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Issue 3, 2017
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Rectification of current responds to incorporation of fullerenes into mixed-monolayers of alkanethiolates in tunneling junctions

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Abstract

This paper describes the rectification of current through molecular junctions comprising self-assembled monolayers of decanethiolate through the incorporation of C60 fullerene moieties bearing undecanethiol groups in junctions using eutectic Ga–In (EGaIn) and Au conducting probe AFM (CP-AFM) top-contacts. The degree of rectification increases with increasing exposure of the decanethiolate monolayers to the fullerene moieties, going through a maximum after 24 h. We ascribe this observation to the resulting mixed-monolayer achieving an optimal packing density of fullerene cages sitting above the alkane monolayer. Thus, the degree of rectification is controlled by the amount of fullerene present in the mixed-monolayer. The voltage dependence of R varies with the composition of the top-contact and the force applied to the junction and the energy of the lowest unoccupied π-state determined from photoelectron spectroscopy is consistent with the direction of rectification. The maximum value of rectification R = |J(+)/J(−)| = 940 at ±1 V or 617 at ±0.95 V is in agreement with previous studies on pure monolayers relating the degree of rectification to the volume of the head-group on which the frontier orbitals are localized.

Graphical abstract: Rectification of current responds to incorporation of fullerenes into mixed-monolayers of alkanethiolates in tunneling junctions

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Publication details

The article was received on 28 Oct 2016, accepted on 18 Dec 2016 and first published on 20 Dec 2016


Article type: Edge Article
DOI: 10.1039/C6SC04799H
Chem. Sci., 2017,8, 2365-2372
  • Open access: Creative Commons BY-NC license
    All publication charges for this article have been paid for by the Royal Society of Chemistry

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    Rectification of current responds to incorporation of fullerenes into mixed-monolayers of alkanethiolates in tunneling junctions

    L. Qiu, Y. Zhang, T. L. Krijger, X. Qiu, P. V. Hof, J. C. Hummelen and R. C. Chiechi, Chem. Sci., 2017, 8, 2365
    DOI: 10.1039/C6SC04799H

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