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Conductance Switching in Single Molecules Through Conformational Changes
Z. J. Donhauser,1B. A. Mantooth,1K. F. Kelly,1L. A. Bumm,1J. D. Monnell,1J. J. Stapleton,1D.
W. Price Jr.,2A. M. Rawlett,2*D.
L. Allara,1J. M. Tour,2P. S. Weiss1
We tracked over time the conductance switching of single
and bundled phenylene ethynylene oligomers isolated in matrices ofalkanethiolate monolayers. The persistence times for isolatedand
bundled molecules in either the ON or OFF switch state rangefrom
seconds to tens of hours. When the surrounding matrix iswell ordered,
the rate at which the inserted molecules switchis low. Conversely,
when the surrounding matrix is poorly ordered,the inserted molecules
switch more often. We conclude that theswitching is a result of
conformational changes in the moleculesor bundles, rather than
electrostatic effects of charge transfer.
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.
*
Present address: Motorola, 7700 South River Parkway, Tempe, AZ 85248, USA.
To whom correspondence should be addressed. E-mail:
dla3{at}psu.edu (D.L.A.); tour{at}rice.edu (J.M.T.); stm{at}psu.edu
(P.S.W.)
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