Abstract
TiO2 nanoparticles were prepared via sol-gel technique and then doped with cobalt ions to form TiO2 doped cobalt sol. Thin films were prepared from this sol using dip coating method and underwent calcination at a temperature of 550 C.The films were characterized by UV–Vis spectroscopy, X-ray diffraction (XRD), and atomic force microscopy (AFM). The UV–Vis. Absorption spectra show a redshift, which indicates that TiO2 doped cobalt will respond to the visible region of the spectrum rather than UV- region for pure TiO2.
Highlights
Titanium dioxide (TiO2) is one of the most interesting n-type semiconductor materials due to its wide applications such as self- cleaning surfaces, antifogging function, antibacterial function, and decomposition of pollutants [1,2].TiO2 has two main drawbacks it has a photocatalytic activity under UV-light irradiation only since its energy gap is wide (3.2 eV) for anatase phase, (λ= 387nm), and UV forms less than 5% of solar spectrum while the dominant spectral region of solar spectrum is visible.Another drawback is the fast electron–hole recombination
We notice that the crystal size increases with the increasing the concentration of cobalt, and this due to that the radius of cobalt ion Co2+, (0.74 A ), which is greater than that of Ti4+ ion (0.6 A ), so it will be on the surface of Ti4+ ion [6]
3.3 atomic force microscopy (AFM): Figure (3) shows the AFM image of the optimum sample, (0.2 gm cobalt doped TiO2)and thin film annealed at 550°C
Summary
Titanium dioxide (TiO2) is one of the most interesting n-type semiconductor materials due to its wide applications such as self- cleaning surfaces, antifogging function, antibacterial function, and decomposition of pollutants [1,2]. TiO2 has two main drawbacks it has a photocatalytic activity under UV-light irradiation only since its energy gap is wide (3.2 eV) for anatase phase, (λ= 387nm), and UV forms less than 5% of solar spectrum while the dominant spectral region of solar spectrum is visible. Another drawback is the fast electron–hole recombination. Cobalt doped TiO2 sol was achieved by sol gel technique, and thin films of this sol were prepared using dip coating method. Journal of University of Babylon for Pure and Applied Sciences (JUBAS) by University of Babylon is licened under a Creative
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