Nitrogen-doped graphene: beyond single substitution and enhanced molecular sensing

Lv, Ruitao;Li, Qing;Botello Mendez, Andrés Rafael;Charlier, Jean-Christophe
(2012) Scientific Reports — Vol. 2, n° 586, p. 1-8 (2012)

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Graphene is a two-dimensional network in which sp2-hybridized carbon atoms are arranged in two different triangular sub-lattices (A and B). By incorporating nitrogen atoms into graphene, its physico-chemical properties could be significantly altered depending on the doping configuration within the sub-lattices. Here, we describe the synthesis of large-area, highly-crystalline monolayer N-doped graphene (NG) sheets via atmospheric-pressure chemical vapor deposition, yielding a unique N-doping site composed of two quasi-adjacent substitutional nitrogen atoms within the same graphene sub-lattice (N2 AA). Scanning tunneling microscopy and spectroscopy (STM and STS) ofNGrevealed the presence of localized states in the conduction band induced by N2 AA-doping, which was confirmed by ab initio calculations. Furthermore, we demonstrated for the first time that NG could be used to efficiently probe organic molecules via a highly improved graphene enhanced Raman scattering.
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Lv, R., Li, Q., Botello Mendez, A. R., & Charlier, J.-C. (2012). Nitrogen-doped graphene: beyond single substitution and enhanced molecular sensing. Scientific Reports, 2(586), 1-8. https://doi.org/10.1038/srep00586 (Original work published 2012)