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Convective Deposition of Silica Nano-Colloidal Particles and Preparation of Anti-Reflective Film by Controlling Refractive Index

콜로이드 실리카 나노입자의 부착에 의한 반사방지막 제조 및 굴절율 조절

  • Hwang Yeon (Department of Materials Science & Engineering, Seoul National University of Technology) ;
  • Prevo Brian (Department of Chemical and Biomolecular Engineering, North Carolina State University) ;
  • Velev Orlin (Department of Chemical and Biomolecular Engineering, North Carolina State University)
  • 황연 (서울산업대학교 신소재공학과) ;
  • ;
  • Published : 2005.05.01

Abstract

Anti-reflection film was coated by using spherical silica nano colloids. Silica colloid sol was reserved between two inclined slide glasses by capillary force, and particles were convectively stacked to form a film onto the substrate as the water evaporates. As the sliding speed increased, the thickness of the film decreased and the wavelength at the maximum transmittance decreased. The microstructure observed by SEM showed that silica particles were nearly close packed, which enabled the calculation of the effective refractive index of the film. The film thickness was measured by proffer and calculated from the wavelength of maximum transmittance and the effective refractive index. The effective refractive index of the film could be controlled by a subtle controlling of the coating speed and by mixing two different sized silica particles. When the 100 nm and 50 m particles were mixed at 4:1-5:1 volume ratio, the maximum transmittance of $95.2\%$ for one-sided coating was obtained. This is the one that has increased by $3.8\%$ compared to bare glass substrate, and shows that $99.0\%$ of transmittance or $1.0\%$ of reflectance can be achieved by the simple process if both sides of the substrate are coated.

Keywords

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