title: Uniform hexagonal graphene flakes and films grown on liquid copper surface.
abstract: Unresolved problems associated with the production of graphene materials include the need for greater control over layer number, crystallinity, size, edge structure and spatial orientation, and a better understanding of the underlying mechanisms. Here we report a chemical vapor deposition approach that allows the direct synthesis of uniform single-layered, large-size (up to 10,000 μm(2)), spatially self-aligned, and single-crystalline hexagonal graphene flakes (HGFs) and their continuous films on liquid Cu surfaces. Employing a liquid Cu surface completely eliminates the grain boundaries in solid polycrystalline Cu, resulting in a uniform nucleation distribution and low graphene nucleation density, but also enables self-assembly of HGFs into compact and ordered structures. These HGFs show an average two-dimensional resistivity of 609 ± 200 Ω and saturation current density of 0.96 ± 0.15 mA/μm, demonstrating their good conductivity and capability for carrying high current density.
authors.affiliation: Beijing National Laboratory for Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, People's Republic of China.
authors.forename: Dechao
authors.initials: D
authors.lastname: Geng
authors.forename: Bin
authors.initials: B
authors.lastname: Wu
authors.forename: Yunlong
authors.initials: Y
authors.lastname: Guo
authors.forename: Liping
authors.initials: L
authors.lastname: Huang
authors.forename: Yunzhou
authors.initials: Y
authors.lastname: Xue
authors.forename: Jianyi
authors.initials: J
authors.lastname: Chen
authors.forename: Gui
authors.initials: G
authors.lastname: Yu
authors.forename: Lang
authors.initials: L
authors.lastname: Jiang
authors.forename: Wenping
authors.initials: W
authors.lastname: Hu
authors.forename: Yunqi
authors.initials: Y
authors.lastname: Liu
mesh_terms: D003300:Copper / Q000737:chemistry*; D003460:Crystallization / Q000379:methods*; D004581:Electronics / Q000379:methods*; D006108:Graphite / Q000737:chemistry*; D008422:Materials Testing; D049329:Nanostructures / Q000737:chemistry; D036103:Nanotechnology / Q000379:methods*; D010316:Particle Size; D011791:Quartz / Q000737:chemistry; D013499:Surface Properties
chemical_list: D011791:Quartz; D006108:Graphite; D003300:Copper