Issue

Vol. 14 (2022)

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

https://doi.org/10.1007/s40820-021-00743-y
Bai Xue
Department of Polymer Materials and Engineering, College of Materials and Metallurgy, Guizhou University, Guiyang 550025, People’s Republic of China
Yi Li
Department of Polymer Materials and Engineering, College of Materials and Metallurgy, Guizhou University, Guiyang 550025, People’s Republic of China
Ziling Cheng
Department of Polymer Materials and Engineering, College of Materials and Metallurgy, Guizhou University, Guiyang 550025, People’s Republic of China
Shengdu Yang
Department of Polymer Materials and Engineering, College of Materials and Metallurgy, Guizhou University, Guiyang 550025, People’s Republic of China
Lan Xie
Department of Polymer Materials and Engineering, College of Materials and Metallurgy, Guizhou University, Guiyang 550025, People’s Republic of China
Shuhao Qin
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
Qiang Zheng
Department of Polymer Materials and Engineering, College of Materials and Metallurgy, Guizhou University, Guiyang 550025, People’s Republic of China

Corresponding Author: Qiang Zheng

zhengqiang@zju.edu.cn

Nano-Micro Letters, Vol. 14 (2022), Article Number: 16

Abstract

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, Ni-coated 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 the ΔSET 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.


Highlights:


1 Ni@MF/CNT/PBAT composites with step-wise asymmetric structures are fabricated via a facile solution encapsulation approach.
2 The composites exhibit the unprecedented directional electromagnetic interference shielding performances (ΔSET = 8.8 dB), which are further verified by an actual application measurement in a remote controlled toy car system.

Keywords

Solution encapsulation Step-wise asymmetry Directional electromagnetic interference shielding Electrical conductivity Vacuum-assisted self-assembly
Xue, Bai, Yi Li, Ziling Cheng, Shengdu Yang, Lan Xie, Shuhao Qin, and Qiang Zheng. 2021. “Directional Electromagnetic Interference Shielding Based on Step-Wise Asymmetric Conductive Networks”. Nano-Micro Letters 14 (December):16. https://doi.org/10.1007/s40820-021-00743-y.
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