Journal
NANO LETTERS
Volume 20, Issue 9, Pages 6899-6907Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.0c03000
Keywords
diazonium electroreduction; single-molecule junctions; molecular electronics; tunneling; hopping
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Funding
- Agence Nationale de la Recherche (France) [ANR-15-CE09 0001-01]
- China Scholar Council
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Thin layers of cobalt and ruthenium polypyridyl-oligomers with thicknesses between 2 and 8 nm were deposited on gold by electrochemical reduction of diazonium salts. A scanning tunneling microscope was used to create single-molecule junctions (SMJs). The charge transport properties of the Au-[Co(tpy)(2)](n)-Au (n = 1-4) SMJs do not depend markedly on the oligomer length, have an extremely low attenuation factor (beta similar to 0.19 nm(-1)), and do not show a thickness-dependent transition between two mechanisms. Resonant charge transport is proposed as the main transport mechanism. The SMJ conductance decreases by 1 order of magnitude upon changing the metal from Co to Ru. In Au-[Ru(tpy)(2)](n)-Au and Au-[Ru(bpy)(3)](n)-Au SMJs, a charge transport transition from direct tunneling to hopping is evidenced by a break in the length-dependent beta-plot. The three different mechanisms observed are a clear molecular signature on transport in SMJs. Most importantly, these results are in good agreement with those obtained on large-area molecular junctions.
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