STM observation of sulfur dimerization in alkanethiol self-assembled monolayers on Au{111}
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Date
2005-01
Authors
O'Dwyer, Colm
Journal Title
Journal ISSN
Volume Title
Publisher
The Electrochemical Society
Published Version
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.
Description
Keywords
Self-assembled monolayers (SAM) , Au substrate , Sulfur dimers , Superlattice , Alkyl chain , Au{111} , Tip-molecule
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.
Copyright
© The Electrochemical Society, Inc. 2005. All rights reserved. Except as provided under U.S. copyright law, this work may not be reproduced, resold, distributed, or modified without the express permission of The Electrochemical Society (ECS). The archival version of this work was published in 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.