Graphene at the Edge: Stability and Dynamics
Graphene at the Edge: Stability and Dynamics
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DOI：
10.1126/science.1166999
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发表时间：
2009-03-27
期刊：
影响因子：
56.9
通讯作者：
Zettl, A.
中科院分区：
文献类型：
--
作者：
Girit, Caglar Oe;Meyer, Jannik C.;Zettl, A.
虽然材料在表面和边缘的物理学已经被广泛研究，但单个原子在孤立边缘的运动还没有被直接实时观察到。利用一台能够同时实现原子空间分辨率和1秒时间分辨率的透射式电子像差校正显微镜，我们制作了悬浮的单原子层石墨烯中空穴边缘碳原子动力学的电影。随着空穴的增长，记录了键的重排和束流诱导的碳原子抛射。我们研究了边缘重构的机制，并证明了“之字形”边缘构型的稳定性。这项对理想的低维界面--石墨烯中的空穴的研究，展示了边界上原子的复杂行为。
Although the physics of materials at surfaces and edges has been extensively studied, the movement of individual atoms at an isolated edge has not been directly observed in real time. With a transmission electron aberration-corrected microscope capable of simultaneous atomic spatial resolution and 1-second temporal resolution, we produced movies of the dynamics of carbon atoms at the edge of a hole in a suspended, single atomic layer of graphene. The rearrangement of bonds and beam-induced ejection of carbon atoms are recorded as the hole grows. We investigated the mechanism of edge reconstruction and demonstrated the stability of the "zigzag" edge configuration. This study of an ideal low-dimensional interface, a hole in graphene, exhibits the complex behavior of atoms at a boundary.