@article{2a16062f0d5444a98e7c7b587c9fb6af,
title = "Nitrogen-doped graphene: Beyond single substitution and enhanced molecular sensing",
abstract = "Graphene is a two-dimensional network in which sp 2 -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 (N 2 AA). Scanning tunneling microscopy and spectroscopy (STM and STS) of NG revealed the presence of localized states in the conduction band induced by N 2 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.",
author = "Ruitao Lv and Qing Li and Botello-M{\'e}ndez, \{Andr{\'e}s R.\} and Takuya Hayashi and Bei Wang and Ayse Berkdemir and Qingzhen Hao and El{\'e}as, \{Ana Laura\} and Rodolfo Cruz-Silva and Guti{\'e}rrez, \{Humberto R.\} and Kim, \{Yoong Ahm\} and Hiroyuki Muramatsu and Jun Zhu and Morinobu Endo and Humberto Terrones and Charlier, \{Jean Christophe\} and Minghu Pan and Mauricio Terrones",
note = "Funding Information: M.T. and J.Z. thank the Penn State Center for Nanoscale Science for a seed grant entitled {\textquoteleft}Defect Engineering of 2-D Sheets of Layered Materials{\textquoteright}. M.T. also acknowledges the support from the Research Center for Exotic Nanocarbons, Japan regional Innovation Strategy Program by the Excellence, JST. A.R.B.M. acknowledges support from the M. de Merre prize of Louvain. The STM research was conducted at the Center for Nanophase Materials Sciences (CNMS), which is sponsored at Oak Ridge National Laboratory by the Scientific User Facilities Division, Office of Basic Energy Sciences, U. S. Department of Energy. This research is directly connected to the F.R.S.-FNRS of Belgium, the Belgian Program on Interuniversity Attraction Poles and to the ARC on « Graphene StressTronics » sponsored by the Communaut{\'e} Fran{\c c}aise de Belgique. M.T. and R.T.L. thank T. Fujimori and F. L{\'o}pez-Ur{\'i}as for fruitful discussions about GERS experiments and growth mechanism, respectively. We also thank S. Feng and S. A. Rosas for their contributions in carrying out some of the control experiments. Computational resources were provided by the CISM of the Universit{\'e} catholique de Louvain (GREEN and LEMAITRE computers). H.T. acknowledges funding from Programa Professor Visitante do Exterior - PVE as {"}Bolsista CAPES/BRASIL{"}. The authors acknowledge the Materials Research Institute at Penn State for the use of characterization facilities.",
year = "2012",
doi = "10.1038/srep00586",
language = "English (US)",
volume = "2",
journal = "Scientific reports",
issn = "2045-2322",
publisher = "Nature Research",
}