Bias-induced local heating effects on multi-walled carbon nanotube-Au contacts

Makusu Tsutsui, Yu Ki Taninouchi, Shu Kurokawa, Akira Sakai

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6 Citations (Scopus)


Exploiting a mechanically controllable break junction (MCBJ) technique, we prepared multi-walled carbon nanotubes (MWNTs) bridging over Au electrodes and investigated their conductance-bias voltage (G-V) characteristics in a high-bias regime. Above a threshold bias voltage, we observed a rapid and irreversible increase in conductance, which appears only with increasing bias. This phenomenon can be attributed to irreversible contact annealing due to contact heating. Observation of two-level fluctuations in the MWNT conductance at high biases also implies defect annealing inside Au electrodes. The conductance increment is occasionally observed at one bias polarity but not at a reverse polarity. The asymmetry in the heating effect with respect to the bias polarity suggests that the electron transport in MWNTs is ballistic, and the energy dissipation takes place only at the anode contact.

Original languageEnglish
Pages (from-to)341-345
Number of pages5
JournalJapanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers
Issue number1 A
Publication statusPublished - Jan 10 2006
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Engineering(all)
  • Physics and Astronomy(all)


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