Issue 20, 2019, Issue in Progress
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RSC Advances

The design and fabrication of a multilayered graded GNP/Ni/PMMA nanocomposite for enhanced EMI shielding behavior†

Hye Ji Im,a   Jae Young Oh,c   Seongwoo Ryub  and  Soon Hyung Hong ORCID logo *a  

* Corresponding authors

a Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology (KAIST), 291 Daehak-ro, Yuseong-gu, Daejeon, Republic of Korea
E-mail: shhong@kaist.ac.kr
Tel: +82 42 350 3327

b Department of Advanced Materials Engineering, The University of Suwon, 17, Wauan-gil, Bongdam-eup, Hwaseong-si, Gyeonggi-do, Republic of Korea

c SK Hynix Inc, 2091, Gyeongchung-daero, Bubal-eub, Icheon-si, Gyeonggi-do, Republic of Korea

Abstract

A multilayered graded structure can maximize the electromagnetic interference (EMI) shielding properties of a nanocomposite for a specific amount of a conductive filler in a polymer matrix. In this study, multilayered graded nanocomposites of graphene nanoplatelet (GNP)/Ni/polymethyl methacrylate (PMMA) were developed to achieve enhanced EMI shielding behavior. Both multilayered and monolayered nanocomposites were fabricated by controlling the compositions of GNP/Ni in the PMMA matrix. The contributions of the multilayered nanocomposite to EMI shielding were investigated and compared with the shielding effectiveness of the monolayered nanocomposite. The multilayered nanocomposite shows enhanced shielding effectiveness of around 61 dB in the X-band, which is more than three orders of magnitude higher than that of the monolayered nanocomposite. It has been confirmed that the measurements of reflection, absorption and total shielding effectiveness are in good accordance with the theoretically calculated results. The primary shielding mechanism was absorption due to conductive dissipation. The enhanced absorption of electromagnetic waves is attributed to an abrupt increase in the conductivity between layers in the direction of wave propagation in a multilayered nanocomposite due to impedance matching with the air and internal reflection between layers.

Graphical abstract: The design and fabrication of a multilayered graded GNP/Ni/PMMA nanocomposite for enhanced EMI shielding behavior

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Article information

DOI
https://doi.org/10.1039/C9RA00573K
Article type
Paper
Submitted
22 Jan 2019
Accepted
19 Mar 2019
First published
10 Apr 2019
This article is Open Access
Creative Commons BY-NC license

RSC Adv., 2019,9, 11289-11295

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The design and fabrication of a multilayered graded GNP/Ni/PMMA nanocomposite for enhanced EMI shielding behavior

H. J. Im, J. Y. Oh, S. Ryu and S. H. Hong, RSC Adv., 2019, 9, 11289 DOI: 10.1039/C9RA00573K

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