Surface and photocatalytic properties of ZnO thin film prepared by sol-gel method |
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Authors: | Patcharee Jongnavakit Pongsaton Amornpitoksuk Sumetha Suwanboon Tanakorn Ratana |
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Affiliation: | a Department of Chemistry and Center for Innovation in Chemistry, Faculty of Science, Prince of Songkla University, Hat-Yai, Songkhla 90112, Thailandb Department of Materials Science and Technology, Faculty of Science, Prince of Songkla University, Hat-Yai, Songkhla 90112, Thailandc Industrial Chemistry Department, Faculty of Science, King Mongkut's University of Technology North Bangkok, Bangkok, 10800, Thailand |
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Abstract: | ZnO films were prepared on glass substrates by a sol-gel dip-coating technique. The films showed a polycrystalline phase without any preferable orientation. By decreasing the withdrawal speed, the surface of the ZnO films became denser because of a decrease in particle sizes. This reduces the distance between the supported solids under the water droplet that could increase the degree of the pinning effects, and leads to increase the water contact angle. Furthermore, these prepared ZnO films showed photocatalytic properties indicating by photocatalytic degradation of methylene blue under a blacklight illumination. By increasing the calcination temperature, the water contact angle value decreases due to the grain coalescence which increases the gap between these supported solids. On the other hand, this enhances the photocatalytic activity caused by the improving of the crystallinity and the surface roughness of ZnO thin films with an increase in calcination temperature. |
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Keywords: | ZnO thin films Dip-coating Sol-gel Photocatalyst |
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