Citation:O'Dwyer, C. (2005)'STM Observation of Sulfur Dimerization in Alkanethiol Self-Assembled Monolayers on Au{111}', 207th Meeting of the Electrochemical Society: Electrocatalysis. Quebec, Canada, 15-20 May, 2005. Pennington, NJ: The Electrochemical Society, 11, pp. 123-132.
Abstract:
We present for the first time, direct microscopical observation by STM of
sulfur dimer formation on alkanethiol self-assembled monolayers (SAM) on
sputtered Au substrates. The sulfur dimers are observed when imaging at a
bias where the tip-molecule interaction occurs, and are formed by
displacement of sulfur atoms from their normal three-fold hollow site
residence of the (4 × 2) superlattice to nearest-neighbor bridge-site
residence between two Au atoms. The displacement is believed to occur due
to defects induced in the alkyl chain of the monolayer due to the proximity
of the STM tip. Only one of the sulfur atoms forming the dimer is bound to
the surface and they are commensurate with the Au{111} adlattice along its
[112] directions.
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