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


Creative Commons License

LV R., LI Q., BOTELLO-MENDEZ A. R. , HAYASHI T., WANG B., Berkdemir A. , et al.

SCIENTIFIC REPORTS, cilt.2, 2012 (SCI İndekslerine Giren Dergi) identifier identifier identifier

  • Cilt numarası: 2
  • Basım Tarihi: 2012
  • Doi Numarası: 10.1038/srep00586
  • Dergi Adı: SCIENTIFIC REPORTS

Özet

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.