Synthesis of nitrogen-doped epitaxial graphene via plasma-assisted method: Role of the graphene-substrate interaction

SURFACE SCIENCE

卷:643

Article

Orlando, Fabrizio¹  Lacovig, Paolo²  Dalmiglio, Matteo²  Baraldi, Alessandro^1,2,3  Larciprete, Rosanna⁴  Lizzit, Silvano² 

[1] Univ Trieste, Dept Phys, I-34127 Trieste, Italy

[2] Elettra Sincrotrone Trieste SCpA, I-34149 Trieste, Italy

[3] IOM CNR, Lab TASC, I-34149 Trieste, Italy

[4] CNR Inst Complex Syst, I-00133 Rome, Italy

关键词: Graphene;    Functionalization;    Nitrogen doping;    XPS;    XPD;    Iridium;   

DOI  :  10.1016/j.susc.2015.06.017

来源: Elsevier

【 摘 要 】

Functionalization of graphene by substitution of carbon with nitrogen atoms is a promising way to tailor its electronic properties, but a good control over the heteroatomic configuration in the graphene network is most often a difficult task. In this paper, the synthesis of N-doped graphene by nitrogen plasma treatment of graphene/Ir(111) is presented. The formation of substitutional, pyrrolic and pyridinic nitrogen is analyzed by means of X-ray photoelectron spectroscopy (XPS) and X-ray photoelectron diffraction (XPD). The graphene-Ir interaction is suggested to control the variation in the relative concentration of the nitrogen species. Annealing of the sample also leads to modifications of the nitrogen species incorporated in the graphene layer. Furthermore, the connection of the substitutional nitrogen arrangement with its corresponding spectroscopic fingerprint is unequivocally confirmed by XPD measurements, which give also a direct insight on the local geometry of the nitrogen atoms incorporated in the carbon network. (C) 2015 Elsevier B.V. All rights reserved.

【 授权许可】

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