| Summary: | 碩士 === 國立中央大學 === 光電科學與工程學系 === 103 === Sol-gel process is an easy method for fabricating a superhydrophilic hybrid thin film. A two-layer structure, TiO2+SiO2/AR coating/glass and TiO2+SiO2/SiO2/glass, was designed and fabricated.
The transmittance of superhydrophilic hybrid thin film was increased by inserting AR coating or SiO2 film between TiO2+SiO2 and glass. The transmittance of TiO2+SiO2/AR coating/glass and TiO2+SiO2/SiO2/glass was 94.3% and 91.4%, respectively.
The water contact angle (WCA) of the TiO2+SiO2 superhydrophilic hybrid thin film was less than 10° following treatment with ultraviolet irradiation (253.7 nm, 4 mW/cm2). The superhydrophilic hybrid thin film exhibited lasting superhydrophilicity when stored in a dark place (opaque acrylic box). After 76 h of storage in a dark place, the superhydrophilic hybrid thin film exhibited a significantly lower WCA.
To ensure that the durable TiO2+SiO2 superhydrophilic hybrid thin film, its mechanical properties were measured. The hardness of the superhydrophilic hybrid thin film was obtained (≥ 3 H) by performing the pencil hardness test. According to the ISO 2409 standard, the adhesion of a superhydrophilic hybrid thin film causes it to be given a quality rank of 1. The superhydrophilic property was be maintained after the thin film was treated by pressing steel wool under a 500 g weight and moving it parallel to the substrate, back and forth on it more than 1280 times.
The phenomenon of thin film cracking and stripping was not observed under 100 ℃ (168 h) and 85 %RH (100 h).
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