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

[thumbnail of Ferrocene_Manuscript_2019_9_24_]

Text (Ferrocene_Manuscript_2019_9_24_)
Ferrocene_Manuscript_2019_9_24_.pdf - Accepted Version
Available under License Creative Commons Attribution Non-commercial No Derivatives.
Download (1MB)

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).

Item Type:

Journal Article

Journal or Publication Title:

Chem

Additional Information:

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

Subjects:

?? molecular junctionsgrapheneconfined redox reactioncharge transportferroceneself-assembled monolayerinterfacial couplingreversible switch ??

Departments:

Faculty of Science and Technology > Physics

ID Code:

154114

Deposited By:

ep_importer_pure

Deposited On:

22 Apr 2021 13:50

Refereed?:

Yes

Published?:

Published

Last Modified:

02 Sep 2024 23:57

URI:

https://eprints.lancs.ac.uk/id/eprint/154114