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.
- Electrical conductivity
- Single-molecule conductivity
- Electrical contacts
- Current voltage characteristics
- Chemical bonds
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. (2001). Reproducible measurement of single-molecule conductivity. Science, 294(5542), 571-574. https://doi.org/10.1126/science.1064354