Single-Molecule Circuits with Well-Defined Molecular Conductance

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dc.creatorVenkataraman, Latha
dc.creatorKlare, Jennifer E.
dc.creatorTam, Iris W.
dc.creatorNuckolls, Colin
dc.creatorHybertsen, Mark S.
dc.creatorSteigerwald, Michael L.
dc.date2006-03-10
dc.date.accessioned2026-07-07T07:02:19Z
dc.date.available2026-07-07T07:02:19Z
dc.descriptionWe measure the conductance of amine-terminated molecules by breaking Au point contacts in a molecular solution at room temperature. We find that the variability of the observed conductance for the diamine molecule-Au junctions is much less than the variability for diisonitrile and dithiol-Au junctions. This narrow distribution enables unambiguous conductance measurements of single molecules. For an alkane diamine series with 2-8 carbon atoms in the hydrocarbon chain, our results show a systematic trend in the conductance from which we extract a tunneling decay constant of 0.91 +/- 0.03 per methylene group. We hypothesize that the diamine link binds preferentially to undercoordinated Au atoms in the junction. This is supported by density functional theory-based calculations that show the amine binding to a gold adatom with sufficient angular flexibility for easy junction formation but well-defined electronic coupling of the N lone pair to the Au. Therefore, the amine linkage leads to well-defined conductance measurements of a single molecule junction in a statistical study.
dc.identifierhttps://arxiv.org/abs/cond-mat/0603281
dc.identifierhttp://arxiv.org/abs/cond-mat/0603281
dc.identifierNano Letters, Vol 6, #3, p458, 2006
dc.identifierdoi:10.1021/nl052373+
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/108560
dc.subjectMaterials Science
dc.titleSingle-Molecule Circuits with Well-Defined Molecular Conductance
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