Changes in the electronic properties of a molecule when it is wired into a circuit

X. D. Cui, A. Primak, X. Zarate, J. Tomfohr, O. F. Sankey, Ana L Moore, Thomas A Moore, John Devens Gust, L. A. Nagahara, S. M. Lindsay

Research output: Contribution to journalArticle

230 Citations (Scopus)

Abstract

Molecular electronic devices require at least two electrical contacts to one (or more) molecule(s). Single molecules are reliably probed by bonding one end to a gold substrate and the other end to a gold nanocrystal. The circuit is completed with a gold-coated atomic force microscope probe. Measurements of the decay of electronic current with the length of n-alkanedithiol molecules in these single-molecule nanojunctions are reported as a function of the applied bias. The value of the decay constant near zero bias was obtained from measurements in the ohmic region of the current-voltage curves. The electron tunneling decay rate is significantly smaller (βN = 0.57 ± 0.03) than observed for molecules bonded at just one end (βN ≈ 1), and it falls to even smaller values as the applied bias is increased. Both these effects are quantitatively accounted for by a large shift in molecular levels caused by the attachment of wires at each end.

Original languageEnglish
Pages (from-to)8609-8614
Number of pages6
JournalJournal of Physical Chemistry B
Volume106
Issue number34
DOIs
Publication statusPublished - Aug 29 2002

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Electronic properties
Molecules
Networks (circuits)
Gold
electronics
molecules
gold
Molecular electronics
Electron tunneling
molecular electronics
decay
electron tunneling
Nanocrystals
decay rates
attachment
electric contacts
nanocrystals
Microscopes
microscopes
wire

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry

Cite this

Cui, X. D., Primak, A., Zarate, X., Tomfohr, J., Sankey, O. F., Moore, A. L., ... Lindsay, S. M. (2002). Changes in the electronic properties of a molecule when it is wired into a circuit. Journal of Physical Chemistry B, 106(34), 8609-8614. https://doi.org/10.1021/jp0206065

Changes in the electronic properties of a molecule when it is wired into a circuit. / Cui, X. D.; Primak, A.; Zarate, X.; Tomfohr, J.; Sankey, O. F.; Moore, Ana L; Moore, Thomas A; Gust, John Devens; Nagahara, L. A.; Lindsay, S. M.

In: Journal of Physical Chemistry B, Vol. 106, No. 34, 29.08.2002, p. 8609-8614.

Research output: Contribution to journalArticle

Cui, XD, Primak, A, Zarate, X, Tomfohr, J, Sankey, OF, Moore, AL, Moore, TA, Gust, JD, Nagahara, LA & Lindsay, SM 2002, 'Changes in the electronic properties of a molecule when it is wired into a circuit', Journal of Physical Chemistry B, vol. 106, no. 34, pp. 8609-8614. https://doi.org/10.1021/jp0206065
Cui, X. D. ; Primak, A. ; Zarate, X. ; Tomfohr, J. ; Sankey, O. F. ; Moore, Ana L ; Moore, Thomas A ; Gust, John Devens ; Nagahara, L. A. ; Lindsay, S. M. / Changes in the electronic properties of a molecule when it is wired into a circuit. In: Journal of Physical Chemistry B. 2002 ; Vol. 106, No. 34. pp. 8609-8614.
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