Electrical Properties of Connected Multiwall Carbon Nanotubes

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  • Hamada Yoshihiro
    Department of Physics and Electronics, Osaka Prefecture University
  • Negishi Hideki
    Department of Physics and Electronics, Osaka Prefecture University
  • Akita Seiji
    Department of Physics and Electronics, Osaka Prefecture University
  • Nakayama Yoshikazu
    Department of Physics and Electronics, Osaka Prefecture University Handai Frontier Research Center, Graduate School of Engineering, Osaka University

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We have investigated the carrier transport properties of multiwall carbon nanotubes (MWNTs) by scanning probe microscopy. Kelvin force microscopy revealed that the potential profile was almost flat along the axis of an MWNT with a current flow of ∼10 μA. Furthermore, current-mode imaging with an applied voltage of 10 mV along an MWNT protruding from an electrode the current to be almost constant at ∼20 nA despite variations in the distance from the electrode to the probe. We also found small corrugations with a period of ∼25 nm on the current profile, which originate from the standing wave of the carrier in the MWNT protruding from the electrode. These results strongly suggest that the carrier transport in the MWNT is ballistic even at room temperature.

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