Linker dependent bond rupture force measurements in single-molecule junctions
Frei M, Aradhya SV, Hybertsen MS, Venkataraman L. 2012. Linker dependent bond rupture force measurements in single-molecule junctions. Journal of the American Chemical Society. 134(9), 4003–4006.
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Journal Article
| Published
| English
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Author
Frei, Michael;
Aradhya, Sriharsha V.;
Hybertsen, Mark S.;
Venkataraman, LathaISTA 

Abstract
We use a modified conducting atomic force microscope to simultaneously probe the conductance of a single-molecule junction and the force required to rupture the junction formed by alkanes terminated with four different chemical link groups which vary in binding strength and mechanism to the gold electrodes. Molecular junctions with amine, methylsulfide, and diphenylphosphine terminated molecules show clear conductance signatures and rupture at a force that is significantly smaller than the measured 1.4 nN force required to rupture the single-atomic gold contact. In contrast, measurements with a thiol terminated alkane which can bind covalently to the gold electrode show conductance and force features unlike those of the other molecules studied. Specifically, the strong Au–S bond can cause structural rearrangements in the electrodes, which are accompanied by substantial conductance changes. Despite the strong Au–S bond and the evidence for disruption of the Au structure, the experiments show that on average these junctions also rupture at a smaller force than that measured for pristine single-atom gold contacts.
Publishing Year
Date Published
2012-02-16
Journal Title
Journal of the American Chemical Society
Publisher
American Chemical Society
Volume
134
Issue
9
Page
4003-4006
ISSN
eISSN
IST-REx-ID
Cite this
Frei M, Aradhya SV, Hybertsen MS, Venkataraman L. Linker dependent bond rupture force measurements in single-molecule junctions. Journal of the American Chemical Society. 2012;134(9):4003-4006. doi:10.1021/ja211590d
Frei, M., Aradhya, S. V., Hybertsen, M. S., & Venkataraman, L. (2012). Linker dependent bond rupture force measurements in single-molecule junctions. Journal of the American Chemical Society. American Chemical Society. https://doi.org/10.1021/ja211590d
Frei, Michael, Sriharsha V. Aradhya, Mark S. Hybertsen, and Latha Venkataraman. “Linker Dependent Bond Rupture Force Measurements in Single-Molecule Junctions.” Journal of the American Chemical Society. American Chemical Society, 2012. https://doi.org/10.1021/ja211590d.
M. Frei, S. V. Aradhya, M. S. Hybertsen, and L. Venkataraman, “Linker dependent bond rupture force measurements in single-molecule junctions,” Journal of the American Chemical Society, vol. 134, no. 9. American Chemical Society, pp. 4003–4006, 2012.
Frei M, Aradhya SV, Hybertsen MS, Venkataraman L. 2012. Linker dependent bond rupture force measurements in single-molecule junctions. Journal of the American Chemical Society. 134(9), 4003–4006.
Frei, Michael, et al. “Linker Dependent Bond Rupture Force Measurements in Single-Molecule Junctions.” Journal of the American Chemical Society, vol. 134, no. 9, American Chemical Society, 2012, pp. 4003–06, doi:10.1021/ja211590d.
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PMID: 22338625
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