundamental Research Funds for the Central Universities(Grant Nos.3072020CF2518,3072020CFT2505,3072021CFT2506,3072021CF2523 and 3072021CF2524);Heilongjiang Touyan Innovation Team Program,Natural Science Foundation of Daqing Normal University(Grant No.19ZR05);Daqing City Directive Science and Technology Plan Project(Grant No.zd-2020-04);Heilongjiang Provincial Natural Resources Foundation Joint Guide Project(Grant No.LH2020E098)。

摘　　要：In this study,we developed a facile method to fabricate three-dimensional(3D)structures composed of FeNi alloy nanoparticles encapsulated in N-doped carbon nanotubes that grafted on the SiO_(2) spheres(Fe_(x)Ni_(y)@NCNT@SiO_(2))for electromagnetic wave(EMW)absorption.The experimental results suggest that the impedance matching characteristic can be tuned by the introduction of SiO_(2) spheres in the 3D structure.Density functional theory(DFT)calculations showed that the introduction of Ni improved the polarization and conductive losses of the Fe_(x)Ni_(y)@NCNT@SiO_(2).As a result,the optimal 3D structure exhibits excellent EMW absorption property with a reflection loss and effective absorption bandwidth are-49.39 dB and 4.32 GHz,respectively,even though the matching thickness is only 1.6 mm,superior to most magnetic carbon-based composites.Thus,our current approach opens up an effective way to the development of low-cost,high-performance EMW absorbers.

关 键 词：FeNi alloy CNTS SILICA Nitrogen doping Electromagnetic wave absorption 

分 类 号：TQ127[化学工程—无机化工] TB3[一般工业技术—材料科学与工程]