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An MCBJ case study: The influence of π-conjugation on the single-molecule conductance at a solid/liquid interface

Hong, W., Valkenier, H., Meszaros, G., Manrique, D. Z., Mishchenko, A., Putz, A., Garcia, P. M., Lambert, C. J., Hummelen, J. C. & Wandlowski, T., 18-Oct-2011, In : Beilstein Journal of Nanotechnology. 2, 1, p. 699-713 15 p.

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DOI

  • Wenjing Hong
  • Hennie Valkenier
  • Gabor Meszaros
  • David Zsolt Manrique
  • Artem Mishchenko
  • Alexander Putz
  • Pavel Moreno Garcia
  • Colin J. Lambert
  • Jan C. Hummelen
  • Thomas Wandlowski
π-Conjugation plays an important role in charge transport through single molecular junctions. We describe in this paper the construction of a mechanically controlled break-junction setup (MCBJ) equipped with a highly sensitive log I–V converter in order to measure ultralow conductances of molecular rods trapped between two gold leads. The current resolution of the setup reaches down to 10 fA. We report single-molecule conductance measurements of an anthracene-based linearly conjugated molecule (AC), of an anthraquinone-based cross-conjugated molecule (AQ), and of a dihydroanthracene-based molecule (AH) with a broken conjugation. The quantitative analysis of complementary current–distance and current–voltage measurements revealed details of the influence of π-conjugation on the single-molecule conductance.
Original languageEnglish
Pages (from-to)699-713
Number of pages15
JournalBeilstein Journal of Nanotechnology
Volume2
Issue number1
Publication statusPublished - 18-Oct-2011

    Keywords

  • anthraquinone, pi-conjugation, mechanically controlled break junction, single-molecule conductance, SELF-ASSEMBLED MONOLAYERS, TUNNELING JUNCTIONS, ORGANIC-MOLECULES, CHARGE-TRANSPORT, ANCHORING GROUPS, ELECTRONICS, DEPENDENCE, RESISTANCE, METAL, CONDUCTIVITY

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