Anodized transparent titanium dioxide sensitized with curcumin dye from turmeric powder and its application for copper ion detection in water

Abstract

Transparent titanium dioxide on glass substrate was fabricated by employing electrochemical anodization process in 0.8wt% ammonium fluoride in 2% water/ethylene glycol solution at 50 V for 5 minutes and annealing it at 450°C. Based from the Raman spectra of the sample, the dominant phase of the fabricated TiO2 was anatase. The grown TiO2 was sensitized with curcumin, a natural dye extracted from commercial, non-toxic turmeric powder. UV-Vis spectroscopy analysis was performed and the response of the sensitized TiO2 when exposed to ~1 ppm and ~100 ppm copper ion solutions showed significant and reasonable changes or shifts in the transmittance curves.