Ultrathin organic films for protection against atmospheric corrosion : A vibrational spectroscopy study
Mardi 7 juin 2016 10:00
- Duree : 1 heure
Lieu : ILL 4, Seminar Room, 71 avenue des Martyrs - Grenoble
Orateur : Magnus JOHNSON (KTH Royal Institute of Technology, SE-100 44, Stockholm, Sweden)
A multianalytical approach has been used to study the ability of ultrathin organic monolayers to protect copper surfaces against atmospheric corrosion. Monolayers of thiols of varying chain length as well as selenols have been used to form self-assembled monolayers (SAMs) acting as corrosion inhibitors on copper surfaces. The use of self-assembled monolayers to protect copper surfaces has advantages such as that objects of any shape can be coated (e.g. microelectronics where traditional coatings are too thick), and that the thickness of the film can be controlled on the Ångström level by changing the chain length.
The samples have been exposed to humid air containing formic acid, thus mimicking a typical indoor atmospheric corrosion process. The combination of techniques has allowed examinations of the nature and kinetics of formation of the corrosion products (infrared spectroscopy), the mass of the corrosion products (quartz crystal microbalance, ng/cm2), the spatial distribution of the corrosion products with a resolution of 20 nm (nano FTIR microscopy), and the status (induced disorder, removal) of the corrosion inhibitor (vibrational sum frequency spectroscopy). Thus, a complete picture of the corrosion process can be obtained, involving both information about the corrosion products formed and the faith of the corrosion inhibitor.
Contact : tellier@ill.fr
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