Conductance Switching in Single Molecules Through Conformational Changes

Author:

Donhauser Z. J.1,Mantooth B. A.1,Kelly K. F.1,Bumm L. A.1,Monnell J. D.1,Stapleton J. J.1,Price D. W.2,Rawlett A. M.2,Allara D. L.1,Tour J. M.2,Weiss P. S.1

Affiliation:

1. Department of Chemistry, The Pennsylvania State University, University Park, PA 16802–6300, USA.

2. Department of Chemistry and Center for Nanoscale Science and Technology, Rice University, Houston, TX 77005, USA.

Abstract

We tracked over time the conductance switching of single and bundled phenylene ethynylene oligomers isolated in matrices of alkanethiolate monolayers. The persistence times for isolated and bundled molecules in either the ON or OFF switch state range from seconds to tens of hours. When the surrounding matrix is well ordered, the rate at which the inserted molecules switch is low. Conversely, when the surrounding matrix is poorly ordered, the inserted molecules switch more often. We conclude that the switching is a result of conformational changes in the molecules or bundles, rather than electrostatic effects of charge transfer.

Publisher

American Association for the Advancement of Science (AAAS)

Subject

Multidisciplinary

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