title: Organosilicon coatings deposited in atmospheric pressure townsend discharge for gas barrier purpose: effect of substrate temperature on structure and properties.
abstract: Organosilicon plasma polymer and silicalike layers are deposited at different temperatures in a dielectric barrier discharge at atmospheric pressure operating in the Townsend regime. Final properties of these two kinds of layers can be finely tuned by the plasma process conditions. In particular, influence of deposition temperature is investigated when hexamethyldisiloxane based monolayers are deposited on poly(ethylene naphtalate) substrate. Coating chemical structure is tested by means of Fourier transform infrared spectroscopy and X-ray photoelectron spectroscopy. Their thickness, topography, and mechanical properties are evaluated by ellipsometry, scanning electron microscopy observation of coatings cross sections, atomic force microscopy, and nanoscratch testing. Permeability of coated polymer is measured for transparent silicalike layers, and the effect of coating structure on the oxygen gas permeability is discussed. The deposition temperature of coatings at 90 °C provides a strong improvement in barrier property compared to room temperature deposition, thanks to a densification of the SiO₂ matrix and to a decrease in the silanol group content.
authors.affiliation: Advanced Materials & Structures, Centre de Recherche Public Henri Tudor, Rue de Luxembourg 66, L4221 Esch sur Alzette, Luxembourg.
authors.forename: Julien
authors.initials: J
authors.lastname: Petersen
authors.forename: Julien
authors.initials: J
authors.lastname: Bardon
authors.forename: Aziz
authors.initials: A
authors.lastname: Dinia
authors.forename: David
authors.initials: D
authors.lastname: Ruch
authors.forename: Nicolas
authors.initials: N
authors.lastname: Gherardi
mesh_terms: D001274:Atmospheric Pressure; D008422:Materials Testing; D017646:Organosilicon Compounds / Q000737:chemistry*; D058626:Plasma Gases / Q000737:chemistry*; D013696:Temperature
chemical_list: D017646:Organosilicon Compounds; D058626:Plasma Gases