Potential-assisted deposition of mixed alkanethiol self-assembled monolayers
Fiche publication
Date publication
mars 2010
Auteurs
Membres identifiés du Cancéropôle Est :
Pr FINOT Eric
Tous les auteurs :
Meunier-Prest R, Legay G, Raveau S, Chiffot N, Finot E
Lien Pubmed
Résumé
Preparation of self-assembled monolayers (SAMs) usually involves passive incubation. The recently developed potential-assisted deposition is indeed more selective as well as 100-fold faster than passive adsorption, thereby enhancing the reproducibility of the monolayer deposition. This article aims to identify the electrodeposition conditions necessary to prepare mixed alkanethiol SAMs on gold surface. Parameters such as concentrations in solution, electrode polarization and deposition time were examined for two chain lengths, C-3 (mercaptopropionic acid, MPA) and C-18 (octadecanethiol, ODT). The kinetics and composition of the SAMs were systematically characterized by reductive stripping analysis and by surface plasmon enhanced ellipsometry. Control of the surface concentration of the stable binary SAM was achieved by carefully adjusting the MPA fraction at between 70% and 95% in the deposition solution. Three theoretical models were developed. For MPA or ODT SAMs, whatever the adsorbate and the time period, the second order model gives the best fit. For the binary monolayer (MPA-ODT), a co-adsorption model was developed to describe the kinetics before 10 s. (C) 2010 Elsevier Ltd. All rights reserved.
Référence
Electrochim Acta. 2010 Mar 1;55(8):2712-20