Open and Closed Edges of Graphene Layers

被引:513
作者
Liu, Zheng [1 ]
Suenaga, Kazu [1 ]
Harris, Peter J. F. [2 ]
Iijima, Sumio [1 ]
机构
[1] Natl Inst Adv Ind Sci & Technol, Nanotube Res Ctr, Tsukuba, Ibaraki 3058565, Japan
[2] Univ Reading, JJ Thomson Phys Lab, Ctr Adv Microscopy, Reading RG6 6AF, Berks, England
关键词
SIMPLE HEXAGONAL GRAPHITE; ELECTRONIC-PROPERTIES; BILAYER GRAPHENE; 1ST-PRINCIPLES; STACKING; SINGLE; SHEETS; FIELD;
D O I
10.1103/PhysRevLett.102.015501
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
Edge structures of thermally treated graphite have been studied by means of atomically resolved high-resolution TEM. The method for the determination of a monolayer or more than one layer graphene sheets is established. A series of tilting experiments proves that the zigzag and armchair edges are mostly closed between adjacent graphene layers, and the number of dangling bonds is therefore minimized. Surprisingly bilayer graphene often exhibits AA stacking and is very hard to distinguish from a single graphene layer. Open edge structures with carbon dangling bonds can be found only in a local area where the closed (folding) edge is partially broken.
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页数:4
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