title: Dual Precursor Atmospheric Plasma Deposition of Transparent Bilayer Protective Coatings on Plastics.
abstract: We demonstrate a dual organic and inorganic precursor method to deposit transparent organosilicate protective bilayer coatings on poly methyl methacrylate (PMMA) substrates with atmospheric plasma deposition in ambient air. The bottom layer was a hybrid organosilicate adhesive layer deposited with dual organic 1,5-cyclooctadiene (CYC) and widely used inorganic tetraethoxysiline (TEOS) precursors. The selection of the organic CYC precursor allowed incorporation of a carbon chain in the organosilicate adhesive layer, which resulted in improved adhesion. The top layer was a dense silica coating with high Young's modulus and hardness deposited with TEOS. The deposited bilayer structure showed ∼100% transparency in the visible light wavelength region, twice the adhesion energy, and five times the Young's modulus of commercial polysiloxane sol-gel coatings.
authors.affiliation: Department of Materials Science and Engineering, Stanford University, Stanford, California 94305-2205, United States.
authors.forename: Siming
authors.initials: S
authors.lastname: Dong
authors.affiliation: Department of Materials Science and Engineering, Stanford University, Stanford, California 94305-2205, United States.
authors.forename: Zhenlin
authors.initials: Z
authors.lastname: Zhao
authors.affiliation: Department of Materials Science and Engineering, Stanford University, Stanford, California 94305-2205, United States.
authors.forename: Reinhold H
authors.initials: RH
authors.lastname: Dauskardt
keywords: adhesion; atmospheric plasma; dual precursor method; organosilicate coatings; transparent multifunctional coatings