期刊
ACS NANO
卷 7, 期 1, 页码 198-202出版社
AMER CHEMICAL SOC
DOI: 10.1021/nn303730v
关键词
graphene nanoribbon; synthesis; scanning tunneling microscopy; first-principles calculations
类别
资金
- Office of Naval Research Multidisciplinary University Research Initiative (MURI) [N00014-09-1-1066]
- Office of Science, Office of Basic Energy Sciences of the U.S. Department of Energy [DE-AC02-05CH11231]
- National Science Foundation [DMR10-1006184]
- Swiss National Science Foundation [PP00P2_133552]
- Samsung
- MARCO MSD
The edges of graphene nanoribbons (GNRs) have attracted much interest due to their potentially strong influence on GNR electronic and magnetic properties. Here we report the ability to engineer the microscopic edge termination of high-quality GNRs via hydrogen plasma etching. Using a combination of high-resolution scanning tunneling microscopy and first-principles calculations, we have determined the exact atomic structure of plasma-etched GNR edges and established the chemical nature of terminating functional groups for zigzag, armchair, and chiral edge orientations. We find that the edges of hydrogen-plasma-etched GNRs are generally flat, free of structural reconstructions, and terminated by hydrogen atoms with no rehybridlzation of the outermost carbon edge atoms. Both zigzag and chiral edges show the presence of edge states.
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