Abstract

Providing a mechanically stable and electronically efficient coupling between a molecule and an electrode is critical to the study of charge transfer and conductance of the molecule. A common method is to link the molecule to Au electrodes via a linker (e.g., thiol terminal of the molecule). Here we study the mechanical stability and electronic coupling of a S-Au bond in single-molecule junctions over a broad range of electrode potentials. Our results show that the mechanical and electromechanical properties of molecule-electrode contact undergo a systematic change with the potential involving Au oxidation at positive potentials and S protonation at negative potentials. The study establishes the potential range for a stable S-Au bond and determines the potential dependence of the mechanical and electromechanical properties of the molecule-electrode contact, which is crucial to the interpretation of potential-dependent charge transfer in electrochemistry and electrochemical gating of charge transport in molecular electronics.

Original languageEnglish (US)
JournalJournal of the American Chemical Society
DOIs
StateAccepted/In press - Jan 1 2018

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Mechanical stability
Electrodes
Molecules
Charge transfer
Electrochemistry
Sulfhydryl Compounds
Molecular electronics
Protonation
Oxidation

ASJC Scopus subject areas

  • Catalysis
  • Chemistry(all)
  • Biochemistry
  • Colloid and Surface Chemistry

Cite this

Potential Dependence of Mechanical Stability and Electronic Coupling of Single S-Au Bonds. / Wang, Hui; Wang, Zixiao; Wang, Yan; Hihath, Joshua; Chen, Hong Yuan; Li, Yueqi; Tao, Nongjian.

In: Journal of the American Chemical Society, 01.01.2018.

Research output: Contribution to journalArticle

Wang, Hui ; Wang, Zixiao ; Wang, Yan ; Hihath, Joshua ; Chen, Hong Yuan ; Li, Yueqi ; Tao, Nongjian. / Potential Dependence of Mechanical Stability and Electronic Coupling of Single S-Au Bonds. In: Journal of the American Chemical Society. 2018.
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AU - Wang, Zixiao

AU - Wang, Yan

AU - Hihath, Joshua

AU - Chen, Hong Yuan

AU - Li, Yueqi

AU - Tao, Nongjian

PY - 2018/1/1

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