Journal
NANO LETTERS
Volume 11, Issue 4, Pages 1518-1523Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nl1042903
Keywords
Molecular conductance; force spectroscopy; gold point contact; bond rupture; break-junction
Categories
Funding
- NSF [CHE-07-44185]
- Nanoscale Science and Engineering Initiative of the NSF [CHE-0117752, CHE-0641523]
- New York State Office of Science, Technology and Academic Research (NYSTAR)
- U.S. Department of Energy, Office of Basic Energy Sciences [DE-AC02-98CH10886]
- Direct For Mathematical & Physical Scien
- Division Of Chemistry [0744185] Funding Source: National Science Foundation
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We simultaneously measure conductance and force across nanoscale junctions. A new, two-dimensional histogram technique is introduced to statistically extract bond rupture forces from a large data set of individual junction elongation traces. For the case of Au point contacts, we find a rupture force of 1.4 +/- 0.2 nN, which is in good agreement with previous measurements. We then study systematic trends for single gold metal molecule metal junctions for a series of molecules terminated with amine and pyridine linkers. For all molecules studied, single molecule junctions rupture at the Au-N bond. Selective binding of the linker group allows us to correlate the N-Au bond-rupture force to the molecular backbone. We find that the rupture force ranges from 0.8 nN for 4,4' bipyridine to 0.5 nN in 1,4 diaminobenzene. These experimental results are in excellent quantitative agreement with density functional theory based adiabatic molecular junction elongation and rupture calculations.
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