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Electrochemical single-molecule transistors with optimized gate coupling

Osorio, H.M., Catarelli, S., Cea, P., Gluyas, J.G.B., Hartl, F., Higgins, S.J., Leary, E., Low, P.J., Martín, S., Nichols, R.J., Tory, J., Ulstrup, J., Vezzoli, A., Milan, D.C. and Zeng, Q. (2015) Electrochemical single-molecule transistors with optimized gate coupling. Journal of the American Chemical Society, 137 (45). pp. 14319-14328. ISSN 0002-7863

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To link to this item DOI: 10.1021/jacs.5b08431

Abstract/Summary

Electrochemical gating at the single molecule level of viologen molecular bridges in ionic liquids is examined. Contrary to previous data recorded in aqueous electrolytes, a clear and sharp peak in the single molecule conductance versus electrochemical potential data is obtained in ionic liquids. These data are rationalized in terms of a two-step electrochemical model for charge transport across the redox bridge. In this model the gate coupling in the ionic liquid is found to be fully effective with a modeled gate coupling parameter, ξ, of unity. This compares to a much lower gate coupling parameter of 0.2 for the equivalent aqueous gating system. This study shows that ionic liquids are far more effective media for gating the conductance of single molecules than either solid-state three-terminal platforms created using nanolithography, or aqueous media.

Item Type:Article
Refereed:Yes
Divisions:Interdisciplinary centres and themes > Chemical Analysis Facility (CAF)
Faculty of Life Sciences > School of Chemistry, Food and Pharmacy > Department of Chemistry
ID Code:55438
Publisher:American Chemical Society

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