Abstract
A layered graphene oxide/ethylenediamine (GO/EDA) composite film was developed by exposing aqueous GO liquid crystal (GOLC) coating to EDA vapor and its effects on the gas barrier performance of GO film were systematically investigated. When a GO/EDA coating with a thickness of approximately 1 μm was applied to a neat polyethylene terephthalate (PET) film, the resultant film was highly impermeable to gas molecules, particularly reducing the gas permeance up to 99.6% for He and 98.5% for H2 in comparison to the neat PET film. The gas barrier properties can be attributed to the long diffusion length through stacked GO nanosheets. The EDA can crosslink oxygen-containing groups of GO, enhancing the mechanical properties of the GO/EDA coating with hardness and elastic modulus values up to 1.14 and 28.7 GPa, respectively. By the synergistic effect of the viscoelastic properties of GOLC and the volatility of EDA, this coating method can be applied to complex geometries and EDA intercalation can be spontaneously achieved through the scaffold of the GOLC.
Highlights
A layered graphene oxide/ethylenediamine (GO/EDA) composite film was developed by exposing aqueous GO liquid crystal (GOLC) coating to EDA vapor and its effects on the gas barrier performance of GO film were systematically investigated
The procedure for GO/EDA coating on a target surface is portrayed in Fig. 1A and the corresponding photographic images are shown in Supplementary Fig. S1
After a certain time under EDA vapor treatment, the GO/EDA coated substrate was dried at 25 °C to remove excess water, resulting in the formation of a dense GO/EDA coating
Summary
A layered graphene oxide/ethylenediamine (GO/EDA) composite film was developed by exposing aqueous GO liquid crystal (GOLC) coating to EDA vapor and its effects on the gas barrier performance of GO film were systematically investigated. Graphene is intrinsically flexible, stretchable, and transparent owing to its atomic-scale thickness[6,7] Considering all these advantages, single-layer graphene synthesized by chemical vapor deposition (CVD) was deposited on polymeric substrates or stacked in the form of a multilayer graphene film[8]. CVD graphene could be an ideal gas barrier material, the deposition of defect-free graphene on a large scale onto various substrate geometries remains challenging. The incorporation of impermeable fillers with high aspect ratios effectively enhances the gas barrier performance by increasing the diffusion length of permeating gas m olecules[13]. The fabrication procedure is laborious, the development of an efficient fabrication procedure is imperative to meet the industry r equirements[35]
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