C-Au Covalently Bonded Molecular Junctions Using Nonprotected Alkynyl Anchoring Groups

Journal article (2016)

Authors

I.J. Olavarria Contreras QN/van der Zant Lab - AS
M.L. Perrin QN/van der Zant Lab - AS
Zhi Chen Karlsruhe Institut für Technologie
Svetlana Klyatskaya Karlsruhe Institut für Technologie
Mario Ruben University of Strasbourg, Karlsruhe Institut für Technologie
H.S.J. van der Zant QN/van der Zant Lab - AS
Research Group
QN/van der Zant Lab (AS) (TU Delft)
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Published Date

13-07-2016

Language

English

Reuse Rights

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Faculty

Applied Sciences

Department

QN/Quantum Nanoscience

Research Group

QN/van der Zant Lab

Abstract

We report on an approach to realize carbon-gold (C-Au) bonded molecular junctions without the need for an additive to deprotect the alkynyl carbon as endstanding anchor group. Using the mechanically controlled break junction (MCBJ) technique, we determine the most probable conductance value of a family of alkynyl terminated oligophenylenes (OPA(n)) connected to gold electrodes through such an akynyl moiety in ambient conditions. The molecules bind to the gold leads through an sp-hybridized carbon atom at each side. Comparing our results with other families of molecules that present organometallic C-Au bonds, we conclude that the conductance of molecules contacted via an sp-hybridized carbon atom is lower than the ones using sp3 hybridization due to strong differences in the coupling of the conducting orbitals with the gold leads.