Electrochemical gate-controlled conductance of single oligo(phenylene ethynylene)s

Xiaoyin Xiao, Larry A. Nagahara, Adam M. Rawlett, Nongjian Tao

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242 Scopus citations


We have studied electron transport properties of unsubstituted oligo(phenylene ethynylene) (OPE) (1) and nitro-substituted OPE (2) covalently bound to two gold electrodes. The conductance values of single 1 and 2 are ∼13 and ∼6 nS, respectively. In addition to a decrease in the conductance, the presence of the nitro moiety leads to asymmetric I-V characteristics and a negative differential resistance-like (NDR-like) behavior. We have altered the nitro-substituted OPE by electrochemically reducing the nitro group and by varying the pH of the electrolyte. The conductance decreases linearly with the electron-withdrawing capability (i.e., Hammett substituent values) of the corresponding reduced species. In contrast, the conductance of 1 is independent of the pH and the electrode potential.

Original languageEnglish (US)
Pages (from-to)9235-9240
Number of pages6
JournalJournal of the American Chemical Society
Issue number25
StatePublished - Jun 29 2005

ASJC Scopus subject areas

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


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