Reduction of Electrochemically Exfoliated Graphene Films for High-Performance Electromagnetic Interference Shielding

Seyyed Alireza Mirkhani; Aamir Iqbal; Taehoon Kwon; Ari Chae; Daesin Kim; Hyerim Kim; Seon Joon Kim; Myung Ki Kim; Chong Min Koo

doi:10.1021/acsami.0c22920

Reduction of Electrochemically Exfoliated Graphene Films for High-Performance Electromagnetic Interference Shielding

Seyyed Alireza Mirkhani, Aamir Iqbal, Taehoon Kwon, Ari Chae, Daesin Kim, Hyerim Kim, Seon Joon Kim, Myung Ki Kim, Chong Min Koo

Research output: Contribution to journal › Article › peer-review

31 Citations (Scopus)

Abstract

Two-dimensional graphene is of great interest for electromagnetic interference (EMI) shielding owing to its inherent electrical conductivity, lightweight, and excellent mechanical flexibility even at minor thicknesses. However, the complex synthesis and quality-control difficulties limit its application. In this study, we demonstrate that electrochemically exfoliated graphene (EEG) with post-reduction treatment is a promising candidate for lightweight EMI shielding materials. A facile electrochemical exfoliation approach produces a high-quality multilayer graphene with a high electrical conductivity of μ600 S cm-1, owing to its low degree of oxidation. The reduction of EEG by three different methods, including chemical, thermal, and microwave treatments, causes the removal of surface functional groups as well as significant changes in the microstructure of the final films. The reduced graphene films by microwaves, which are driven by the improved electrical conductivity and large volume expansion, exhibit an EMI shielding effectiveness of 108 dB at a thickness of 125 μm, one of the largest EMI shielding values ever reported for graphene at comparable thicknesses.

Original language	English
Pages (from-to)	15827-15836
Number of pages	10
Journal	ACS Applied Materials and Interfaces
Volume	13
Issue number	13
DOIs	https://doi.org/10.1021/acsami.0c22920
Publication status	Published - 2021 Apr 7

Bibliographical note

Funding Information:
This work was supported by a grant from the Basic Science Research Program (2017R1A2B3006469) through the National Research Foundation of Korea, funded by the Ministry of Science, ICT and Future Planning; and the Construction Technology Research Project (19SCIP-B146646-02), funded by the Ministry of Land, Infrastructure, and Transport, Republic of Korea. This work was partially supported by KU-KIST Research and KIST Internal Research programs, funded by the Korea Institute of Science and Technology (KIST).

Publisher Copyright:
© 2021 American Chemical Society.

Keywords

EMI shielding
electrochemical exfoliation
graphene
multiple reflections
reduction

ASJC Scopus subject areas

General Materials Science

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10.1021/acsami.0c22920

Cite this

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title = "Reduction of Electrochemically Exfoliated Graphene Films for High-Performance Electromagnetic Interference Shielding",

abstract = "Two-dimensional graphene is of great interest for electromagnetic interference (EMI) shielding owing to its inherent electrical conductivity, lightweight, and excellent mechanical flexibility even at minor thicknesses. However, the complex synthesis and quality-control difficulties limit its application. In this study, we demonstrate that electrochemically exfoliated graphene (EEG) with post-reduction treatment is a promising candidate for lightweight EMI shielding materials. A facile electrochemical exfoliation approach produces a high-quality multilayer graphene with a high electrical conductivity of μ600 S cm-1, owing to its low degree of oxidation. The reduction of EEG by three different methods, including chemical, thermal, and microwave treatments, causes the removal of surface functional groups as well as significant changes in the microstructure of the final films. The reduced graphene films by microwaves, which are driven by the improved electrical conductivity and large volume expansion, exhibit an EMI shielding effectiveness of 108 dB at a thickness of 125 μm, one of the largest EMI shielding values ever reported for graphene at comparable thicknesses. ",

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author = "Mirkhani, {Seyyed Alireza} and Aamir Iqbal and Taehoon Kwon and Ari Chae and Daesin Kim and Hyerim Kim and Kim, {Seon Joon} and Kim, {Myung Ki} and Koo, {Chong Min}",

note = "Funding Information: This work was supported by a grant from the Basic Science Research Program (2017R1A2B3006469) through the National Research Foundation of Korea, funded by the Ministry of Science, ICT and Future Planning; and the Construction Technology Research Project (19SCIP-B146646-02), funded by the Ministry of Land, Infrastructure, and Transport, Republic of Korea. This work was partially supported by KU-KIST Research and KIST Internal Research programs, funded by the Korea Institute of Science and Technology (KIST). Publisher Copyright: {\textcopyright} 2021 American Chemical Society.",

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AU - Mirkhani, Seyyed Alireza

AU - Iqbal, Aamir

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AU - Chae, Ari

AU - Kim, Daesin

AU - Kim, Hyerim

AU - Kim, Seon Joon

AU - Kim, Myung Ki

AU - Koo, Chong Min

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PY - 2021/4/7

Y1 - 2021/4/7

N2 - Two-dimensional graphene is of great interest for electromagnetic interference (EMI) shielding owing to its inherent electrical conductivity, lightweight, and excellent mechanical flexibility even at minor thicknesses. However, the complex synthesis and quality-control difficulties limit its application. In this study, we demonstrate that electrochemically exfoliated graphene (EEG) with post-reduction treatment is a promising candidate for lightweight EMI shielding materials. A facile electrochemical exfoliation approach produces a high-quality multilayer graphene with a high electrical conductivity of μ600 S cm-1, owing to its low degree of oxidation. The reduction of EEG by three different methods, including chemical, thermal, and microwave treatments, causes the removal of surface functional groups as well as significant changes in the microstructure of the final films. The reduced graphene films by microwaves, which are driven by the improved electrical conductivity and large volume expansion, exhibit an EMI shielding effectiveness of 108 dB at a thickness of 125 μm, one of the largest EMI shielding values ever reported for graphene at comparable thicknesses.

AB - Two-dimensional graphene is of great interest for electromagnetic interference (EMI) shielding owing to its inherent electrical conductivity, lightweight, and excellent mechanical flexibility even at minor thicknesses. However, the complex synthesis and quality-control difficulties limit its application. In this study, we demonstrate that electrochemically exfoliated graphene (EEG) with post-reduction treatment is a promising candidate for lightweight EMI shielding materials. A facile electrochemical exfoliation approach produces a high-quality multilayer graphene with a high electrical conductivity of μ600 S cm-1, owing to its low degree of oxidation. The reduction of EEG by three different methods, including chemical, thermal, and microwave treatments, causes the removal of surface functional groups as well as significant changes in the microstructure of the final films. The reduced graphene films by microwaves, which are driven by the improved electrical conductivity and large volume expansion, exhibit an EMI shielding effectiveness of 108 dB at a thickness of 125 μm, one of the largest EMI shielding values ever reported for graphene at comparable thicknesses.

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Reduction of Electrochemically Exfoliated Graphene Films for High-Performance Electromagnetic Interference Shielding

Abstract

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Keywords

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