Visualizing Individual Nitrogen Dopants in Monolayer Graphene

By Liuyan Zhao, R. He, K. Rim, T. Schiros, Keun Soo Kim, Hui Zhou, C. Gutiérrez, S. Chockalingam, C. Arguello, L. Pálová and 8 more. Science, 2011

819 citations recorded by the source corpus.

Nitrogen atoms that replace carbon atoms in the graphene lattice strongly modify the local electronic structure. 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.

Subfields: Electrical and Electronic Engineering, Materials Chemistry

View Paper: https://www.semanticscholar.org/paper/e6ed8dfc31f6cb32dc521349fd8230eb79f9c58f

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Citations in the corpus

• Evolution of Raman spectra in nitrogen doped graphene (2013, methodology): “Nitrogen doping was found to introduce n-doping in graphene and carbon nanotubes [10,14,37], and hence should cause a blueshift of G peak and redshift of 2D peak [37] (or no obvious 2D peak shift as presnted by Das et al.”
• Mechanisms of Two-Electron and Four-Electron Electrochemical Oxygen Reduction Reactions at Nitrogen-Doped Reduced Graphene Oxide (2019, background): “These include pure carbon in different forms (amorphous, glassy, graphite, graphene, fullerenes, nanotubes, nanoribbons) and carbon with different heteroatom substitutions.(2-7) These electrocatalysts yield a wide variety of electrochemical results, both in terms of ORR activity and selectivity.”