Abstract
TiO2 nanoparticles were synthesized via the hydrothermal method. As-synthesized TiO2 properties were characterized by XRD, EDX, FESEM, FTIR, and UV-Vis spectroscopy. Indicated peaks in XRD patterns confirm formation of TiO2 nanoparticles with the anatase phase. Average crystallite sizes and strain were estimated from the XRD main peaks of all samples through Williamson–Hall method. Optical energy band gap of TiO2 was determined to be about 3.27–3.44 eV, which appeared higher than those of other researches for anatase TiO2 (3.20 eV). Also, increasing temperatures and aging times make the crystallite size increase and the energy band gap decrease. Photocatalytic activity of samples was examined by measuring rate of methylene blue (MB) decomposition. In photocatalytic process, MB was degraded by photocatalytic and adsorption processes. Aging temperature and time were significant in terms of the MB decolorization ability. The optimal synthesis condition of temperature and aging time was obtained at about 130°C and 16 h, respectively. TiO2 nanopowder prepared in the previous step was deposited by the spin-coating method on a glass substrate. Self-cleaning properties of the glass substrate coated with TiO2 nanoparticles were studied by measuring the water contact angle. TiO2 thin films have little photocatalytic activity because of their low area. To overcome this disadvantage, TiO2 porous thin films were deposited on glass substrates using polyethylene glycol (PEG) as a template pore-generating agent. TiO2 thin film with 20 wt % PEG showed better hydrophilic property and a better self-cleaning property. Enhancement of surface wettability due to UV-induced TiO2 hydrophilicity has been evidenced by contact angle measurements.
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The authors would like to thank University of Guilan for financial support.
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Rahmati Ali Abad, M., Shayesteh, S.F. & Shayesteh, H.F. Effect of Synthesis Conditions on the Structural, Photocatalic, and Self-Cleaning Properties of TiO2 Nanoparticles. Phys. Solid State 62, 120–130 (2020). https://doi.org/10.1134/S1063783420010023
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DOI: https://doi.org/10.1134/S1063783420010023