Observation of zigzag and armchair edges of graphite using scanning tunneling microscopy and spectroscopy
Observation of zigzag and armchair edges of graphite using scanning tunneling microscopy and spectroscopy
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DOI：
10.1103/physrevb.71.193406
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发表时间：
2005-05-01
影响因子：
3.7
通讯作者：
Kaburagi, Y
中科院分区：
文献类型：
--
作者：
Kobayashi, Y;Fukui, K;Kaburagi, Y
通过环境和超高真空（UHV）扫描隧道显微镜和扫描隧道光谱的观察，揭示了石墨中存在与结构相关的边缘态。在氢化之字形（扶手椅）边缘上，在特高压下，在费米能级附近（局部态密度峰值的Vs类似于30 mV）可以观察到（没有）亮点和（根3 X根3）R30度超晶格。证明锯齿形边缘对边缘状态负责，尽管在空气中锯齿形边缘和扶手椅边缘之间没有明显的区别。然而，即使在氢化扶手椅边缘，在缺陷点上也可以观察到亮点，在缺陷点上，扶手椅边缘形成了部分之字形边缘。
The presence of structure-dependent edge states of graphite is revealed by both ambient and ultrahigh-vacuum (UHV) scanning tunneling microscopy and scanning tunneling spectroscopy observations. On a hydrogenated zigzag (armchair) edge, bright spots are (are not) observed together with a (root 3 X root 3)R30 degrees super-lattice near the Fermi level (Vs similar to-30 mV for a peak of the local density of states) under UHV. demonstrating that a zigzag edge is responsible for the edge states, although there is no appreciable difference between as-prepared zigzag and armchair edges in air. Even in the hydrogenated armchair edge, however, bright spots are observed at defect points, at which partial zigzag edges are created in the armchair edge.