Transport mechanisms in metallic and semiconducting single-wall carbon nanotube networks

Kazuhiro Yanagi*, Hiroki Udoguchi, Satoshi Sagitani, Yugo Oshima, Taishi Takenobu, Hiromichi Kataura, Takao Ishida, Kazuyuki Matsuda, Yutaka Maniwa

*Corresponding author for this work

    Research output: Contribution to journalArticlepeer-review

    167 Citations (Scopus)


    A fundamental understanding of the conduction mechanisms in single-wall carbon nanotube (SWCNT) networks is crucial for their use in thin-film transistors and conducting films. However, the uncontrollable mixture state of metallic and semiconducting SWCNTs has always been an obstacle in this regard. In the present study, we revealed that the conduction mechanisms in nanotube networks formed by high-purity metallic and semiconducting SWCNTs are completely different. Quantum transport was observed in macroscopic networks of pure metallic SWCNTs. However, for semiconducting SWCNT networks, Coulomb-gap-type conduction was observed, due to Coulomb interactions between localized electrons. Crossovers among a weakly localized state and strongly localized states with and without Coulomb interactions were observed for transport electrons by varying the relative content of metallic and semiconducting SWCNTs. It was found that hopping barriers, which always exist in normal SWCNT networks and are serious obstacles to achieving high conductivity, were not present in pure metallic SWCNT networks.

    Original languageEnglish
    Pages (from-to)4027-4032
    Number of pages6
    JournalACS Nano
    Issue number7
    Publication statusPublished - 2010 Jul 27


    • carbon nanotube
    • metallic and semiconducting types
    • transport mechanisms
    • variable range hopping
    • weak localization

    ASJC Scopus subject areas

    • General Engineering
    • General Materials Science
    • General Physics and Astronomy


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