| 초록 |
Graphene oxide/ethylenediamine (GO/EDA) composite film with gas barrier properties was fabricated by EDA vapor treatment to GO liquid crystal (GOLC). The exposure time of EDA was critical element for controlling the amount of EDA intercalation between GO scaffolds. A GO/EDA coated film with the substrate of polyethylene terephthalate (PET) film was impermeable to gas molecules (He, H2, CO2, N2, and CH4) and the gas permeance was reduced up to 99.6% (He) and 98.5% (H2) in comparison to the neat PET film. This enhanced gas barrier properties can be ascribed to the high tortuosity of aligned GO nanosheets. The stability and the mechanical properties of the GO/EDA film were increased due to the crosslinking between EDA and oxygen-containing groups of GO. Therefore, the presented coating method can be applied to various substrates including three-dimensional structure because of the viscoelastic properties of GOLC and the volatility of EDA. |
