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 journalArticlepeer-review

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 languageEnglish
Pages (from-to)15827-15836
Number of pages10
JournalACS Applied Materials and Interfaces
Volume13
Issue number13
DOIs
Publication statusPublished - 2021 Apr 7

Keywords

  • electrochemical exfoliation
  • EMI shielding
  • graphene
  • multiple reflections
  • reduction

ASJC Scopus subject areas

  • Materials Science(all)

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