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Zhao, Liuyan; He, Rui; Rim, Kwang Taeg; Schiros, Theanne; Kim, Keun Soo; Zhou, Hui; Gutiérrez, Christopher; Chockalingam, S. P.; Arguello, Carlos J.; Pálová, Lucia; Nordlund, Dennis; Hybertsen, Mark S.; Reichman, David R.; Heinz, Tony F.; Kim, Philip; Pinczuk, Aron; Flynn, George W.; Pasupathy, Abhay N.
Science (American Association for the Advancement of Science), 08/2011, Letnik: 333, Številka: 6045Journal Article
In monolayer graphene, substitutional doping during growth can be used to alter its electronic properties. We used scanning tunneling microscopy, Raman spectroscopy, x-ray spectroscopy, and first principles calculations to characterize individual nitrogen dopants in monolayer graphene grown on a copper substrate. Individual nitrogen atoms were incorporated as graphitic dopants, and a fraction of the extra electron on each nitrogen atom was delocalized into the graphene lattice. The electronic structure of nitrogen-doped graphene was strongly modified only within a few lattice spacings of the site of the nitrogen dopant. These findings show that chemical doping is a promising route to achieving high-quality graphene films with a large carrier concentration.
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in: SICRIS
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