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The conductance of porphyrin-based molecular nanowires increases with length

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<mark>Journal publication date</mark>07/2018
<mark>Journal</mark>Nano Letters
Issue number7
Number of pages5
Pages (from-to)4482-4486
Publication StatusPublished
Early online date7/06/18
<mark>Original language</mark>English


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.