Efect of time and voltage on the morphology of TiO2 flms produced by anodization

Yılmaz O., Ebeoğlugil M. F., Dikici T., Dalmış R.

JOURNAL OF THE AUSTRALIAN CERAMIC SOCIETY, vol.60, pp.1-14, 2024 (SCI-Expanded)

  • Publication Type: Article / Article
  • Volume: 60
  • Publication Date: 2024
  • Doi Number: 10.1007/s41779-024-01033-7
  • Journal Name: JOURNAL OF THE AUSTRALIAN CERAMIC SOCIETY
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Aerospace Database, Communication Abstracts, Metadex, Civil Engineering Abstracts
  • Page Numbers: pp.1-14
  • Dokuz Eylül University Affiliated: Yes

Abstract

This study investigates the infuence of various anodic oxidation parameters on the photocatalytic activities of the nanostructured titanium dioxide (TiO2) flms. TiO2 flms were prepared by anodic oxidation of titanium substrate using 1 M Na2SO4 / 5 wt. % NH4F electrolyte, and then annealed at 500 °C. Anatase appears in all calcined samples. The anodic oxidation process was performed in two steps at diferent voltages (5–80 V) and times (15–480 min) to reveal the relationship between the surface morphologies, wettability and photocatalytic properties. The results showed that the voltage and anodization time can play important role in the surface morphology of nanostructured TiO2 flms and thus in various properties. While 40 V showed the most efcient photocatalytic degradation among voltage values, 60 min was the most efcient time for photocatalytic degradation efciency and lowest contact angle. In addition, a pore area fraction of 39.54%, equal diameter of 96.81 nm, and circularity of 66.7% were obtained from image analysis of the 60-min anodized sample. While increasing the voltage and time benefted up to a point in terms of photocatalytic efciency, changes in morphology had a negative efect after a point. At low voltage and time values, small pore diameters result in low photocatalytic properties. This titania can be readily utilize to meet application expectations in areas such as gas sensors, photocatalysis and photovoltaic cells.