Reproducible measurement of single-molecule conductivity |
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Authors: | Cui X D Primak A Zarate X Tomfohr J Sankey O F Moore A L Moore T A Gust D Harris G Lindsay S M |
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Affiliation: | Department of Physics and Astronomy, Arizona State University, Tempe, AZ 85287, USA. |
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Abstract: | 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. |
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