Electrochemical origin of voltage-controlled molecular conductance switching

Jin He, Qiang Fu, Stuart Lindsay, Jacob W. Ciszek, James M. Tour

Research output: Contribution to journalArticlepeer-review

91 Scopus citations

Abstract

We have studied electron transport in bipyridyl-dinitro oligophenylene-ethynelene dithiol (BPDN) molecules both in an inert environment and in aqueous electrolyte under potential control, using scanning tunneling microscopy. Current-voltage (IV) data obtained in an inert environment were similar to previously reported results showing conductance switching near 1.6 V. Similar measurements taken in electrolyte under potential control showed a linear dependence of the bias for switching on the electrochemical potential. Extrapolation of the potentials to zero switching bias coincided with the potentials of redox processes on these molecules. Thus switching is caused by a change in the oxidation state of the molecules.

Original languageEnglish (US)
Pages (from-to)14828-14835
Number of pages8
JournalJournal of the American Chemical Society
Volume128
Issue number46
DOIs
StatePublished - Nov 22 2006

ASJC Scopus subject areas

  • Catalysis
  • Chemistry(all)
  • Biochemistry
  • Colloid and Surface Chemistry

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