Uniform hexagonal graphene flakes and films grown on liquid copper surface
Uniform hexagonal graphene flakes and films grown on liquid copper surface
复制标题
在液态铜表面生长均匀的六角形石墨烯薄片和薄膜
DOI：
10.1073/pnas.1200339109
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发表时间：
2012-05-22
影响因子：
11.1
通讯作者：
Liu, Yunqi
中科院分区：
文献类型：
--
作者：
Geng, Dechao;Wu, Bin;Liu, Yunqi
与石墨烯材料的生产相关的未解决的问题包括需要更好地控制层数、结晶度、尺寸、边缘结构和空间取向，以及更好地理解潜在的机制。在这里，我们报告了一种化学气相沉积方法，该方法允许在液体Cu表面上直接合成均匀的单层、大尺寸（高达10，000 μ m（2））、空间自对准和单晶六方石墨烯片（HGF）及其连续膜。采用液体Cu表面完全消除了固体多晶Cu中的晶界，导致均匀的成核分布和低的石墨烯成核密度，而且还使得HGF能够自组装成紧凑且有序的结构。这些HGF显示出609 +/- 200 Ω的平均二维电阻率和0.96 +/- 0.15 mA/μ m的饱和电流密度，证明了它们良好的导电性和承载高电流密度的能力。
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 mu m(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 Omega and saturation current density of 0.96 +/- 0.15 mA/mu m, demonstrating their good conductivity and capability for carrying high current density.