Pulling and Stretching a Molecular Wire to Tune its Conductance

Gaël Reecht, Hervé Bulou, Fabrice Scheurer, Virginie Speisser, Fabrice Mathevet, César González, Yannick J. Dappe, Guillaume Schull

    Research output: Contribution to journalArticlepeer-review

    15 Citations (Scopus)


    A scanning tunnelling microscope is used to pull a polythiophene wire from a Au(111) surface while measuring the current traversing the junction. Abrupt current increases measured during the lifting procedure are associated with the detachment of molecular subunits, in apparent contradiction with the expected exponential decrease of the conductance with wire length. Ab initio simulations reproduce the experimental data and demonstrate that this unexpected behavior is due to release of mechanical stress in the wire, paving the way to mechanically gated single-molecule electronic devices.

    Original languageEnglish
    Pages (from-to)2987-2992
    Number of pages6
    JournalJournal of Physical Chemistry Letters
    Issue number15
    Publication statusPublished - Aug 6 2015

    All Science Journal Classification (ASJC) codes

    • Materials Science(all)
    • Physical and Theoretical Chemistry

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