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Science. 2001 Oct 19;294(5542):571-4.

Reproducible measurement of single-molecule conductivity.

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  • 1Department of Physics and Astronomy, Arizona State University, Tempe, AZ 85287, USA.

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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PMID:
11641492
[PubMed - indexed for MEDLINE]
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