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The effect of nanocrystalline tungsten oxide concentration on surface properties of dip-coated hydrophilic WO3-SiO2 thin films

Naseri, N ; Sharif University of Technology | 2007

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  1. Type of Document: Article
  2. DOI: 10.1088/0022-3727/40/7/034
  3. Publisher: 2007
  4. Abstract:
  5. WO3-SiO2 compound thin films were deposited on glass substrates using the sol-gel method, and then all the samples were dried at 100 °C and annealed at 400 °C in air. The effect of WO3 concentration on the hydrophilicity of WO3-SiO2 compound films was studied for the first time and it was shown that the films containing 85 mol% of the concentration possessed a superhydrophilic surface without UV or visible irradiation. Optical properties of the films such as transmittance, reflectance and bandgap energy were investigated using a UV-visible spectrophotometer. According to atomic force microscopy, the surface ratio was maximized in 85 mol% concentration of WO3 similar to hydrophilicity. Surface chemical states of the films were studied by x-ray photoelectron spectroscopy, which determined the stoichiometry of the deposited thin films. X-ray diffraction patterns showed that the compound thin films constituted of nanocrystalline tungsten oxide grains with 60-10 nm grain size depending on the WO3 concentration. © 2007 IOP Publishing Ltd
  6. Keywords:
  7. Energy gap ; Hydrophilicity ; Nanocrystalline materials ; Rapid thermal annealing ; Sol-gel process ; Surface properties ; Tungsten compounds ; Compound films ; Glass substrates ; Superhydrophilic surfaces ; Tungsten oxides ; Thin films
  8. Source: Journal of Physics D: Applied Physics ; Volume 40, Issue 7 , 2007 , Pages 2089-2095 ; 00223727 (ISSN)
  9. URL: https://iopscience.iop.org/article/10.1088/0022-3727/40/7/034/pdf