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  • Ferrocene_Manuscript_2019_9_24_

    Rights statement: This is the author’s version of a work that was accepted for publication in Chem. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Chem, 6, 5, 2020 DOI: 10.1016/j.chempr.2020.02.018

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Redox Control of Charge Transport in Vertical Ferrocene Molecular Tunnel Junctions

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<mark>Journal publication date</mark>14/05/2020
<mark>Journal</mark>Chem
Issue number5
Volume6
Number of pages11
Pages (from-to)1172-1182
Publication StatusPublished
Early online date19/03/20
<mark>Original language</mark>English

Abstract

Controlling charge transport through molecular tunnel junctions is of crucial importance for exploring basic physical and chemical mechanisms at the molecular level and realizing the applications of molecular devices. Here, through a combined experimental and theoretical investigation, we demonstrate redox control of cross-plane charge transport in a vertical gold/self-assembled monolayer (SAM)/graphene tunnel junction composed of a ferrocene-based SAM. When an oxidant/reductant or electrochemical control is applied to the outside surface of the neutral single-layer graphene top electrode, reversible redox reactions of ferrocene groups take place with charges crossing the graphene layer. This leads to counter anions on the outer surface of graphene, which balance the charges of ferrocene cations in the oxidized state. Correspondingly, the junctions switch between a high-conductance, neutral state with asymmetrical characteristics and a low-conductance, oxidized state with symmetrical characteristics, yielding a large on/off ratio (>100).

Bibliographic note

This is the author’s version of a work that was accepted for publication in Chem. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Chem, 6, 5, 2020 DOI: 10.1016/j.chempr.2020.02.018