Making electrical contacts to molecular monolayers

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

Research output: Contribution to journalArticle

285 Citations (Scopus)

Abstract

Electrical contacts between a metal probe and molecular monolayers have been characterized using conducting atomic force microscopy in an inert environment and in a voltage range that yields reversible current-voltage data. The current through alkanethiol monolayers depends on the contact force in a way that is accounted for by the change of chain-to-chain tunnelling with film thickness. The electronic decay constant, βN, was obtained from measurements as a function of chain length at constant force and bias, yielding βN = 0.8 ± 0.2 per methylene over a ± 3 V range. Current-voltage curves are difficult to reconcile with this almost constant value. Very different results are obtained when a gold tip contacts a 1, 8-octanedithiol film. Notably, the current-voltage curves are often independent of contact force. Thus the contact may play a critical role both in the nature of charge transport and the shape of the current-voltage curve.

Original languageEnglish
Pages (from-to)5-14
Number of pages10
JournalNanotechnology
Volume13
Issue number1
DOIs
Publication statusPublished - Feb 2002

Fingerprint

electric contacts
Monolayers
Electric potential
electric potential
curves
Molecular Probes
Chain length
methylene
Gold
Film thickness
Charge transfer
Atomic force microscopy
film thickness
Metals
atomic force microscopy
gold
conduction
probes
decay
electronics

ASJC Scopus subject areas

  • Engineering (miscellaneous)
  • Materials Science(all)
  • Physics and Astronomy (miscellaneous)

Cite this

Cui, X. D., Zarate, X., Tomfohr, J., Sankey, O. F., Primak, A., Moore, A. L., ... Lindsay, S. M. (2002). Making electrical contacts to molecular monolayers. Nanotechnology, 13(1), 5-14. https://doi.org/10.1088/0957-4484/13/1/302

Making electrical contacts to molecular monolayers. / Cui, X. D.; Zarate, X.; Tomfohr, J.; Sankey, O. F.; Primak, A.; Moore, Ana L; Moore, Thomas A; Gust, John Devens; Harris, G.; Lindsay, S. M.

In: Nanotechnology, Vol. 13, No. 1, 02.2002, p. 5-14.

Research output: Contribution to journalArticle

Cui, XD, Zarate, X, Tomfohr, J, Sankey, OF, Primak, A, Moore, AL, Moore, TA, Gust, JD, Harris, G & Lindsay, SM 2002, 'Making electrical contacts to molecular monolayers', Nanotechnology, vol. 13, no. 1, pp. 5-14. https://doi.org/10.1088/0957-4484/13/1/302
Cui XD, Zarate X, Tomfohr J, Sankey OF, Primak A, Moore AL et al. Making electrical contacts to molecular monolayers. Nanotechnology. 2002 Feb;13(1):5-14. https://doi.org/10.1088/0957-4484/13/1/302
Cui, X. D. ; Zarate, X. ; Tomfohr, J. ; Sankey, O. F. ; Primak, A. ; Moore, Ana L ; Moore, Thomas A ; Gust, John Devens ; Harris, G. ; Lindsay, S. M. / Making electrical contacts to molecular monolayers. In: Nanotechnology. 2002 ; Vol. 13, No. 1. pp. 5-14.
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