The PET and glass plates coated with TiO2-xNx thin films have obvious approach in hydrophilicity under UV and visible light irradiation. UV-VIS absorbance spectroscopy of PET and glass coated with TiO2-xNx thin films appear a significant shift of the absorption edge to a lower energy in the visible-light region.
Absorbance of TiO2-xNx thin films is better with increasing thickness, and there are peaks of absorbance in the visible region. The peak intensity of absorbance on glass substrate are wider and larger than that on PET substrate in UV-light region.
Therefore, the water contact angles on glass substrates are smaller than those on PET substrates upon UV-light illumination. The peak intensity of absorbance on glass substrate are narrower and smaller than that on PET substrate in VIS-light region.
Therefore, the water contact angles on glass substrates are bigger than those on PET substrates upon VIS-light illumination. The amounts of nitrogen doping on TiO2-xNx
thin film appear direct proportion of influences on photo-generated hydrophilicity of thin films. The optical energy band gaps of TiO2-xNx thin films narrow with increasing nitrogen. The mid-gap level energy band gaps of TiO2-xNx thin films can be near 2.0eV. The photo-induced surface wettability conversion reaction of the thin films was investigated by water contact angle measurement. PET and glass plates coated with TiO2-xNx thin films were found to exhibit a low water contact angle than without coated membranes when the surfaces were illuminated with UV and visible light in the air. The TiO2-xNx thin film on the PET substrate upon UV-VIS light illumination exhibits lowest water contact angle near 8o and 35o, respectively.
Because of roughness and intensity of absorbance, water contact angles of glass plates coated with TiO2-xNx thin films are smaller than water contact angles of PET plates coated with TiO2-xNx thin films. The surface of PET and glass are expected to
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be smooth. Roughness and the photo-induced surface wettability conversion reaction of the thin films affect the degrees of water contact angles.
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簡歷
姓名：余松蒔 性別：男
生日：72﹒06﹒15 出生地：桃園 籍貫：台灣桃園 學歷：國立武陵高中
國立彰化師範大學電機工程系 國立交通大學電子研究所 論文題目：
以濺鍍法製備氮摻雜二氧化鈦薄膜物性及光學特性之研究 Physical and Optical Characteristics of Sputtered Deposited
TiO2-xNx Thin Films
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