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

Research output: Contribution to journalConference articlepeer-review

49 Citations (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.

Original languageEnglish
Pages (from-to)2494-2495
Number of pages2
JournalSynthetic Metals
Issue number1-3
Publication statusPublished - Jun 24 1999
Externally publishedYes
EventProceedings of the 1998 International Conference on Science and Technology of Synthetic Metals (ICSM-98) - Montpellier
Duration: Jul 12 1998Jul 18 1998

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry


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