Redox Control of Charge Transport in Vertical Ferrocene Molecular Tunnel Junctions

Jia, C. and Grace, I.M. and Wang, P. and Almeshal, A. and Huang, Z. and Wang, Y. and Chen, P. and Wang, L. and Zhou, J. and Feng, Z. and Zhao, Z. and Huang, Y. and Lambert, C.J. and Duan, X. (2020) Redox Control of Charge Transport in Vertical Ferrocene Molecular Tunnel Junctions. Chem, 6 (5). pp. 1172-1182. ISSN 2451-9308

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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).

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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
?? molecular junctionsgrapheneconfined redox reactioncharge transportferroceneself-assembled monolayerinterfacial couplingreversible switch ??
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22 Apr 2021 13:50
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02 Jan 2024 00:23