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Sol–gel preparation and characterization of anti-reflective and self-cleaning SiO2–TiO2double-layer nanometric films

Authors
Journal
Solar Energy Materials and Solar Cells
0927-0248
Publisher
Elsevier
Publication Date
Volume
93
Issue
10
Identifiers
DOI: 10.1016/j.solmat.2009.06.022
Keywords
  • Photocatalysis
  • Tio2Coating
  • Sio2/Tio2Coating
  • Anti-Reflective Coating
  • Self-Cleaning Coating

Abstract

Abstract Glass substrates were first coated with SiO 2 and then TiO 2 by dipping into sols which were prepared by two different methods involving complex formation and hydrolysis, using ethanol (EtOH) or butyl glycol (BG). Concentration of TiO 2 in the sols was kept at 0.1 and 0.5 wt%. Prepared coatings were investigated by field-emission scanning electron microscope (FESEM), atomic force microscope (AFM), hazemeter, UV–visible spectrophotometer and goniometer. Rhodamine B (RhB) photodegradation tests were performed in order to evaluate photocatalytic activity. Application of SiO 2 as the bottom layer increased the transmittance by 6% points, thereby compensated for the loss of transmittance caused by the TiO 2 self-cleaning top layer. Pencil-hardness values of the obtained coatings were in 5B–3H range. TiO 2 coatings obtained from sols containing 0.5% TiO 2 and BG solvent represented the highest photocatalytic activity, with a rate constant of 0.44 ppm −1 h −1 and a half period of 5.5 h. Self-cleaning surfaces were obtained while maintaining the anti-reflectance.

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