29 November 2000 Wetability of sol-gel-derived TiO2 films
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Proceedings Volume 4086, Fourth International Conference on Thin Film Physics and Applications; (2000) https://doi.org/10.1117/12.408289
Event: 4th International Conference on Thin Film Physics and Applications, 2000, Shanghai, China
Abstract
TiO2 thin films were deposited on glass substrates by the sol-gel process using spin-coating technique. Three kinds of sol systems were used to produce the films which were then baked at various temperatures. Water contact angles of the films were measured using the tilting plate method. The initial water contact angle of an as-prepared film was < 5 degree(s), and after a certain period of placement it started to increase gradually up to a maximum of 72 degree(s). Water adsorption was found to accelerate the increase of the contact angle. Appropriate UV light irradiation could make the high (72 degree(s)) water contact angle of the film return to the initial value, i.e., < 5 degree(s). Films prepared with DEA-chelated precursors have higher speed of increase in the water contact angle than those prepared with AcAc-chelated precursors or without any chelating agent. AFM images showed that the surface roughness of these films were different, suggesting that the surface roughness is another factor affecting the wettability of the films.
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Jing Chen, Jielin Sun, Lisong Hou, "Wetability of sol-gel-derived TiO2 films", Proc. SPIE 4086, Fourth International Conference on Thin Film Physics and Applications, (29 November 2000); doi: 10.1117/12.408289; https://doi.org/10.1117/12.408289
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