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

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 cataly...

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Veröffentlicht in:Physical review. B, Condensed matter and materials physics Condensed matter and materials physics, 2006-04, Vol.73 (14)
Hauptverfasser: Ushiro, Mayuko, Uno, Kanae, Fujikawa, Takashi, Sato, Yoshinori, Tohji, Kazuyuki, Watari, Fumio, Chun, W.-J., Koike, Yuichiro, Asakura, Kiyotaka, Graduate School of Environmental Studies, Tohoku University, Aoba, Sendai 980-8579, Graduate School of Dental Medicine, Department of Biomedical, Dental Materials and Engineering, Hokkaido University, Kita 13 Nishi 7, Sapporo, 060-8586, Catalysis Research Center, Hokkaido University and Core Research for Evolution Science and Technology, Japan Science and Technology Corporation, Kita 21 Nishi 11, Sapporo, 001-0021, Catalysis Research Center, Department of Quantum Science and Engineering, Hokkaido University, Kita 21 Nishi 11, Sapporo, 001-0021
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Sprache:eng
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Zusammenfassung: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.
ISSN:1098-0121
1550-235X
DOI:10.1103/PHYSREVB.73.1