Abstract
The chemical vapor deposition (CVD) method to obtain tailored graphene as a transparent and flexible gas barrier has been developed. By separating nucleation step from growth, we could reduce early graphene nucleation density and thus induce better stitching between domain boundaries in the second growth step. Furthermore, two step growth in conjunction with electrochemical polishing of Cu foils achieved large graphene domains and improved graphene quality with minimized defects. The performance of resulting graphene as a gas barrier was superior to the graphene obtained by one-step growth on polished or unpolished Cu foils. The CVD graphene reported here could open up the possibility for exploring graphene-based gas barrier due to the minimized density of defect area.
Highlights
Graphene, a single atom thick sheet of sp[2] hybridized carbon atoms arranged in hexagonal lattice, has gained significant interest due to its outstanding physical properties such as mechanical stiffness, very high electrical and thermal conductivity, elasticity, and so on[1,2,3,4,5]
A recent study showed that the corrosion rate of Cu is accelerated by graphene overlayer compared to bare Cu under exposure for long period[20]. This is because line defects and grain boundaries formed at the interfaces between two domains with different crystallographic orientations of polycrystalline Cu foil allow the transfer of gaseous molecules toward arbitrary surface covered by such graphene layer[15]
Three different graphene layers are grown as follows: The first graphene was grown on as-received Cu foil without any treatment by one step growth (1step-w/o electro-chemical polishing (ECP)), the second graphene was grown on electrochemically polished Cu foil by one step growth (1step-ECP) and the third graphene was grown on ECP Cu foil by two step growth (2step-ECP)
Summary
A single atom thick sheet of sp[2] hybridized carbon atoms arranged in hexagonal lattice, has gained significant interest due to its outstanding physical properties such as mechanical stiffness, very high electrical and thermal conductivity, elasticity, and so on[1,2,3,4,5]. Despite the promising properties, CVD graphene layer as a protective gas barrier has been found to result reduced oxidation and corrosion resistance in protecting the metal surfaces12,15,l8,19. This is because line defects and grain boundaries formed at the interfaces between two domains with different crystallographic orientations of polycrystalline Cu foil allow the transfer of gaseous molecules toward arbitrary surface covered by such graphene layer[15].
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