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Formation électro-assistée de monocouches auto-assemblées sur or. Suivi in situ et effets du potentiel appliqué à l'électrode sur le mécanisme de formation

Abstract : Create specific surfaces appears as a major issue in chemistry. The formation of self-assembled monolayers (SAMs) using sulfur derivatives is one of the most commonly used strategy to modify gold surfaces. Nowadays, the formation mechanism of self-assembled monolayers (SAMs) on gold is still investigated.A new electrochemical approach for SAMs formation has recently been developed allowing an in situ and real time monitoring of the chemisorption of various sulfur compounds including dithiolane derivatives. Unlike standard adsorption methods which consist in a simple immersion, this approach tends to facilitate the chemisorption by polarizing the electrode. The high temporal resolution coupled to this good reproducibility highlight an adsorption mechanism which proceeds by a nucleation-growth process. This type of mechanism, already identified for the SAMs formation in the gas phase, has never been reported in the liquid phase.In addition, this method allows the preparation of binary mixed monolayers in a controlled and predictable manner. Knowing the affinity constants, it is possible to produce SAMs whose surface proportions reflect those in solution.Finally, to better understand the key factors governing the SAMs formation mechanism, a systematic study depending on the nature of the anchoring group has highlighted a significant difference between the different anchoring groups for the kinetics as well as for the stability of the monolayer.
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Submitted on : Thursday, October 11, 2018 - 1:02:19 AM
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  • HAL Id : tel-01893015, version 1

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Dany Capitao. Formation électro-assistée de monocouches auto-assemblées sur or. Suivi in situ et effets du potentiel appliqué à l'électrode sur le mécanisme de formation. Autre. Université Sorbonne Paris Cité, 2016. Français. ⟨NNT : 2016USPCC215⟩. ⟨tel-01893015⟩

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