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1,6-Hexanedithiol Self-Assembled Monolayers on Au(111) Investigated by Electrochemical, Spectroscopic, and Molecular Mechanics Methods

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Title: 1,6-Hexanedithiol Self-Assembled Monolayers on Au(111) Investigated by Electrochemical, Spectroscopic, and Molecular Mechanics Methods
Authors: Qu, Deyu Browse this author
Kim, Byung-Cheol Browse this author
Lee, Chi-Woo J. Browse this author
Ito, Mikio Browse this author
Noguchi, Hidenori Browse this author →KAKEN DB
Uosaki, Kohei Browse this author →KAKEN DB
Issue Date: 14-Jan-2010
Publisher: American Chemical Society
Journal Title: Journal of Physical Chemistry C
Volume: 114
Issue: 1
Start Page: 497
End Page: 505
Publisher DOI: 10.1021/jp908821b
Abstract: 1,6-Hexanedithiol (HSC6SH) self-assembled monolayers (SAMs) on Au(111) were formed in a 1 mM ethanolic solution and were investigated by voltammetry in 0.1 M aqueous KOH solution. HSC6SH SAMs on Au(111) were further probed by X-ray photoelectron spectroscopy (XPS), scanning tunneling microscopy (STM), sum frequency generation spectroscopy (SFG), and molecular mechanics calculation (MMC). An identical investigation was performed with the self-assembly of hexanethiol (C6SH) on Au(111) for comparison. Linear sweep voltammograms showed that a full monolayer of thiolate (7.6 (±0.2) × 10^[-10] mol^[-2]) chemisorbed on Au(111) with both HSC6SH and C6SH, while the peak potential of the electroreduction of the former assembly was more negative than that of the latter. XPS revealed that two different forms of sulfur existed at HSC6SH SAMs on Au(111), i.e. a thiolate and a thiol. The STM image could not be resolved with HSC6SH SAMs, while it was atomically well-defined with the C6SH case. SFG results showed that alkyl chains within the HSC6SH SAMs were in an all-trans conformation. Thus the experimental results concluded that densely packed and higly oriented HSC6SH SAMs could be successfully formed on Au(111) with the incubation conditions in the practical solution. MMC presented that HSC6SH SAMs were more stable than C6SH ones because of the additional end-end interaction among the thiol groups faced up to the air, albeit both SAMs were tilted by 28° from the surface normal.
Type: article
URI: http://hdl.handle.net/2115/50207
Appears in Collections:理学院・理学研究院 (Graduate School of Science / Faculty of Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 魚崎 浩平

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