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Published on: May 9, 2014
Kinetics of desorption of alkanethiolates on gold
Noshir S Pesika1, Kathleen J Stebe, Peter C Searson
1Department of Chemical and Biomolecular Engineering, Johns Hopkins University, Baltimore, Maryland 21218, USA.
Abstract:
Self-assembled monolayers (SAMs) of alkanethiols can undergo reductive desorption and oxidative re-adsorption. The Coulombic efficiency of the oxidative re-adsorption reaction is dependent on the chain length and solution pH. We show that the loss of alkanethiols from the surface after reductive desorption can be explained by a simple model that takes into account diffusion of the thiolate into the bulk solution at a rate that is determined by the bulk solubility. These results provide a quantitative basis for the determination of the loss of alkanethiols from the surface after reductive desorption.
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