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Correlation of breaking forces, conductances and geometries of molecular junctions.

Type of publication Peer-reviewed
Publikationsform Review article (peer-reviewed)
Author Yoshida Koji, Pobelov Ilya V, Manrique David Zsolt, Pope Thomas, Mészáros Gábor, Gulcur Murat, Bryce Martin R, Lambert Colin J, Wandlowski Thomas,
Project Electron Transport at the Nanoscale - An Electrochemical Approach II
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Review article (peer-reviewed)

Journal Scientific reports
Volume (Issue) 5
Page(s) 9002 - 9002
Title of proceedings Scientific reports
DOI 10.1038/srep09002

Abstract

Electrical and mechanical properties of elongated gold-molecule-gold junctions formed by tolane-type molecules with different anchoring groups (pyridyl, thiol, amine, nitrile and dihydrobenzothiophene) were studied in current-sensing force spectroscopy experiments and density functional simulations. Correlations between forces, conductances and junction geometries demonstrate that aromatic tolanes bind between electrodes as single molecules or as weakly-conductive dimers held by mechanically-weak π - π stacking. In contrast with the other anchors that form only S-Au or N-Au bonds, the pyridyl ring also forms a highly-conductive cofacial link to the gold surface. Binding of multiple molecules creates junctions with higher conductances and mechanical strengths than the single-molecule ones.
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