4.6 Article

Thermoinduced and Photoinduced Sustainable Hydrophilic Surface of Sputtered-TiO2 Thin Film

期刊

COATINGS
卷 11, 期 11, 页码 -

出版社

MDPI
DOI: 10.3390/coatings11111360

关键词

TiO2; hydrophilicity; thermoinduced; photoinduced; thin film

资金

  1. Korea Institute of Energy Technology Evaluation and Planning (KETEP)
  2. Ministry of Trade, Industry, and Energy (MOTIE) of the Republic of Korea [20194030202290]
  3. Basic Science Research Capacity Enhancement Project through Korea Basic Science Institute (National research Facilities and Equipment Center)
  4. Ministry of Education [2019R1A6C1010016]

向作者/读者索取更多资源

In this research, hydrophilic surfaces of TiO2 thin film were successfully obtained through thermoinduced and photoinduced methods to reduce the water contact angle, and it was found that crystallinity influences the hydrophilicity and sustainability of the films under sunlight.
To achieve self-cleaning at a low maintenance cost, we investigated the possibility of obtaining a sustainable hydrophilic surface of TiO2 thin film. As the hydrophilicity of TiO2 films fabricated by FTS has not yet been studied, we deposited TiOx using FTS, and then TiO2 was formed through additional treatment. Hydrophilic surfaces were obtained by thermoinduced and photoinduced methods. UV irradiation led to the conversion of Ti4+ to Ti3+ in the lattice structure and an increase in the number of OH groups on the surface, and annealing induced the formation of Ti3+ defect sites, as well as organic degradation and changes in the crystal structure. Through the annealing process, the water contact angle of as-deposited film was decreased from 78.7 & DEG; to 35.7 & DEG;, and crystallinity changed from amorphous to anatase. These changes contributed to the formation of a hydrophilic surface and reduced the water contact angle by up to 10.8 & DEG;. After the formation of a hydrophilic surface through annealing and UV irradiation, the sample returned to its original state. We confirmed that the water contact angle of the returned sample was decreased through exposure to sunlight; it reduced the water contact angle of the returned sample by 15.2 & DEG;. Thus, the results revealed that the crystallinity influences the hydrophilicity and its sustainability for TiO2 films under sunlight.

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