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  Home > JCE Print > Journal of Chemical Education > Issues > 2005  > May  >
Symposium: Chemistry at the Nanometer Scale
Single-Molecule Electronic Measurements with Metal Electrodes
Stuart Lindsay
Department of Physics and Astronomy, and Department of Chemistry and Biochemistry, and the Biodesign Institute, Arizona State University, Tempe, AZ 85287
Cover
May 2005
Vol. 82 No. 5
p. 727
Abstract
The process of transferring electrons from one metal electrode to another via an intervening molecule differs from electrochemically or optically-induced electron transfer in important ways. The simplest process of ballistic electron transport with no charge localization on the molecule (tunneling) should be easy to understand quantitatively, yet experimental reports and theoretical calculations can differ by orders of magnitude. Here, we show how many of the discrepancies are resolved with measurements carefully constructed to provide data on single molecules connected to electrodes in well-defined ways. Furthermore, a number of these results are in good agreement with first-principles calculations (no adjustable parameters). The more interesting (and theoretically challenging) process of charge transport with intermediate localization by redox states can be measured in the same ways, but present theories do not yet describe these processes fully.
More Information
*  Citation
 Lindsay, Stuart. J. Chem. Educ. 2005 82 727.
*  Keywords
 Contacts to molecules*; Molecular electronics*; Single molecules*
*  History
 Created:
Last Updated:		 March 28, 2005
April 15, 2005
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