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Study on Optical Characteristics of Nano Hollow Silica with TiO2 Shell Formation

  • Roh, Gi-Yeon (Department of Convergence IT Device and Material Engineering, Korea Polytechnic University) ;
  • Sung, Hyeong-Seok (Department of Convergence IT Device and Material Engineering, Korea Polytechnic University) ;
  • Lee, Yeong-Cheol (Department of Convergence IT Device and Material Engineering, Korea Polytechnic University) ;
  • Lee, Seong-Eui (Department of Convergence IT Device and Material Engineering, Korea Polytechnic University)
  • Received : 2018.11.08
  • Accepted : 2019.01.09
  • Published : 2019.01.31

Abstract

Optical filters to control light wavelength of displays or cameras are fabricated by multi-layer stacking process of low and high index thin films. The process of multi-layer stacking of thin films has received much attention as an optimal process for effective manufacturing in the optical filter industry. However, multi-layer processing has disadvantages of complicated thin film process, and difficulty of precise control of film morphology and material selection, all of which are critical for transmittance and coloring effect on filters. In this study, the composite $TiO_2$, which can be used to control of UV absorption, coated on nano hollow silica sol, was synthesized as a coating material for optical filters. Furthermore, systematic analysis of the process parameters during the chemical reaction, and of the structural properties of the coating solutions was performed using SEM, TEM, XRD and photo spectrometry. From the structural analysis, we found that the 85 nm nano hollow silica with 2.5 nm $TiO_2$ shell formation was successfully synthesized at proper pH control and titanium butoxide content. Photo luminescence characteristics, excited by UV irradiation, show that stable absorption of 350 nm-light, correlated with a 3.54 eV band gap, existed for the $TiO_2$ shell-nano hollow silica reacted with 8.8 mole titanium butoxide solution. Transmittance observed on substrate of the $TiO_2$ shell-nano hollow silica showed effective absorption of 200-300 nm UV light without deterioration of visible light transparency.

Keywords

Nano hollow silica-titanium dioxide;Sol-gel method;Optical characteristics

Acknowledgement

Supported by : National Research Foundation of Korea (NRF)

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