The conductance of porphyrin-based molecular nanowires increases with length

Algethami, Norah and Sadeghi, Hatef and Sangtarash, Sara and Lambert, Colin J. (2018) The conductance of porphyrin-based molecular nanowires increases with length. Nano Letters, 18 (7). pp. 4482-4486. ISSN 1530-6984

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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, non-classical behaviour 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 HOMO-LUMO gap. Our study reveals the potential of these molecular wires as interconnects in future molecular-scale circuitry.

Item Type: Journal Article
Journal or Publication Title: Nano Letters
Uncontrolled Keywords: /dk/atira/pure/subjectarea/asjc/3100/3104
Subjects:
Departments: Faculty of Science and Technology > Physics
ID Code: 125777
Deposited By: ep_importer_pure
Deposited On: 08 Jun 2018 12:32
Refereed?: Yes
Published?: Published
Last Modified: 19 Feb 2020 04:38
URI: https://eprints.lancs.ac.uk/id/eprint/125777

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