• Title/Summary/Keyword: 가시광선 촉매

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Anti-Reflection Coating Technology Based High Refractive Index Lens with Ultra-Violet Rays Blocking Function (반사방지 코팅기술 기반 자외선 차단 기능의 고굴절률 안경렌즈)

  • Kim, Ki-Chul
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.17 no.12
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    • pp.482-487
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    • 2016
  • Ultra-violet rays are very harmful to eye health care. The blocking of ultra-violet rays and a reduction of optical reflection in the visible light range, which is to increase the share of transmitted light, and avoid the formation of ghost images in imaging, are important for the applications of polymer eyeglasses lenses. In this study, the high-refractive index polymer lenses, n=1.67, were fabricated by injection-molded method with the xylene diisocyanate monomer, 2,3-bis-1-propanethiol monomer, and benzotriazol UV absorber (SEESORB 709) mixture. To reduce the reflection of the polymer lens surfaces, multi-layer anti-reflection (AR) coatings were coated for both sides of the polymer lens using an E-beam evaporation system. The optical properties of the UV blocking polymer lens were characterized using a UV-visible spectrometer. The material properties of the thin films, which were composed AR coating layers, refractive index, and surface roughness, were analyzed by ellipsometry and atomic force microscopy. As a result, the fabricated polymer lens perfectly blocked ultra-violet rays below 395 nm with a blocking rate greater than 99%.

Synthesis and Photocatalytic Activity of WO3-xFx Photocatalysts Using a Vapor Phase Fluorination (기상 불소화법을 이용한 WO3-xFx 광촉매의 합성 및 광분해 특성)

  • Lee, Hyeryeon;Lim, Chaehun;Lee, Raneun;Lee, Young-Seak
    • Applied Chemistry for Engineering
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    • v.32 no.6
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    • pp.632-639
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    • 2021
  • In this research, fluorine doping was performed to enhance the photocatalytic activities of WO3 which were measured using methylene blue dye. WO3-xFx photocatalyts were prepared by a vaper phase fluorination during a sintering for preparing WO3 photocatalysts from a WCl6 precursor. The bandgap energy of WO3 photocatalysts decreased from 2.95 eV to 2.54 eV, and the oxygen vacancies site increased by about 55% after fluorine doping. In addition, the initial degradation efficiency of methylene blue showed that the fluorine doped sample showed a 6-fold increase in photocatalytic activities from 10% to 60% compared to that of the untreated sample. It is believed that fluorine is doped to reduce the band gap of photocatalysts, enabling the catalytic activity with low energy, and that oxygen vacancies-generated surface defects increase the visible light absorption region of WO3 photocatalysts, thereby increasing photocatalytic activity. In this study, it was confirmed that fluorine-doped WO3-xFx photocatalysts with an excellent photocatalytic activity can be manufactured easily using a one-step vaper phase fluorination that does not require a post-treatment process.