Futera, Zdenek;
Wu, Xiaojing;
Blumberger, Jochen;
(2023)
Tunneling-to-Hopping Transition in Multiheme Cytochrome Bioelectronic Junctions.
Journal of Physical Chemistry Letters
, 14
(2)
pp. 445-452.
10.1021/acs.jpclett.2c03361.
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Abstract
Multiheme cytochromes (MHCs) have attracted much interest for use in nanobioelectronic junctions due to their high electronic conductances. Recent measurements on dry MHC junctions suggested that a coherent tunneling mechanism is operative over surprisingly long long distances (>3 nm), which challenges our understanding of coherent transport phenomena. Here we show that this is due to (i) a low exponential distance decay constant for coherent conduction in MHCs (β = 0.2 Å-1) and (ii) a large density of protein electronic states which prolongs the coherent tunneling regime to distances that exceed those in molecular wires made of small molecules. Incoherent hopping conduction is uncompetitive due to the large energy level offset at the protein-electrode interface. Removing this offset, e.g., by gating, we predict that the transport mechanism crosses over from coherent tunneling to incoherent hopping at a protein size of ∼7 nm, thus enabling transport on the micrometer scale with a shallow polynomial (∼1/r) distance decay.
| Type: | Article |
|---|---|
| Title: | Tunneling-to-Hopping Transition in Multiheme Cytochrome Bioelectronic Junctions |
| Location: | United States |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1021/acs.jpclett.2c03361 |
| Publisher version: | https://doi.org/10.1021/acs.jpclett.2c03361 |
| Language: | English |
| Additional information: | This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions. |
| Keywords: | Science & Technology, Physical Sciences, Technology, Chemistry, Physical, Nanoscience & Nanotechnology, Materials Science, Multidisciplinary, Physics, Atomic, Molecular & Chemical, Chemistry, Science & Technology - Other Topics, Materials Science, Physics, ELECTRON-TRANSPORT, CHARGE-TRANSFER, BACTERIAL NANOWIRES, PROTEINS, FLOW, MECHANISMS, INTERFACES, AU(111), GOIP |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy |
| URI: | https://discovery-pp.ucl.ac.uk/id/eprint/10166220 |
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