Electron transport in single molecules measured by a distance-modulation assisted break junction method

J. L. Xia, I. Diez-Perez, Nongjian Tao

Research output: Contribution to journalArticle

51 Scopus citations


We describe a method to determine whether a measured current in a break junction is due to electron tunneling via space or conduction through a molecule bridged between two electrodes. By modulating the electrode separation, we monitor both the DC and the AC components of the current. The AC component indicates if a molecule is connected to the electrodes while the DC component is the Vransport current through the molecule. This method allows us to remove the tunneling background from conductance histograms and unambiguously measure the l-V characteristic of single molecules. Furthermore, it provides valuable information about the electromechanical properties of single molecules.

Original languageEnglish (US)
Pages (from-to)1960-1964
Number of pages5
JournalNano Letters
Issue number7
StatePublished - Jul 1 2008


ASJC Scopus subject areas

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

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