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“School of Nano-Sciences”

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Paper   IPM / Nano-Sciences / 13641
School of Nano Science
  Title:   The Chemistry of Imperfections in N-Graphene
  Author(s): 
1 . Dmitry Usachov
2 . Alexander Fedorov
3 . Oleg Vilkov
4 . Boris Senkovskiy
5 . Vera Adamchuk
6 . Lada Yashina
7 . Andrey Volykhov
8 . Mani Farjam
9 . Nikolay Verbitskiy
10 . Alexander Gruneis
11 . Clemens Laubschat
12 . Denis Vyalikh
  Status:   Published
  Journal: Nano Let.
  No.:  9
  Vol.:  14
  Year:  2014
  Pages:   4982-4988
  Publisher(s):   American Chemical Society
  Supported by:  IPM
  Abstract:
Many propositions have been already put forth for the practical use of N-graphene in various devices, such as batteries, sensors, ultracapacitors, and next generation electronics. However, the chemistry of nitrogen imperfections in this material still remains an enigma. Here we demonstrate a method to handle N-impurities in graphene, which allows efficient conversion of pyridinic N to graphitic N and therefore precise tuning of the charge carrier concentration. By applying photoemission spectroscopy and density functional calculations, we show that the electron doping effect of graphitic N is strongly suppressed by pyridinic N. As the latter is converted into the graphitic configuration, the efficiency of doping rises up to half of electron charge per N atom.

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