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Nanoscale. 2013 Jul 7;5(13):5715-9. doi: 10.1039/c3nr01284k. Epub 2013 May 28.

Measurements of contact specific low-bias negative differential resistance of single metalorganic molecular junctions.

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  • 1Single Molecule Study Laboratory, College of Engineering and Nanoscale Science and Engineering Center, University of Georgia, Athens, GA 30602, USA.


Negative differential resistance (NDR) behaviors of single molecule junctions composed of a thiol-terminated Ru(ii) bis-terpyridine (Ru(tpy-SH)2) molecule sandwiched between two gold electrodes are measured using a specifically modified scanning probe microscope break junction technique (SPMBJ) at room temperature. The low-bias (0.623 ± 0.135 V) NDR observed for one of the three conductance groups is contact specific and is caused by a bias induced electrode-molecule coupling changes.

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