期刊
NANO LETTERS
卷 12, 期 4, 页码 1928-1933出版社
AMER CHEMICAL SOC
DOI: 10.1021/nl204392s
关键词
Graphene; nanoribbon; chemical vapor deposition; edge states; scanning tunneling microscopy/spectroscopy
类别
资金
- Office of Basic Energy Sciences, U.S. Department of Energy
- National Science Foundation NSF [DMR 0845358]
- CNPq
- CAPES [process 0327-10-7]
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [0845358] Funding Source: National Science Foundation
We used scanning tunneling microscopy and spectroscopy (STM/S) techniques to analyze the relationships between the edge shapes and the electronic structures in as-grown chemical vapor deposition (CVD) graphene nanoribbons (GNRs). A rich variety of single-layered graphene nanoribbons exhibiting a width of several to 100 nm and up to 1 mu m long were studied. High-resolution STM images highlight highly crystalline nanoribbon structures with well-defined and clean edges. Theoretical calculations indicate clear spin-split edge states induced by electron electron Coulomb repulsion. The edge defects can significantly modify these edge states, and different edge structures for both sides of a single ribbon produce asymmetric electronic edge states, which reflect the more realistic features of CVD grown GNRs. Three structural models are proposed and analyzed to explain the observations. By comparing the models with an atomic resolution image at the edge, a pristine (2,1) structure was ruled out in favor of a reconstructed edge structure composed of 5-7 member rings, showing a better match with experimental results, and thereby suggesting the possibility of a defective morphology at the edge of CVD grown nanoribbons.
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