Directional Electromagnetic Interference Shielding Based on Step-Wise Asymmetric Conductive Networks  

作　　者：Bai Xue Yi Li Ziling Cheng Shengdu Yang Lan Xie Shuhao Qin Qiang Zheng 

机构地区：[1]Department of Polymer Materials and Engineering,College of Materials and Metallurgy,Guizhou University,Guiyang 550025,People’s Republic of China [2]National Engineering Research Center for Compounding and Modification of Polymer Materials,National and Local Joint Engineering Research Center for Functional Polymer Membrane Materials and Membrane Processes,Guiyang 550014,People’s Republic of China [3]College of Polymer Science and Engineering,Zhejiang University,Hangzhou 310027,People’s Republic of China [4]College of Materials Science and Engineering,Taiyuan University of Technology,Taiyuan 030024,People’s Republic of China

出　　处：《Nano-Micro Letters》2022年第1期262-277,共16页纳微快报（英文版）

基　　金：Science and Technology Plan Project of Guizhou Province(No.[2019]1084 and[2018]5781);National Natural Science Foundation of China(No.51963003);The Youth Science and Technology Talent Growth Project of Guizhou Province Education Department(No.[2018]106);Outstanding Youth Program of Guizhou Province(No.20170439178);The Key project of Fundamental research in Guizhou province[2020]1Z044;Scientific Research Project of Introduced Talents of Guizhou University(No.(2017)07)are acknowledged for the financial support.

摘　　要：Some precision electronics such as signal transmitters need to not only emit effective signal but also be protected from the external electromagnetic(EM)waves.Thus,directional electromagnetic interference(EMI)shielding materials(i.e.,when the EM wave is incident from different sides of the sample,the EMI shielding effectiveness(SE)is rather different)are strongly required;unfortunately,no comprehensive literature report is available on this research field.Herein,Nicoated melamine foams(Ni@MF)were obtained by a facile electroless plating process,and multiwalled carbon nanotube(CNT)papers were prepared via a simple vacuum-assisted self-assembly approach.Then,step-wise asymmetric poly(butylene adipate-co-terephthalate)(PBAT)composites consisting of loose Ni@MF layer and compact CNT layer were successfully fabricated via a facile solution encapsulation approach.The step-wise asymmetric structures and electrical conductivity endow the Ni@MF/CNT/PBAT composites with unprecedented directional EMI shielding performances.When the EM wave is incident from Ni@MF layer or CNT layer,Ni@MF-5/CNT-75/PBAT exhibits the total EMI SE(SET)of 38.3 and 29.5 dB,respectively,which illustrates theΔSET of 8.8 dB.This work opens a new research window for directional EMI shielding composites with step-wise asymmetric structures,which has promising applications in portable electronics and next-generation communication technologies.

关 键 词：Solution encapsulation Step-wise asymmetry Directional electromagnetic interference shielding Electrical conductivity Vacuum-assisted self-assembly 

分 类 号：TN03[电子电信—物理电子学] TB34[一般工业技术—材料科学与工程]