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dc.contributor.authorNoori, M.
dc.contributor.authorAragonès, A.
dc.contributor.authorDi Palma, G.
dc.contributor.authorDarwish, Nadim
dc.contributor.authorBailey, S.
dc.contributor.authorAl-Galiby, Q.
dc.contributor.authorGrace, I.
dc.contributor.authorAmabilino, D.
dc.contributor.authorGonzález-Campo, A.
dc.contributor.authorDíez-Pérez, I.
dc.contributor.authorLambert, C.
dc.identifier.citationNoori, M. and Aragonès, A. and Di Palma, G. and Darwish, N. and Bailey, S. and Al-Galiby, Q. and Grace, I. et al. 2016. Tuning the electrical conductance of metalloporphyrin supramolecular wires. Scientific Reports. 6: Article 37352.

In contrast with conventional single-molecule junctions, in which the current flows parallel to the long axis or plane of a molecule, we investigate the transport properties of M(II)-5,15-diphenylporphyrin (M-DPP) single-molecule junctions (M=Co, Ni, Cu, or Zn divalent metal ions), in which the current flows perpendicular to the plane of the porphyrin. Novel STM-based conductance measurements combined with quantum transport calculations demonstrate that current-perpendicular-to-the-plane (CPP) junctions have three-orders-of-magnitude higher electrical conductances than their current-in-plane (CIP) counterparts, ranging from 2.10-2 G0 for Ni-DPP up to 8.10-2 G0 for Zn-DPP. The metal ion in the center of the DPP skeletons is strongly coordinated with the nitrogens of the pyridyl coated electrodes, with a binding energy that is sensitive to the choice of metal ion. We find that the binding energies of Zn-DPP and Co-DPP are significantly higher than those of Ni-DPP and Cu-DPP. Therefore when combined with its higher conductance, we identify Zn-DPP as the favoured candidate for high-conductance CPP single-molecule devices.

dc.publisherNature Publishing Group
dc.titleTuning the electrical conductance of metalloporphyrin supramolecular wires
dc.typeJournal Article
dcterms.source.titleScientific Reports

This open access article is distributed under the Creative Commons license

curtin.departmentNanochemistry Research Institute
curtin.accessStatusOpen access

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