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<p>The superhydrophilic and photocatalytic properties of titanium dioxide (TiO<sub>2</sub>) thin films, PEG-TiO<sub>2</sub>&#xa0;and PVA-TiO<sub>2</sub>&#xa0;composite thin films synthesized by the sol–gel method were investigated. Starting TiO<sub>2</sub>&#xa0;solutions were prepared with and without the addition of polyethylene glycol (PEG) and polyvinyl alcohol (PVA) on a glass substrate&#xa0;with the spin coating method under the same deposition conditions. The effects of the PEG concentration on the properties of the films were studied. We observed that the TiO<sub>2</sub> film with an anatase structure exhibited superhydrophilic characteristics, with a contact angle of 7° and photocatalytic activity. The contact angle values for all the samples were compared with and without the additive polymer. The PEG-TiO<sub>2</sub>&#xa0;sample has the lowest contact angle, which was 1°. The UV‒VIS transmittance spectra of TiO<sub>2</sub>, PVA-TiO<sub>2</sub> and&#xa0;PEG-TiO<sub>2</sub>&#xa0;present a maximal transmittance higher than 80%, indicating good transparency and a typical strong absorption band at ~ 388&#xa0;nm. The thicknesses of TiO<sub>2</sub> and PEG60-TiO<sub>2</sub> are approximately 172 and 267&#xa0;nm (± 5&#xa0;nm), respectively. PEG-TiO<sub>2</sub> achieved 83% methylene blue degradation in 40&#xa0;min, compared to 72% in 60&#xa0;min for pure TiO<sub>2</sub>.</p>

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Synthesis and characterization of superhydrophilic PVA-TiO2 and PEG-TiO2 composite thin films via the sol–gel method and ınvestigation of PEG-TiO2 photocatalytic characteristics

  • 期刊论文

  • 发表日期：

    2026年8月5日

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  • Zahra Samadi,
  • Kamuran Kara Koç,
  • Fahrettin Sarcan,
  • Ayşe Erol

摘要

The superhydrophilic and photocatalytic properties of titanium dioxide (TiO2) thin films, PEG-TiO2 and PVA-TiO2 composite thin films synthesized by the sol–gel method were investigated. Starting TiO2 solutions were prepared with and without the addition of polyethylene glycol (PEG) and polyvinyl alcohol (PVA) on a glass substrate with the spin coating method under the same deposition conditions. The effects of the PEG concentration on the properties of the films were studied. We observed that the TiO2 film with an anatase structure exhibited superhydrophilic characteristics, with a contact angle of 7° and photocatalytic activity. The contact angle values for all the samples were compared with and without the additive polymer. The PEG-TiO2 sample has the lowest contact angle, which was 1°. The UV‒VIS transmittance spectra of TiO2, PVA-TiO2 and PEG-TiO2 present a maximal transmittance higher than 80%, indicating good transparency and a typical strong absorption band at ~ 388 nm. The thicknesses of TiO2 and PEG60-TiO2 are approximately 172 and 267 nm (± 5 nm), respectively. PEG-TiO2 achieved 83% methylene blue degradation in 40 min, compared to 72% in 60 min for pure TiO2.