title: Influence of modification time and high frequency ultrasound irradiation on self-assembling of alkylphosphonic acids on stainless steel: Electrochemical and spectroscopic studies.
abstract: Self-assembly of alkylphosphonic acids on stainless steel was investigated under different conditions. Four different alkylphosphonic acids exhibiting alkyl chain of various size were synthesized and studied: butylphosphonic acid (C4P), octylphosphonic acid (C8P), decylphosphonic acid (C10P), and hexadecylphosphonic acid (C16P). Electrochemistry experiments were extensively carried out in order to determine electrochemical surface blocking of adsorbed layers in function of grafting time. In term of surface blocking, an 8h modification time was optimal for all alkylphosphonic acids. Longer immersion times lead to degradation of adsorbed layers. For the first time, grafting of C16P was studied under high frequency ultrasound irradiation. Interestingly, grafting process is highly accelerated under sonication and well-covering C16P modified substrates are obtained after 1h of immersion under ultrasound irradiation. This would allow to elaborate high-quality alkylphosphonic acids modified samples within much shorter times. Water contact angles measurements and X-ray Photoelectrons Spectroscopy (XPS) confirmed presence of adsorbed alkylphosphonic acids on stainless steel surface. A very tight link between electrochemical blocking, surface hydrophobicity and species chemical grafting was established.
authors.affiliation: Institut UTINAM, UMR 6213 CNRS, Université de Franche-Comté, 30 Avenue de l'Observatoire, 25009 Besançon Cedex, France.
authors.forename: Florian
authors.initials: F
authors.lastname: Roy
authors.affiliation: Institut UTINAM, UMR 6213 CNRS, Université de Franche-Comté, 30 Avenue de l'Observatoire, 25009 Besançon Cedex, France.
authors.forename: Abdeslam
authors.initials: A
authors.lastname: Et Taouil
authors.affiliation: Institut UTINAM, UMR 6213 CNRS, Université de Franche-Comté, 30 Avenue de l'Observatoire, 25009 Besançon Cedex, France.
authors.forename: Fabrice
authors.initials: F
authors.lastname: Lallemand
authors.affiliation: Institut UTINAM, UMR 6213 CNRS, Université de Franche-Comté, 30 Avenue de l'Observatoire, 25009 Besançon Cedex, France.
authors.forename: Jean-Marie
authors.initials: JM
authors.lastname: Melot
authors.affiliation: Institut FEMTO-ST, UMR 6174 CNRS, Université de Franche-Comté, 26, Chemin de l'Epitaphe, 25030 Besançon Cedex, France.
authors.forename: Xavier
authors.initials: X
authors.lastname: Roizard
authors.affiliation: ICB Laboratory, UMR 6303 CNRS, Université de Bourgogne, 9, Av. Alain Savary, 21078 Dijon Cedex, France.
authors.forename: Olivier
authors.initials: O
authors.lastname: Heintz
authors.affiliation: Institut UTINAM, UMR 6213 CNRS, Université de Franche-Comté, 30 Avenue de l'Observatoire, 25009 Besançon Cedex, France.
authors.forename: Virginie
authors.initials: V
authors.lastname: Moutarlier
authors.affiliation: Institut UTINAM, UMR 6213 CNRS, Université de Franche-Comté, 30 Avenue de l'Observatoire, 25009 Besançon Cedex, France. Electronic address: jean-yves.hihn@univ-fcomte.fr.
authors.forename: Jean-Yves
authors.initials: JY
authors.lastname: Hihn
keywords: Alkylphosphonic acid; Cyclic voltammetry; High frequency ultrasound; Self-assembly; Stainless steel