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The conductance of porphyrin-based molecular nanowires increases with length

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Algethami, Norah, Sadeghi, Hatef, Sangtarash, Sara and Lambert, Colin J. (2018) The conductance of porphyrin-based molecular nanowires increases with length. Nano Letters, 18 (7). pp. 4482-4486. doi:10.1021/acs.nanolett.8b01621

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Official URL: http://dx.doi.org/10.1021/acs.nanolett.8b01621

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Abstract

High electrical conductance molecular nanowires are highly desirable components for future molecular-scale circuitry, but typically molecular wires act as tunnel barriers and their conductance decays exponentially with length. Here, we demonstrate that the conductance of fused-oligo-porphyrin nanowires can be either length independent or increase with length at room temperature. We show that this negative attenuation is an intrinsic property of fused-oligo-porphyrin nanowires, but its manifestation depends on the electrode material or anchor groups. This highly desirable, nonclassical behavior signals the quantum nature of transport through such wires. It arises because with increasing length the tendency for electrical conductance to decay is compensated by a decrease in their highest occupied molecular orbital–lowest unoccupied molecular orbital gap. Our study reveals the potential of these molecular wires as interconnects in future molecular-scale circuitry.

Item Type: Journal Article
Subjects: Q Science > QC Physics
Q Science > QP Physiology
T Technology > TK Electrical engineering. Electronics Nuclear engineering
Divisions: Faculty of Science > Engineering
Library of Congress Subject Headings (LCSH): Molecular electronics, Conduction band, Porphyrins , Nanowires
Journal or Publication Title: Nano Letters
Publisher: American Chemical Society
ISSN: 1530-6984
Official Date: 2018
Dates:
DateEvent
2018Published
11 July 2018Available
Date of first compliant deposit: 11 November 2020
Volume: 18
Number: 7
Page Range: pp. 4482-4486
DOI: 10.1021/acs.nanolett.8b01621
Status: Peer Reviewed
Publication Status: Published
Access rights to Published version: Open Access
RIOXX Funder/Project Grant:
Project/Grant IDRIOXX Funder NameFunder ID
ECF-2017-186Leverhulme Trusthttp://dx.doi.org/10.13039/501100000275
EP/ M014452/1[EPSRC] Engineering and Physical Sciences Research Councilhttp://dx.doi.org/10.13039/501100000266
EP/P027156/1[EPSRC] Engineering and Physical Sciences Research Councilhttp://dx.doi.org/10.13039/501100000266
EP/N017188/1[EPSRC] Engineering and Physical Sciences Research Councilhttp://dx.doi.org/10.13039/501100000266
EP/ N03337X/1[EPSRC] Engineering and Physical Sciences Research Councilhttp://dx.doi.org/10.13039/501100000266

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