솔-젤 법에 의한 적외선 차단 ATO 박막 제조
Fabrication of ATO thin film for IR-cut off by sol-gel method
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초록
ATO 나노 입자들로 구성된 적외선 차단 박막이 솔-젤 법에 의해 성공적으로 제조되었다. 코팅액은 유무기 하이브리드 바인더와 콜로이드 ATO 용액으로 합성되었고 ATO 박막은 슬라이드 유리기판에 5~40 mm/s의 인상속도로 코팅되었다. 인상속도가 5 mm/s에서 40 mm/s로 증가함에 따라 코팅막의 두께 또한 1.05 μm에서 4.25 μm로 증가하였다. 그리고 파장780 nm에서 2500 nm에서의 적외선 차단율은 49.5 %에서 66.7 %로 증가하였다. 또한 80oC에서 건조된 ATO 박막의 연필경도 값은 5H를 나타내었고 tetraethylorthosilicate와 methyltrimethoxysilane을 합성한 하이브리드 바인더의 영향으로 테이프테스트 후 코팅막은 벗겨지지 않았다. 서로 다른 인상속도에 의해 제조된 박막의 표면구조, 광학적 특성 그리고 박막두께는FE-SEM, UV-Vis-NIR 분광기 그리고 Dektak에 의해 측정되었다.
Abstract
IR cut-off thin films consisted of ATO nanoparticles were successfully fabricated by sol-gel method. The coating solution was synthesized with organic/inorganic hybrid binder and ATO colloidal solution and ATO thin films were coated on a slide glass with the withdrawal speed of 5~40 mm/s. As the withdrawal speed increased from 5 mm/s to 40 mm/s, the thickness of coating thin films also increased from 1.05 μm to 4.25 μm and the IR cut-off in wavelength of 780~2500 nm increased from 49.5 % to 66.7 %. In addition, the pencil hardness of ATO thin films dried at 80oC was ca. 5H and the coating films were not removed after a cross cutter tape test because of the hybrid binder synthesized with tetraethylorthosilicate and methyltrimethoxysilane. The surface morphologies, optical properties and film thickness of prepared thin films with a different withdrawal speed were measured by field emission scanning electron microscope (FESEM),UV-Vis spectrophotometer, and Dektak.
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