A Highly Flexible Electromagnetic Interference Shielding Film With Improved Mechanical Properties Using Complexation of Functionalized Reduced Graphene Oxide and Graphene Nanoplate
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A highly flexible electromagnetic interference (EMI) shielding film is prepared by complexing functionalized reduced graphene oxide (FrGO) and graphene nanoplate (GNP) and its mechanical and electrical properties are investigated in this study. FrGO powder is prepared by reducing graphene oxide dispersed in water with a reductant that contains both hydroxyl and amino groups at the ends, followed by precipitation and drying. Poly(amic acid) as a polymeric binder is added to a dispersed solution of FrGO powder and GNP in dimethylacetamide as a solvent. An EMI shielding film based on a complex of FrGO and GNP is prepared via a solvent casting process. In comparison to a reference film based on GNP alone, FrGO/GNP film exhibits improved mechanical properties and flexibility, as well excellent EMI shielding performance. These results are ascribed to exceptional dispersibility and its unique amphiphilic structure of FrGO, which results in a well-defined layered structure of FrGO/GNP film.