TY - JOUR
T1 - Reduction of Electrochemically Exfoliated Graphene Films for High-Performance Electromagnetic Interference Shielding
AU - Mirkhani, Seyyed Alireza
AU - Iqbal, Aamir
AU - Kwon, Taehoon
AU - Chae, Ari
AU - Kim, Daesin
AU - Kim, Hyerim
AU - Kim, Seon Joon
AU - Kim, Myung Ki
AU - Koo, Chong Min
N1 - 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.
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.
KW - EMI shielding
KW - electrochemical exfoliation
KW - graphene
KW - multiple reflections
KW - reduction
UR - http://www.scopus.com/inward/record.url?scp=85104047842&partnerID=8YFLogxK
U2 - 10.1021/acsami.0c22920
DO - 10.1021/acsami.0c22920
M3 - Article
C2 - 33779141
AN - SCOPUS:85104047842
SN - 1944-8244
VL - 13
SP - 15827
EP - 15836
JO - ACS applied materials & interfaces
JF - ACS applied materials & interfaces
IS - 13
ER -