Molecular-mediated single-electron devices operating at room temperature

Touichiro Goto, Katsuhiko Degawa, Hiroshi Inokawa, Kazuaki Furukawa, Hiroshi Nakashima, Koji Sumitomo, Takafumi Aoki, Keiichi Torimitsu

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)


We report the electrical characteristics of gold nanogap devices modified by conjugated molecules with thiol endgroups. Gold nanogap electrodes with a nominal gap distance of between 1-2nm were fabricated by double oblique deposition from opposite directions. The electrodes were then immersed in 4,4′-p-terphenyldithiol (TPDT) solutions to enhance conductance. Using the substrate as a gate electrode, we observed a large Coulomb diamond at room temperature with a charging energy as large as 0.25 eV. The characteristics of the device can be explained on the basis of a multi-metallic-island system. It is considered that ultra small gold islands are formed during the metal deposition and that the molecules bridging metallic islands and electrodes work as tunnel junctions.

Original languageEnglish
Pages (from-to)4285-4289
Number of pages5
JournalJapanese Journal of Applied Physics
Issue number5 A
Publication statusPublished - 2006 May 9


  • Coulomb blockade
  • Molecular devices
  • Nanogap electrodes
  • Self-assembled monolayers (SAMs)
  • Single-electron transistors (SETs)


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