Influence of Fe3+ ions on the optical properties and photocatalytic ability of spin coated Fe3+ doped brookite TiO2 thin films

Komaraiah, Durgam; Radha, Eppa; Sivakumar, J.; Sayanna, R.

doi:10.1088/2631-6331/ac5d27

Cited by 2 publications

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“…Optical absorption was found to be more for the C3 sample. The bandgaps of the films were evaluated using Tauc plots [19,20] and are shown in figure 4(b). The band energy values were found from the plots of (αhυ) 2 versus (hυ).…”

Section: Resultsmentioning

confidence: 99%

“…Photocatalytic activity (PCA) of CuO films was estimated by PD of MB and MO dye in aqueous solutions of concentration 5 mg l −1 and 10 mg l −1 (30 ml) under visible light irradiation. The experiments were accomplished according to the description given in our earlier reports [14,19,20]. The time-dependent photodegradation experiments were done by keeping a constant distance of 30 cm between the surface of the dye solution to the light source.…”

Section: Resultsmentioning

confidence: 99%

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Structural, optical properties and photocatalytic activity of spin-coated CuO thin films

Komaraiah¹,

Sayanna²

2023

Adv. Nat. Sci: Nanosci. Nanotechnol.

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The semiconductor metal oxide CuO films have been fabricated using spin coating techniques. The prepared CuO thin films were annealed at different temperatures and characterized by an x-ray diffractometer, scanning electron microscope (SEM), energy-dispersive x-ray spectroscopy (EDS), FTIR, UV–vis, and fluorescence spectrometer. X-Ray diffraction (XRD) patterns revealed the polycrystalline nature of CuO with the monoclinic crystal structure. SEM analysis of CuO films endorsed the particle-like spherical shape structure. The CuO thin films have shown high optical absorption with a narrow bandgap. The band gap values were evaluated from Tauc’s plots and these values were found to be in the range of 1.63 to 1.72 eV. At an excitation of 325 nm, the CuO films display characteristic photoluminescence (PL) emission in the UV and visible regions. Furthermore, the CuO thin films show enhanced photocatalytic performance towards the degradation of organic dyes under visible light.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Structural, optical properties and photocatalytic activity of spin-coated CuO thin films

Komaraiah¹,

Sayanna²

2023

Adv. Nat. Sci: Nanosci. Nanotechnol.

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Undoped and Fe-Doped Anatase/Brookite TiO2 Mixed Phases, Obtained by a Simple Template-Free Synthesis Method: Physico-Chemical Characterization and Photocatalytic Activity towards Simazine Degradation

et al. 2023

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For the first time, Fe-doping (0.05, 1.0, and 2.5 wt.% Fe) was performed on a high-surface-area anatase/brookite TiO2 by adopting a simple template-free sol-gel synthesis followed by calcination at a mild temperature. The powders’ textural and surface properties were characterized by following a multi-technique approach. XRD analysis showed that the anatase/brookite ratio slightly varied in the Fe-doped TiO2 (from 76.9/23.1 to 79.3/22.7); Fe doping noticeably affected the cell volume of the brookite phase, which decreased, likely due to Fe3+ ions occupying interstitial positions, and retarded the crystallite growth. N2 sorption at −196 °C showed the occurrence of samples with disordered interparticle mesopores, with an increase in the specific surface area from 236 m2 g−1 (undoped TiO2) to 263 m2 g−1 (2.5 wt.% Fe). Diffuse Reflectance UV-Vis spectroscopy showed a progressive decrease in the bandgap energy from 3.10 eV (undoped TiO2) to 2.85 eV (2.5 wt.% Fe). XPS analysis showed the presence of some surface Fe species only at 2.5 wt.% Fe, and accordingly, the ζ-potential measurements showed small changes in the pH at the isoelectric point. The photocatalytic degradation of simazine (a persistent water contaminant) both under UV and simulated solar light was performed as a probe reaction. Under UV light, Fe-doping improved simazine degradation in the sample at 0.05 wt.% Fe, capable of degrading ca. 77% simazine. Interestingly, the undoped TiO2 was also active both under UV and 1 SUN. This is likely due to the occurrence of anatase/brookite heterojunctions, which help stabilize the photogenerated electrons/holes.

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Influence of Fe³⁺ ions on the optical properties and photocatalytic ability of spin coated Fe³⁺ doped brookite TiO₂ thin films

Cited by 2 publications

References 48 publications

Structural, optical properties and photocatalytic activity of spin-coated CuO thin films

Structural, optical properties and photocatalytic activity of spin-coated CuO thin films

Undoped and Fe-Doped Anatase/Brookite TiO2 Mixed Phases, Obtained by a Simple Template-Free Synthesis Method: Physico-Chemical Characterization and Photocatalytic Activity towards Simazine Degradation

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