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

Journal Article · Sat Apr 01 00:00:00 EST 2006 · Physical Review. B, Condensed Matter and Materials Physics

DOI:https://doi.org/10.1103/PHYSREVB.73.1· OSTI ID:20788050

Ushiro, Mayuko; Uno, Kanae; Fujikawa, Takashi; Sato, Yoshinori; Tohji, Kazuyuki; Watari, Fumio; Chun, W -J; Koike, Yuichiro; Asakura, Kiyotaka ^[1]

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1. Graduate School for Science, Chiba University, Yayoi-cho 1-33, Inage-ku, Chiba 263-8522 (Japan)

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 A, and each of them is substituted for a carbon atom in a graphene sheet.

• OSTI ID: 20788050
• Journal Information: Physical Review. B, Condensed Matter and Materials Physics, Vol. 73, Issue 14; Other Information: DOI: 10.1103/PhysRevB.73.144103; (c) 2006 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 1098-0121
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ABSORPTION
ATOMS
BOND LENGTHS
CATALYSTS
FINE STRUCTURE
GRAPHITE
IMPURITIES
MONOMERS
MULTIPLE SCATTERING
NANOTUBES
NICKEL
TRAPPING
X RADIATION
X-RAY SPECTRA