4.6 Article

Tuning Hydrophobicity of TiO2 Layers with Silanization and Self-Assembled Nanopatterning

期刊

LANGMUIR
卷 29, 期 9, 页码 3054-3060

出版社

AMER CHEMICAL SOC
DOI: 10.1021/la304478s

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资金

  1. WCU (World Class University) program [31-2008-000-10055-0]
  2. National Research Foundation [2012R1A2A1A01009249]
  3. Research Center Program of IBS (Institute for Basic Science) of Republic of Korea [CA1201]
  4. Ministry of Science, ICT & Future Planning, Republic of Korea [IBS CA1301, N01130013] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
  5. National Research Council of Science & Technology (NST), Republic of Korea [2E23941] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
  6. National Research Foundation of Korea [R31-2012-000-10055-0, 2012R1A2A1A01009249] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)

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The wettability of TiO2 layers is controlled by forming highly ordered arrays of nanocones using nanopatterning, based on self-assembly and dry etching. Nanopatterning of TiO2 layers is achieved via formation of self-assembled monolayers of SiO2 spheres fabricated using the Langmuir-Blodgett technique, followed by dry etching. Three I types of TiO2 layers were fabricated using the sol-gel technique, sputtering, and thermal process in order to address the relationship between the wettability and the structure of TiO2 nanostructures. Compared to a thin film TiO2 layer, the nanopatterned TiO2 samples show a smaller static water contact angle (i.e., where the water contact angle etching time increases), which is attributed to the Wenzel equation. When TiO2 layers are coated by 1H,1H,2H,2H-perfluorooctyltrichlorosilane, we observed the opposite behavior, exhibiting superhydrophobicity (up to contact angle of 155) on the nanopatterned TiO2 layers. Self-assembled nanopatterning of the TiO2 layer may provide an advanced method for producing multifunctional transparent layers with self-cleaning properties.

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