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Thermal stability study of nitrogen functionalities in a graphene network.

Ajay Kumar1, Abhijit Ganguly, Pagona Papakonstantinou

  • 1Engineering Research Institute (ERI), School of Engineering, University of Ulster, Newtownabbey, UK. ajayepph@gmail.com

Journal of Physics. Condensed Matter : an Institute of Physics Journal
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PubMed
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Nitrogen doping of graphene nanoflakes using low energy ion bombardment creates pyridinic and graphitic configurations. This method offers controllable tuning of nitrogen doping for advanced device applications.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Surface Science

Background:

  • Vertically aligned graphene nanoflakes offer abundant edge sites for functionalization.
  • Nitrogen doping is crucial for tuning graphene's electronic properties.

Purpose of the Study:

  • To functionalize graphene nanoflakes with nitrogen using low-energy ion bombardment.
  • To investigate the thermal evolution of nitrogen configurations in graphene.

Main Methods:

  • Catalyst-free N(+) ion bombardment for nitrogen functionalization.
  • In situ high-resolution X-ray photoemission spectroscopy (HRXPS) for electronic structure analysis.
  • Temperature-dependent study from 20°C to 800°C.

Main Results:

  • Achieved nitrogen doping levels up to 9.6 at.% in graphene nanoflakes.
  • Identified pyridinic configurations as dominant at room temperature.
  • Observed a shift to dominant graphitic nitrogen configurations at 800°C.

Conclusions:

  • Low-energy ion bombardment is an effective method for nitrogen doping of graphene.
  • Understanding the thermal stability of nitrogen functionalities is key for device applications.
  • Controllable tuning of nitrogen doping in graphene is achievable.