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Diffusion of Au(CH3S)2 on Au(111) Observed with the Scanning Tunneling Microscope

Scott Holmes, Richard Palmer Orcid Logo, Quanmin Guo

The Journal of Physical Chemistry C, Volume: 123, Issue: 39, Pages: 24104 - 24110

Swansea University Author: Richard Palmer Orcid Logo

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DOI (Published version): 10.1021/acs.jpcc.9b06852

Abstract

The diffusion of a three-legged molecule, CH3S–Au–SCH3, on Au(111) has been investigated using scanning tunneling microscopy. Each of the two S atoms forms a bond with a Au atom in the Au(111) substrate. The Au atom in the molecule provides the third anchoring point via its interaction with Au(111)....

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Published in: The Journal of Physical Chemistry C
ISSN: 1932-7447 1932-7455
Published: 2019
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URI: https://cronfa.swan.ac.uk/Record/cronfa52512
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Abstract: The diffusion of a three-legged molecule, CH3S–Au–SCH3, on Au(111) has been investigated using scanning tunneling microscopy. Each of the two S atoms forms a bond with a Au atom in the Au(111) substrate. The Au atom in the molecule provides the third anchoring point via its interaction with Au(111). CH3S–Au–SCH3 hops as a single unit without breaking any of the S–Au bonds within the molecule at temperatures below 170 K, with an activation energy of 66 meV. The CH3S–Au–SCH3 molecules have a tendency to aggregate into rows driven by an attractive potential between neighboring molecules, with the minimum row consisting of just two molecules in the form of a dimer. The dimer is much less mobile than a single molecule due to the attractive potential between the two molecules. The dimer is observed apparently to hop as a single unit with an activation energy of 210 meV. Detachment of a CH3S–Au–SCH3 molecule from the end of a row consisting of three or more molecules takes place with an activation energy of 320 meV.
College: Faculty of Science and Engineering
Issue: 39
Start Page: 24104
End Page: 24110

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