Measurement of Single-Molecule Resistance by Repeated Formation of Molecular Junctions

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Science  29 Aug 2003:
Vol. 301, Issue 5637, pp. 1221-1223
DOI: 10.1126/science.1087481

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The conductance of a single molecule connected to two gold electrodes was determined by repeatedly forming thousands of gold-molecule-gold junctions. Conductance histograms revealed well-defined peaks at integer multiples of a fundamental conductance value, which was used to identify the conductance of a single molecule. The resistances near zero bias were 10.5 ± 0.5, 51 ± 5, 630 ± 50, and 1.3 ± 0.1 megohms for hexanedithiol, octanedithiol, decanedithiol, and 4,4′ bipyridine, respectively. The tunneling decay constant (βN) for N-alkanedithiols was 1.0 ± 0.1 per carbon atom and was weakly dependent on the applied bias. The resistance and βN values are consistent with first-principles calculations.

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