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Adhesion behaviour of self-assembled alkanethiol monolayers on silver at different stages of growth

Sai, Phanindra T and Raychaudhuri, AK (2007) Adhesion behaviour of self-assembled alkanethiol monolayers on silver at different stages of growth. In: Journal of Physics D: Applied Physics, 40 (10). pp. 3182-3189.

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Abstract

We studied the development of interfacial energy $\gamma$ of alkanethiol self-assembled monolayers on Ag/mica substrates by force-displacement spectroscopy using an atomic force microscope. Self-assembled monolayers of decanethiol $[CH_3 (CH_2)_9SH]$ and octadecanethiol $[CH_3 (CH_2)_{17}SH]$ were studied. The growth of the monolayer as a function of time was studied by an ellipsometer for three different concentrations of decanethiol and octadecanethiol. The thiols led to well-ordered self-assembled monolayer that showed atomic resolution images by lateral force microscopy mode. The behaviour of $\gamma$ showed non-monotonic variation in stages of adsorption, which was more prominent for short chain length decanethiol. The $\gamma$ reached a limiting value of $12 mJ \hspace{2mm}m^{-2}$ for decanethiol and $7 mJ \hspace{2mm}m^{-2}$ for octadecanethiol.

Item Type: Journal Article
Additional Information: Copyright of this article belongs to Institute of Physics (IOP).
Department/Centre: Division of Physical & Mathematical Sciences > Physics
Date Deposited: 14 Aug 2007
Last Modified: 19 Sep 2010 04:39
URI: http://eprints.iisc.ernet.in/id/eprint/11706

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