A molecular switch based on potential-induced changes of oxidation state

Fan Chen, Jin He, Colin Nuckolls, Tucker Roberts, Jennifer E. Klare, Stuart Lindsay

Research output: Contribution to journalArticlepeer-review

252 Scopus citations


We have measured the conductance of a hepta-aniline oligomer attached to gold electrodes held under potential control in electrolyte. It increases fifteen-fold (to 5.3±0.4 nS) on oxidation from the leucoemeraldine form to the emeraldine salt. The single-molecule current-voltage characteristic, linear in toluene, displays negative differential resistance in an acidic electrolyte. The negative differential resistance is accounted for by modification of the local surface potential by the applied bias. These results connect electrochemical data directly to molecular electronic behavior in a two-terminal device.

Original languageEnglish (US)
Pages (from-to)503-506
Number of pages4
JournalNano Letters
Issue number3
StatePublished - Mar 1 2005

ASJC Scopus subject areas

  • Bioengineering
  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanical Engineering


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