X-ray absorption fine structure (XAFS) analyses of Ni species trapped in graphene sheet of carbon nanofibers

Mayuko Ushiro, Kanae Uno, Takashi Fujikawa, Yoshinori Sato, Kazuyuki Tohji, Fumio Watari, Wang Jae Chun, Yuichiro Koike, Kiyotaka Asakura

Research output: Contribution to journalArticlepeer-review

41 Citations (Scopus)

Abstract

Metal impurities in the carbon nanotubes and carbon nanofibers play an important role in understanding their physical and chemical properties. We apply the Ni K -edge x-ray absorption fine structure analyses to the local electronic and geometric structures around embedded Ni impurities used as catalysts in a carbon nanofiber in combination with multiple scattering analyses. We find almost Ni catalysts as metal particles are removed by the purification treatment. Even after the purification, residual 100 ppm Ni species are still absorbed; most of them are in monomer structure with Ni-C bond length 1.83 Å, and each of them is substituted for a carbon atom in a graphene sheet.

Original languageEnglish
Article number144103
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume73
Issue number14
DOIs
Publication statusPublished - 2006 Apr 19

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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