The influence of γ-irradiation on nitrogen configuration in nitrogen-doped single-walled carbon nanotubes

Theerapol Thurakitseree (Corresponding author), Christian Kramberger, Narong Chanlek, Ratchadaporn Supruangnet, Anurat Wisitsorraat, Hideki Nakajima, Shigeo Maruyama

Publications: Contribution to journalArticlePeer Reviewed

Abstract

Electronic properties of nitrogen-doped single-walled carbon nanotubes (N-doped SWCNTs) depend on carbon and nitrogen configuration. Depending on the intrinsic nitrogen structure, it can be either intrinsic p- or n- doping. Here, we have investigated the influence of soft gamma (γ)-irradiation on the nitrogen configuration in vertically aligned N-doped SWCNT arrays. As the irradiation dose increased, pyridinic and graphitic nitrogens become more predominant. In general, the presence of holes refer to p-doping. However, XPS spectra show n-doping features, whereas the slight downshift in the G line position in Raman spectra is from compensating the ambient p-doping. The local transition of π* nitrogen was also revealed by X-ray absorption spectroscopy.
Original languageEnglish
Article number107569
Number of pages5
JournalDiamond and Related Materials
Volume101
DOIs
Publication statusPublished - Jan 2020

Austrian Fields of Science 2012

  • 103018 Materials physics

Keywords

  • Single-walled carbon nanotube
  • Nitrogen-doped SWCNTs
  • Nitrogen configuration
  • Reforming
  • Gamma irradiation
  • GRAPHENE
  • GROWTH
  • RAMAN
  • ELECTRON

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