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Science 22 March 1996:
Vol. 271. no. 5256, pp. 1705 - 1707
DOI: 10.1126/science.271.5256.1705
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Reports

Are Single Molecular Wires Conducting?

L. A. Bumm, J. J. Arnold, M. T. Cygan, T. D. Dunbar, T. P. Burgin, L. Jones II, D. L. Allara, * J. M. Tour, * P. S. Weiss *

Molecular wire candidates inserted into ``nonconducting'' n-dodecanethiol self-assembled monolayers on Au{111} were probed by scanning tunneling microscopy (STM) and microwave frequency alternating current STM at high tunnel junction impedance (100 gigohms) to assess their electrical properties. The inserted conjugated molecules, which were 4,4'-di(phenylene-ethynylene)benzenethiolate derivatives, formed single molecular wires that extended from the Au{111} substrate to about 7 angstroms above and had very high conductivity as compared with that of the alkanethiolate.

L. A. Bumm, J. J. Arnold, M. T. Cygan, T. D. Dunbar, P. S. Weiss, Department of Chemistry, Pennsylvania State University, University Park, PA 16802, USA.
T. P. Burgin, L. Jones II, J. M. Tour, Department of Chemistry and Biochemistry, University of South Carolina, Columbia, SC 29208, USA.
D. L. Allara, Departments of Chemistry and Materials Science, Pennsylvania State University, University Park, PA 16802, USA.
* To whom correspondence should be addressed.


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