Workfunction of purified and oxidised carbon nanotubes

H. Ago, Th Kugler, F. Cacialli, K. Petritsch, R. H. Friend, W. R. Salaneck, Y. Ono, T. Yamabe, K. Tanaka

研究成果: Contribution to journalConference article査読

46 被引用数 (Scopus)


We report for the first time the ultraviolet photoelectron spectroscopy (UPS) of purified multi-wall carbon nanotubes. Purification was carried out by successive sonication, centrifuge, sedimentation, and filtration processes of nanotubes-water solution dispersed by the non-ionic surfactant. Purified nanotubes showed the workfunction of 4.3 eV, very close to that of graphite (4.4 eV). It was found that purified nanotubes possess a finite density of states (DOS) at Fermi energy (EF), suggesting the existence of metallic nanotubes as predicted theoretically. The oxygen-plasma treatment which opens the end-cap and generates defects in the outer layers increased the workfunction dramatically up to 4.8 eV and removed the DOS at EF, indicating a new way to modify the electronic properties of nanotubes.

ジャーナルSynthetic Metals
出版ステータス出版済み - 6 24 1999
イベントProceedings of the 1998 International Conference on Science and Technology of Synthetic Metals (ICSM-98) - Montpellier
継続期間: 7 12 19987 18 1998

All Science Journal Classification (ASJC) codes

  • 電子材料、光学材料、および磁性材料
  • 凝縮系物理学
  • 材料力学
  • 機械工学
  • 金属および合金
  • 材料化学


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