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Issue 108, 2016
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Time-dependent evolution of the nitrogen configurations in N-doped graphene films

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Abstract

Large-area time-controlled N-doped graphene films were grown on a Cu foil using an ammonia-assisted atmospheric pressure chemical vapour deposition (APCVD) technique. The films were characterized using optical microscopy, Raman spectroscopy and X-ray photoelectron spectroscopy (XPS). Raman spectroscopy was used to verify the doping level and lattice distortion in the graphene films, while the degree of N-doping (N/C at%) and nitrogen configuration were studied by XPS. The results showed that both total nitrogen content and configurations were strongly dependent on the growth time. Notably, at short growth time (2 min) pyridinic-rich films with high oxygen content (∼47.02%) were produced, and the total N-content reached a maximum of 4.68%. Interestingly longer growth times (20 min) also resulted in pyridinic-rich films, however both the nitrogen and oxygen content were at lower values of 2.84% and ∼26.07%, respectively. With increasing growth time, Raman spectra showed a decreasing doping level as seen by the decreasing ID/IG ratio values (1.2 to 0.9). Additionally, Raman peaks exhibited a systematic blue shift due to the compressive strain on the C–C bonds during the incorporation of N atoms into the graphene lattice. The study presents an in-depth understanding of how exposure time of N-dopants influences the bonding states of nitrogen atoms to carbon atoms, thereby dictating the resulting type of N-configurations as well as the overall nitrogen content.

Graphical abstract: Time-dependent evolution of the nitrogen configurations in N-doped graphene films

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Publication details

The article was received on 28 Sep 2016, accepted on 27 Oct 2016 and first published on 27 Oct 2016


Article type: Paper
DOI: 10.1039/C6RA24094A
RSC Adv., 2016,6, 106914-106920
  • Open access: Creative Commons BY license
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    Time-dependent evolution of the nitrogen configurations in N-doped graphene films

    B. J. Matsoso, K. Ranganathan, B. K. Mutuma, T. Lerotholi, G. Jones and N. J. Coville, RSC Adv., 2016, 6, 106914
    DOI: 10.1039/C6RA24094A

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