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An Investigation on Photocatalytic Behavior of N-doped and N-V-doped TiO2 Thin Film, Coated on Glass Surface by Sol-gel Dip Coating Method

Khatibnezhad, Hediyeh | 2013

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 44890 (07)
  4. University: Sharif University of Technology
  5. Department: Materials Science and Engineering
  6. Advisor(s): Faghihi Sani, Mohammad Ali
  7. Abstract:
  8. In this study, the photocatalytic activity and hydrophilicity of coat improved using Nitrogen and Vanadium elements as dopant in TiO2 coating. By using vanadium and nitrogen elements and silica prelayer, a titania coating was deposited on the soda-lime glass substrate by sol-gel dip coating method to produce self-cleaning surface. XRD and FTIR analyses were done on the powders after heat treating at in 450˚C for 30 min. XPS analysis was done for investigation of N replacement in titania structure. The band-gap energy of formed anatase was derived using UV-Vis analysis. The coating morphology and thickness were also investigated by SEM. Hydrophilicity of coatings was determined by measuring contact angle of water drop with surface. The photocatalytic activity of vanadium doped titania coatings was evaluated by measuring degradation rate of aqueous methyl orange (MO) as well as stearic acid and PVA under UV irradiation. According to XRD results, it was obvious that 100% anatase phase was formed in the doped samples by Nitrogen and Nitrogen-Vanadium. Nitrogen had an important role in decrease of band-gap energy due to its interstitial replacement in titania structure. The N-V-TiO2 sample improved hydrophilicity and photocatalytic activity of the titania coating owing to decrease in both band-gap energy from 3.48 eV to 2.93 eV and charge recombination of electron-hole
  9. Keywords:
  10. Dipping ; Titania Coating ; Photocatalyst ; Nitrogen ; Vanadium ; Sol-Gel Method

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