Sol-gel 법에 의해 SnO2계 박막 위에 코팅된 TiO2 박막의 특성
Properties of TiO2 thin film coated on SnO2 thin films by sol-gel method
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초록
Sol-gel법에 의해 친수성 투명 TiO2 박막이 제조되었고, 박막의 접촉각, 표면구조, 투과율의 특성이 측정되었다. 더욱이 박막의 친수 특성을 향상시키기 위하여 계면활성제 tween 80이 이용되었다. Tween 80의 첨가량이 0, 10, 30, 50 wt% 일 때, 제조된 박막의 접촉각은 각각 41.4 o , 18.2 o , 16.0 o , 13.2 o로 확인되었다. 제조된 TiO2 박막은 자외선 조사 후 Methylene blue용액을 분해시켜 흡광도를 감소시키는 광촉매 특성을 보여주었다. 일반유리(bare glass), Antimony Tin Oxide(ATO) 코팅 유리, Fluorine Tin Oxide(FTO) 코팅유리, Indium Tin Oxide(ITO) 코팅유리 기판 위에 Tween 80을 30 wt% 함유한 TiO2 용액 을 적층하여 박막의 접촉각과 투과율을 측정하였다. 다양한 기판에 제조된 박막은 16.2~27.1 o의 표면 접촉각을 나타냈으며 자외선 조사 후에는 접촉각이 13.2~17.6 o로 낮아졌다. 특히 ATO코팅유리와 FTO 코팅유리 기판 위에 코팅된 필름은 가시광 선 영역에서 각각 74.6 %, 76.8 %의 높은 투과율을 나타내었고, 적외선 영역에서는 각각 54.2 %, 40.4 %의 낮은 투과율을 나타냈다.
Abstract
Hydrophilic and transparent TiO2 thin film was fabricated by sol-gel method and the properties of contact angle, surface morphology, and transmittance were measured. In addition, surfactant Tween 80 was used for increasing the hydrophilic property of thin film. When the contents of Tween 80 in TiO2 solution was 0, 10, 30, 50 wt%, the contact angles of TiO2 thin film were 41.4 o , 18.2 o , 16.0 o , 13.2 o , respectively. Fabricated TiO2 thin film showed the photocatalytic property that decomposed methylene blue and decreased the absorbance of solution after UV irradiation. TiO2 thin films fabricated with the solution of 30 wt% Tween 80 were deposited on glass (bare), antimony tin oxide (ATO), fluorine tin oxide (FTO), indium tin oxide (ITO) coated glass substrates, and the contact angle and transmittance of thin film was measured. The contact angles of thin films deposited on four substrates were 16.2~27.1 o and was decreased to the range of 13.2~17.6 o after UV irradiation. Especially, the thin films coated on ATO and FTO glass substrate showed high transmittance of 74.6 % and 76.8 % in visible range, respectively, and low transmittance of 54.2 % and 40.4 % in infrared range, respectively.
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