Correlation of breaking forces, conductances and geometries of molecular junctions

Koji Yoshida, Ilya V. Pobelov, David Zsolt Manrique, Thomas Pope, Gábor Mészáros, Murat Gulcur, Martin R. Bryce, Colin J. Lambert, Thomas Wandlowski

    Research output: Contribution to journalArticlepeer-review

    31 Citations (Scopus)

    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.

    Original languageEnglish
    Article number9002
    JournalScientific reports
    Volume5
    DOIs
    Publication statusPublished - 2015 Mar 11

    ASJC Scopus subject areas

    • General

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