Reduction of Electrochemically Exfoliated Graphene Films for High-Performance Electromagnetic Interference Shielding
| Autor: | Aamir Iqbal, Chong Min Koo, Ari Chae, Myung Ki Kim, Daesin Kim, Hyerim Kim, Taehoon Kwon, Seon Joon Kim, Seyyed Alireza Mirkhani |
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| Rok vydání: | 2021 |
| Předmět: |
Materials science
Graphene business.industry 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology Microstructure 01 natural sciences Exfoliation joint Electromagnetic interference 0104 chemical sciences law.invention EMI law Electrical resistivity and conductivity Electromagnetic shielding Optoelectronics General Materials Science 0210 nano-technology business Microwave |
| Zdroj: | ACS Applied Materials & Interfaces. 13:15827-15836 |
| ISSN: | 1944-8252 1944-8244 |
| Popis: | 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 ∼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 μm, one of the largest EMI shielding values ever reported for graphene at comparable thicknesses. |
| Databáze: | OpenAIRE |
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