Reproducible measurement of single-molecule conductivity

X. D. Cui, A. Primak, X. Zarate, J. Tomfohr, O. F. Sankey, Ana Moore, Thomas Moore, D. Gust, G. Harris, Stuart Lindsay

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A reliable method has been developed for making through-bond electrical contacts to molecules. Current-voltage curves are quantized as integer multiples of one fundamental curve, an observation used to identify single-molecule contacts. The resistance of a single octanedithiol molecule was 900 ± 50 megohms, based on measurements on more than 1000 single molecules. In contrast, nonbonded contacts to octanethiol monolayers were at least four orders of magnitude more resistive, less reproducible, and had a different voltage dependence, demonstrating that the measurement of intrinsic molecular properties requires chemically bonded contacts.

Original languageEnglish (US)
Pages (from-to)571-574
Number of pages4
Issue number5542
StatePublished - Oct 19 2001

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    Cui, X. D., Primak, A., Zarate, X., Tomfohr, J., Sankey, O. F., Moore, A., Moore, T., Gust, D., Harris, G., & Lindsay, S. (2001). Reproducible measurement of single-molecule conductivity. Science, 294(5542), 571-574.