Length dependence of charge transport in nanoscopic molecular junctions incorporating a series of rigid thiol-terminated norbornylogs

Jeremy M. Beebe, Vincent B. Engelkes, Jingquan Liu, J. Justin Gooding, Paul K. Eggers, Yongseok Jun, Xiaoyang Zhu, Michael N. Paddon-Row, C. Daniel Frisbie

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32 Citations (Scopus)

Abstract

Four tetrathiol-terminated norbornane homologues were synthesized and self-assembled monolayers (SAMs) of these molecules were formed on Au via adsorption from CH 2Cl 2. SAMs were characterized structurally via spectroscopic ellipsometry (SE), reflection-absorption infrared spectroscopy (RAIRS), Rutherford backscattering spectrometry (RBS), and X-ray photoelectron spectroscopy (XPS). Results of these analyses show that the rigid norbornylogs form monolayers that have a surface coverage slightly lower than that of alkanethiols, and that they exhibit a nonmonotonic dependence of film thickness on molecular length. Nanoscale molecular junctions incorporating these SAMs were formed and characterized electrically using conducting probe atomic force microscopy (CP-AFM). The resistances of these junctions scale exponentially with the contour length of the molecules, with β = 0.9 Å -1, consistent with a nonresonant tunneling mechanism. Further, the resistance of norbornyl SAMs correlates well with the resistance of alkanedithiol SAMs of similar length, suggesting that the norbornyl molecules form sulfur-metal bonds on both ends of the junction.

Original languageEnglish
Pages (from-to)5207-5215
Number of pages9
JournalJournal of Physical Chemistry B
Volume109
Issue number11
DOIs
Publication statusPublished - 2005 Mar 24

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films
  • Materials Chemistry

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    Beebe, J. M., Engelkes, V. B., Liu, J., Gooding, J. J., Eggers, P. K., Jun, Y., Zhu, X., Paddon-Row, M. N., & Frisbie, C. D. (2005). Length dependence of charge transport in nanoscopic molecular junctions incorporating a series of rigid thiol-terminated norbornylogs. Journal of Physical Chemistry B, 109(11), 5207-5215. https://doi.org/10.1021/jp044630p