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

Authors
Mirkhani, Seyyed AlirezaIqbal, AamirKwon, TaehoonChae, AriKim, DaesinKim, HyerimKim, Seon JoonKim, Myung-KiKoo, Chong Min
Issue Date
2021-04-07
Publisher
American Chemical Society
Citation
ACS Applied Materials & Interfaces, v.13, no.13, pp.15827 - 15836
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 similar to 600 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 mu m, one of the largest EMI shielding values ever reported for graphene at comparable thicknesses.
Keywords
HIGH-ELECTRICAL-CONDUCTIVITY; THERMAL-CONDUCTIVITY; RAMAN-SPECTROSCOPY; HIGH-QUALITY; OXIDE-FILMS; GRAPHITE; ABSORPTION; SHEETS; ROUTE; PAPER; HIGH-ELECTRICAL-CONDUCTIVITY; THERMAL-CONDUCTIVITY; RAMAN-SPECTROSCOPY; HIGH-QUALITY; OXIDE-FILMS; GRAPHITE; ABSORPTION; SHEETS; ROUTE; PAPER; electrochemical exfoliation; graphene; reduction; EMI shielding; multiple reflections
ISSN
1944-8244
URI
https://pubs.kist.re.kr/handle/201004/117142
DOI
10.1021/acsami.0c22920
Appears in Collections:
KIST Article > 2021
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