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Issue 23, 2012
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Hydration of hydrophilic thiolate monolayers visualized by atomic force microscopy

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Abstract

Monolayers of mercaptoundecanol and mercaptoundecanoic acid were prepared on Au(111) films, immersed in aqueous solutions, and probed by frequency-modulation atomic force microscopy. The pN-order tip–surface force was observed over the monolayers as a function of vertical and lateral coordinates, together with the topography of the monolayers. The observed force distribution was modulated between adjacent OH endgroups in the mercaptoundecanol monolayer, as opposed to on top of COOH and COO endgroups in the mercaptoundecanoic acid monolayer. Models of the interfacial hydrogen bond between water and the endgroups were proposed. The force distribution was insensitive to the electrolyte composition. There was no qualitative sign of tip-induced confinement of water.

Graphical abstract: Hydration of hydrophilic thiolate monolayers visualized by atomic force microscopy

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Submitted
25 Jan 2012
Accepted
23 Mar 2012
First published
23 Mar 2012

Phys. Chem. Chem. Phys., 2012,14, 8419-8424
Article type
Paper

Hydration of hydrophilic thiolate monolayers visualized by atomic force microscopy

T. Hiasa, K. Kimura and H. Onishi, Phys. Chem. Chem. Phys., 2012, 14, 8419
DOI: 10.1039/C2CP40252A

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