Journal
SCIENCE
Volume 323, Issue 5922, Pages 1701-1705Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.1166862
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Funding
- NSF [CTS-05-06830]
- Consejo Nacional de Ciencia y Tecnologia (CONACYT) Mexico [56787, 45772, 41464, 2004-01-013]
- UT-Battelle
- Division of Materials Science and Engineering, U.S. Department of Energy
- Division of Scientific User Facilities, U.S. Department of Energy
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Graphene nanoribbons can exhibit either quasi-metallic or semiconducting behavior, depending on the atomic structure of their edges. Thus, it is important to control the morphology and crystallinity of these edges for practical purposes. We demonstrated an efficient edge-reconstruction process, at the atomic scale, for graphitic nanoribbons by Joule heating. During Joule heating and electron beam irradiation, carbon atoms are vaporized, and subsequently sharp edges and step-edge arrays are stabilized, mostly with either zigzag- or armchair-edge configurations. Model calculations show that the dominant annealing mechanisms involve point defect annealing and edge reconstruction.
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