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Issue 36, 2015
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A scanning tunneling microscope break junction method with continuous bias modulation

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Abstract

Single molecule conductance measurements on 1,8-octanedithiol were performed using the scanning tunneling microscope break junction method with an externally controlled modulation of the bias voltage. Application of an AC voltage is shown to improve the signal to noise ratio of low current (low conductance) measurements as compared to the DC bias method. The experimental results show that the current response of the molecule(s) trapped in the junction and the solvent media to the bias modulation can be qualitatively different. A model RC circuit which accommodates both the molecule and the solvent is proposed to analyze the data and extract a conductance for the molecule.

Graphical abstract: A scanning tunneling microscope break junction method with continuous bias modulation

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Publication details

The article was received on 10 Jul 2015, accepted on 11 Aug 2015 and first published on 19 Aug 2015


Article type: Paper
DOI: 10.1039/C5NR04649A
Author version available: Download Author version (PDF)
Citation: Nanoscale, 2015,7, 14965-14973
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    A scanning tunneling microscope break junction method with continuous bias modulation

    E. Beall, X. Yin, D. H. Waldeck and E. Wierzbinski, Nanoscale, 2015, 7, 14965
    DOI: 10.1039/C5NR04649A

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