title: 1-Dodecanethiol self-assembled monolayers on cobalt.
abstract: Cobalt and its alloys are used in a broad range of application fields. However, the use of this metal is especially limited by its strongly oxidizable nature. The use of alkanethiol self-assembled monolayers (SAMs) is a very efficient way to protect against such oxidation and/or to inhibit corrosion. This surface modification method has been particularly applied to oxidizable metals such as copper or nickel, yet the modification of cobalt surfaces by alkanethiol SAMs received limited attention up to now. In this work, we study the influence of parameters by which to control the self-assembly process of 1-dodecanethiol monolayers on cobalt: nature of the surface pretreatment, solvent, immersion time, and concentration. Each of these parameters has been optimized to obtain a densely packed and stable monolayer able to efficiently prevent the reoxidation of the modified cobalt substrates. The obtained monolayers were characterized by X-ray photoelectron spectroscopy (XPS), polarization modulation infrared reflection-absorption spectroscopy, and contact angle measurements. The stability of the optimized 1-dodecanethiol monolayer upon air exposure for 28 days has been confirmed by XPS.
authors: Laboratory of Chemistry and Electrochemistry of Surfaces (CES), University of Namur (FUNDP), 61 rue de Bruxelles, B-5000 Namur, Belgium.
authors: Sébastien
authors: S
authors: Devillers
authors: Alexandre
authors: A
authors: Hennart
authors: Joseph
authors: J
authors: Delhalle
authors: Zineb
authors: Z
authors: Mekhalif
mesh_terms: D000042:Absorption; D002627:Chemistry, Physical; D003035:Cobalt / Q000737:chemistry*; D010084:Oxidation-Reduction; D010100:Oxygen / Q000737:chemistry*; D056951:Photoelectron Spectroscopy; D012997:Solvents / Q000737:chemistry; D013055:Spectrophotometry, Infrared; D013438:Sulfhydryl Compounds / Q000737:chemistry*; D013499:Surface Properties
chemical_list: D012997:Solvents; D013438:Sulfhydryl Compounds; C013976:dodecylmercaptan; D003035:Cobalt; D010100:Oxygen