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Oligoyne Single Molecule Wires

Author:
Wang, Changsheng; Batsanov, Andrei S.; Bryce, Martin R.; Martín, Santiago; Nichols, Richard J.; Higgins, Simon J.; García Suárez, Víctor ManuelUniovi authority; Lambert, Colin J.
Subject:

Electrónica molecular

nanotecnología

Publication date:
2009-11
Editorial:

American Chemical Society

Publisher version:
http://dx.doi.org/10.1021/ja9061129
Citación:
Journal of the American Chemical Society, 131 (43), p. 15647–15654 (2009); doi:10.1021/ja9061129
Descripción física:
p. 15647-15654
Abstract:

We report the electrical conductance at the single molecule level of the oligoyne molecular wires Py-(CtC)n-Py (n ) 1, 2 and 4; Py ) 4-pyridyl) using STM-molecular break junction techniques in Au|molecule|Au configurations. All three conduction groups in the oligoyne series show a remarkably low value of (0.06 ( 0.03) Å-1, that is, the conductance is almost independent of molecular length. 4,4′-Bipyridyl studied under the same conditions does not follow this exponential decay series. Theoretical calculations using a combination of density functional theory and nonequilibrium Green’s function formalism support the experimental results. We conclude that oligoynes and polyynes are a very promising class of molecular wires for integration into electronic circuits

We report the electrical conductance at the single molecule level of the oligoyne molecular wires Py-(CtC)n-Py (n ) 1, 2 and 4; Py ) 4-pyridyl) using STM-molecular break junction techniques in Au|molecule|Au configurations. All three conduction groups in the oligoyne series show a remarkably low value of (0.06 ( 0.03) Å-1, that is, the conductance is almost independent of molecular length. 4,4′-Bipyridyl studied under the same conditions does not follow this exponential decay series. Theoretical calculations using a combination of density functional theory and nonequilibrium Green’s function formalism support the experimental results. We conclude that oligoynes and polyynes are a very promising class of molecular wires for integration into electronic circuits

Description:

The conductance histograms reveal multiple series of peaks attributed to differing contact geometries between the pyridyl head groups and the gold electrodes. Both experimental and theoretical evidence point to the higher conduction groups being related to adsorption of the pyridyl group at more highly coordinated sites such as step edges or alongside gold adatoms.

URI:
http://hdl.handle.net/10651/26072
ISSN:
0002-7863; 1520-5126
DOI:
10.1021/ja9061129
Patrocinado por:

This work was supported by EPSRC under grants EP/C00678X/1 (Mechanisms of Single Molecule Conductance) and GR/S84064/01 (Controlled Electron Transport Through Single Molecules), QinetiQ and the British Department of Trade and Industry, Royal Society, Northwest Regional Development Agency, the EC FP7 ITN FUNMOLS project no. 212942 and the EC FP7 ITN NANOCTM.

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