期刊
NATURE NANOTECHNOLOGY
卷 3, 期 11, 页码 676-681出版社
NATURE PUBLISHING GROUP
DOI: 10.1038/nnano.2008.280
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资金
- Engineering and Physical Sciences Research Council (EPSRC) for SuperSTEM [EP/D040396/1]
- EPSRC [EP/D040396/1, EP/D040205/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/D040205/1, EP/D040396/1] Funding Source: researchfish
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.
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