Formation of alkanethiolate self-assembled monolayers on oxidized gold surfaces

Yan, C.; Gölzhäuser, A.; Grunze, M.; Wöll, Ch.

doi:10.1021/la981054d

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Formation of alkanethiolate self-assembled monolayers on oxidized gold surfaces

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Grunze, M.
Cellular Biophysics, Max Planck Institute for Medical Research, Max Planck Society;

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Yan, C., Gölzhäuser, A., Grunze, M., & Wöll, C. (1999). Formation of alkanethiolate self-assembled monolayers on oxidized gold surfaces. Langmuir, 15(7), 2414-2419. doi:10.1021/la981054d.

Cite as: https://hdl.handle.net/21.11116/0000-0001-B927-3

Abstract

The formation of self-assembled alkanethiolate monolayers (SAMs) on oxidized gold was studied by X-ray photoelectron spectroscopy (XPS), contact angle measurements, and near edge X-ray absorption fine structure (NEXAFS) spectroscopy. Gold was oxidized by exposure to atomic oxygen in a vacuum. SAMs were prepared by two methods: (a) by immersion of the oxidized substrate into ethanolic solution and (b) via chemical vapor deposition (CVD). After both procedures two sulfur species could be distinguished by XPS, a gold thiolate and a species related to the reaction of the thiol with oxidized gold. Oxygen was found encapsulated under the self-assembled monolayer. The monolayers adsorbed from ethanolic solution were more densely packed and exhibited a smaller molecular tilt than the layers formed by CVD or SAMs prepared on clean gold surfaces.