The diffusion of Au(CH3S)2 on Au(111) observed with the Scanning Tunneling Microscope

Scott Holmes, Richard Palmer, Quanmin Guo

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)
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The diffusion of a three-legged molecule, CH3S-Au-SCH3, on Au(111) has been investigated using scanning tunnelling 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 neighbouring 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 three or more molecules takes place with an activation energy of 320 meV.
Original languageEnglish
Pages (from-to)24104-24110
Number of pages7
JournalJournal of Physical Chemistry C
Issue number39
Early online date12 Sept 2019
Publication statusPublished - 3 Oct 2019

Bibliographical note

Copyright © 2019 American Chemical Society

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Energy(all)
  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films


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