期刊
NANO LETTERS
卷 14, 期 11, 页码 6155-6159出版社
AMER CHEMICAL SOC
DOI: 10.1021/nl5023095
关键词
Graphene; EELS; STEM; Edge states; TEM; Carbon
类别
资金
- Royal Society
- Sasakawa Fund
- JST Research Acceleration programme
- JSPS KAKENHI [23681026, 26390004]
- Grants-in-Aid for Scientific Research [26390004] Funding Source: KAKEN
The local atomic bonding of carbon atoms around the edge of graphene is examined by aberration-corrected scanning transmission electron microscopy (STEM) combined with electron energy loss spectroscopy (EELS). High-resolution 2D maps of the EELS combined with atomic resolution annular dark field STEM images enables correlations between the carbon K-edge EELS and the atomic structure. We show that energy states of graphene edges vary across individual atoms along the edge according to their specific C-C bonding, as well as perpendicular to the edge. Unique spectroscopic peaks from the EELS are assigned to specific C atoms, which enables unambiguous spectroscopic fingerprint identification for the atomic structure of graphene edges with unprecedented detail.
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