Structural coherency of graphene on Ir(111)
Structural coherency of graphene on Ir(111)
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DOI：
10.1021/nl0728874
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发表时间：
2008-02-01
期刊：
影响因子：
10.8
通讯作者：
Michely, Thomas
中科院分区：
文献类型：
--
作者：
Coraux, Johann;N'Diaye, Alpha T.;Michely, Thomas
低压化学气相沉积使人们可以在Ir(111)上生长出高结构质量的单层石墨烯。利用扫描隧道显微镜，我们发现用这种方法制备的石墨烯在阶梯和台阶边缘上表现出显著的大尺度连续的碳排。石墨烯层只包含非常低密度的缺陷。这些是零维缺陷，由七角形-五角形碳原子环组成的刃位错核，我们将其与石墨烯中的小角度面内倾斜边界联系在一起。我们定量地研究了石墨烯在Ir台阶边缘的弯曲。相应的曲率半径与单壁薄壁碳纳米管的典型半径进行了比较。
Low-pressure chemical vapor deposition allows one to grow high structural quality monolayer graphene on Ir(111). Using scanning tunneling microscopy, we show that graphene prepared this way exhibits remarkably large-scale continuity of its carbon rows over terraces and step edges. The graphene layer contains only a very low density of defects. These are zero-dimensional defects, edge dislocation cores consisting of heptagon-pentagon pairs of carbon atom rings, which we relate to small-angle in-plane tilt boundaries in the graphene. We quantitatively examined the bending of graphene across Ir step edges. The corresponding radius of curvature compares to typical radii of thin single-wall carbon nanotubes.