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

Research output: Contribution to journalJournal article


  • Wenjing Hong
  • Hennie Valkenier
  • Gabor Meszaros
  • David Manrique
  • Artem Mishchenko
  • Alexander Putz
  • Pavel Moreno Garcia
  • Colin J. Lambert
  • Jan C. Hummelen
  • Thomas Wandlowski
Journal publication date18/10/2011
JournalBeilstein Journal of Nanotechnology
Number of pages15
Original languageEnglish


pi-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 p-conjugation on the single-molecule conductance.