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
Accepted author manuscript, 1.14 MB, PDF document
Available under license: CC BY-NC-ND
Final published version
Research output: Contribution to Journal/Magazine › Journal article › peer-review
Research output: Contribution to Journal/Magazine › Journal article › peer-review
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TY - JOUR
T1 - Redox Control of Charge Transport in Vertical Ferrocene Molecular Tunnel Junctions
AU - Jia, C.
AU - Grace, I.M.
AU - Wang, P.
AU - Almeshal, A.
AU - Huang, Z.
AU - Wang, Y.
AU - Chen, P.
AU - Wang, L.
AU - Zhou, J.
AU - Feng, Z.
AU - Zhao, Z.
AU - Huang, Y.
AU - Lambert, C.J.
AU - Duan, X.
N1 - 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
PY - 2020/5/14
Y1 - 2020/5/14
N2 - 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).
AB - 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).
KW - molecular junctions
KW - graphene
KW - confined redox reaction
KW - charge transport
KW - ferrocene
KW - self-assembled monolayer
KW - interfacial coupling
KW - reversible switch
U2 - 10.1016/j.chempr.2020.02.018
DO - 10.1016/j.chempr.2020.02.018
M3 - Journal article
VL - 6
SP - 1172
EP - 1182
JO - Chem
JF - Chem
SN - 2451-9308
IS - 5
ER -