Free-standing graphene at atomic resolution
Free-standing graphene at atomic resolution
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DOI：
10.1038/nnano.2008.280
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发表时间：
2008-11-01
影响因子：
38.3
通讯作者：
Geim, A. K.
中科院分区：
文献类型：
--
作者：
Gass, Mhairi H.;Bangert, Ursel;Geim, A. K.
石墨烯是一种由碳原子的单原子平面组成的二维晶体，其非凡的特性（包括模仿超相对论基本粒子的电荷载流子）推动了对石墨烯的研究兴趣。此外，石墨烯甚至在室温下也表现出亚微米级的弹道电子传输，这使得石墨烯基场效应晶体管的演示和室温量子霍尔效应的观察成为可能。在这里，我们证实了独立的，单层石墨烯的存在与直接可解释的原子分辨率成像结合的空间分辨研究的pi -> pi* 过渡和pi + sigma等离子体激元。我们还提出了原子尺度的观察形态的独立的石墨烯和探索的作用，影响稳定性的片材的微观结构的特点。我们还遵循点缺陷的演变和相互作用，并提出了一种机制，它们形成环缺陷。
Research interest in graphene, a two-dimensional crystal consisting of a single atomic plane of carbon atoms, has been driven by its extraordinary properties, including charge carriers that mimic ultra-relativistic elementary particles. Moreover, graphene exhibits ballistic electron transport on the submicrometre scale, even at room temperature, which has allowed the demonstration of graphene-based field-effect transistors and the observation of a room-temperature quantum Hall effect. Here we confirm the presence of free-standing, single-layer graphene with directly interpretable atomic-resolution imaging combined with the spatially resolved study of both the pi -> pi* transition and the pi + sigma plasmon. We also present atomic-scale observations of the morphology of free-standing graphene and explore the role of microstructural peculiarities that affect the stability of the sheets. We also follow the evolution and interaction of point defects and suggest a mechanism by which they form ring defects.