SiO<SUB>2</SUB>-Coating of Polystyrene Particles by Sol-Gel Process
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概要
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Polystyrene particles with an average diameter of 15gm were uniformly coated with a SiO<SUB>2</SUB> thin film. Prior to the coating, the surface of polystyrene was activated by oxygen-microwaveplasma treatment. After the particles were dispersed into an ethanol solution of tetraethoxysilane with a small amount of NH<SUB>3</SUB> water as a base catalyst, a 3 hoars' stirring at room temperatu re accomplished the sol-gel SiO<SUB>2</SUB> coating. XPS spectra of the particles treated with oxygen-microwave plasma indicated the introduction of polar groups such as hydroxyl and carboxyl ones on the surface. In diffuse reflectance FT-IR spectra of the particle finally obtained, two absorption peaks assigned to Si-O-Si and Si-OH stretching vibrations were observed at 1100 and 950cm<SUP>-1</SUP>, respectively. EPMA and TEM analyses of the cross section of the particle clearly demonstrated that the polystyrene particles with oxygen-plasma pretreatment were homogeneously covered with a SiO<SUB>2</SUB> film having a thickness of ca. 120 nm, while the particles without pretreatment were heterogeneously covered with SiO<SUB>2</SUB> particles.
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