Tunneling-to-Hopping Transition in Multiheme Cytochrome Bioelectronic Junctions

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F60076658%3A12310%2F23%3A43907580" target="_blank" >RIV/60076658:12310/23:43907580 - isvavai.cz</a>

Výsledek na webu

<a href="https://pubs.acs.org/doi/10.1021/acs.jpclett.2c03361" target="_blank" >https://pubs.acs.org/doi/10.1021/acs.jpclett.2c03361</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1021/acs.jpclett.2c03361" target="_blank" >10.1021/acs.jpclett.2c03361</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Tunneling-to-Hopping Transition in Multiheme Cytochrome Bioelectronic Junctions

Popis výsledku v původním jazyce

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 (&gt; 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 (beta = 0.2 angstrom(-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 similar to 7 nm, thus enabling transport on the micrometer scale with a shallow polynomial (similar to 1/r) distance decay.

Název v anglickém jazyce

Tunneling-to-Hopping Transition in Multiheme Cytochrome Bioelectronic Junctions

Popis výsledku anglicky

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 (&gt; 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 (beta = 0.2 angstrom(-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 similar to 7 nm, thus enabling transport on the micrometer scale with a shallow polynomial (similar to 1/r) distance decay.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10403 - Physical chemistry

Projekt

<a href="/cs/project/GJ20-02067Y" target="_blank" >GJ20-02067Y: Přenos elektrického náboje na nabitých heterogenních rozhraních s redoxními metaloproteiny</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2023

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

JOURNAL OF PHYSICAL CHEMISTRY LETTERS

ISSN

1948-7185

e-ISSN

—

Svazek periodika

14

Číslo periodika v rámci svazku

2

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

8

Strana od-do

445-452

Kód UT WoS článku

000924930400001

EID výsledku v databázi Scopus

2-s2.0-85146190277