Measurement of the conductance of single conjugated molecules

Tali Dadosh, Yoav Gordin, Roman Krahne, Ilya Khivrich, Diana Mahalu, Veronica Frydman, Joseph Sperling, Amir Yacoby and Israel Bar-Joseph ()
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Tali Dadosh: Department of Condensed Matter Physics
Yoav Gordin: Department of Condensed Matter Physics
Roman Krahne: Department of Condensed Matter Physics
Ilya Khivrich: Department of Condensed Matter Physics
Diana Mahalu: Department of Condensed Matter Physics
Veronica Frydman: Weizmann Institute of Science
Joseph Sperling: Department of Organic Chemistry
Amir Yacoby: Department of Condensed Matter Physics
Israel Bar-Joseph: Department of Condensed Matter Physics

Nature, 2005, vol. 436, issue 7051, 677-680

Abstract: Abstract Electrical conduction through molecules depends critically on the delocalization of the molecular electronic orbitals and their connection to the metallic contacts. Thiolated (- SH) conjugated organic molecules are therefore considered good candidates for molecular conductors1,2: in such molecules, the orbitals are delocalized throughout the molecular backbone, with substantial weight on the sulphur–metal bonds1,2,3,4. However, their relatively small size, typically ∼1 nm, calls for innovative approaches to realize a functioning single-molecule device5,6,7,8,9,10,11. Here we report an approach for contacting a single molecule, and use it to study the effect of localizing groups within a conjugated molecule on the electrical conduction. Our method is based on synthesizing a dimer structure, consisting of two colloidal gold particles connected by a dithiolated short organic molecule12,13, and electrostatically trapping it between two metal electrodes. We study the electrical conduction through three short organic molecules: 4,4′-biphenyldithiol (BPD), a fully conjugated molecule; bis-(4-mercaptophenyl)-ether (BPE)14, in which the conjugation is broken at the centre by an oxygen atom; and 1,4-benzenedimethanethiol (BDMT), in which the conjugation is broken near the contacts by a methylene group. We find that the oxygen in BPE and the methylene groups in BDMT both suppress the electrical conduction relative to that in BPD.

Date: 2005
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DOI: 10.1038/nature03898

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