Comparison of optical and structural properties of Cu doped and Cu/Zr co-doped TiO2 nanopowders calcined at various temperatures

Ilkhechi, Nasrollah Najibi; Kaleji, Behzad Koozegar; Salahi, E.; Hosseinabadi, Navid

doi:10.1007/s10971-015-3661-0

Cited by 36 publications

(9 citation statements)

References 41 publications

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“…Photoluminescence is sensitive to structure, chemical composition and defects is an important property to study in ZrO 2 . The photocatalytic activity of ZrO 2 and other metal oxide semiconductor have been well studied [14][15][16][17]. Ilkhechi and group have reported the effect of calcination temperature on optical properties of various metal doped TiO 2 and ZrO 2 nanopowders [7,17].…”

Section: Introductionmentioning

confidence: 99%

Structural and optical properties of zirconium oxide (ZrO₂) nanoparticles: effect of calcination temperature

Horti¹,

Kamatagi²,

Nataraj³

et al. 2020

Nano Ex.

126

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In this article, we report the structural and optical properties of zirconium oxide (ZrO 2 ) nanoparticles synthesized via chemical co-precipitation method. The effect of calcination temperature on structural and optical properties of ZrO 2 nanoparticles is investigated through XRD, FESEM, EDX, FTIR, UV-Vis absorption, fluorescence emission and life time measurements. XRD spectrum reveals the tetragonal phase at calcination temperature 600°C and crystallinity of samples increases with calcination temperature. At 800°C the phase transition from tetragonal to tetragonal-monoclinic mixed phase is noticed. The FESEM images show the particles are of irregular shape and highly agglomerated. FTIR spectra also confirm the formation of ZrO 2 in crystalline phase. From UV-vis absorption spectra it is found a strong quantization and varying band gap with calcination temperature. The change in emission wavelength and intensity with phase change is observed form fluorescence emission spectra. At higher calcination temperature emission intensity is decreased which may be due to the phase change and the formation of surface defects. The life time measurements also reveal the different trap states and life time with calcination temperature.

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Section: Introductionmentioning

confidence: 99%

Structural and optical properties of zirconium oxide (ZrO₂) nanoparticles: effect of calcination temperature

Horti¹,

Kamatagi²,

Nataraj³

et al. 2020

Nano Ex.

126

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“…This clearly shows the Cudoping inside the TiO2 lattice. 25 . The abscissa of the EDS spectrum indicates the ionization energy and ordinate indicates the counts.…”

Section: ) Energy Dispersive X-ray Spectroscopymentioning

confidence: 99%

Green and Rapid Synthesis of Copper-Doped TiO2 Nanoparticles with Increased Photocatalytic Activity

Raorane¹,

Chavan²,

Pednekar³

et al. 2017

Advances in Chemical Science

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Nano-sized TiO2 photocatalytic water-splitting technology has great potential for low-cost, environmental friendly solarhydrogen production to support the future hydrogen economy. One of the main drawbacks of using TiO2 as a photocatalyst is its band gap of around 3.2 eV for the anatase phase in the near-UV range of the electromagnetic spectrum that uses only small fraction of the solar spectrum. In this study, we have developed an eco-friendly process to synthesize copper doped TiO2 nanoparticles in greener and rapid way that decreases the band gap up to ~2.17-2.50 eV and shifts the absorption to readily available visible range of solar spectrum. Current work is devoted towards the synthesis of copper doped TiO2 nanoparticles in anatase phase in a reliable way by using fruit peel extract of Annona squamosa which is otherwise an agricultural waste by microwave assisted method as a source of energy. This method reduces time, saves chemicals and energy. Doping of copper (Cu) metal efficiently lessens the band gap of TiO2 for the photo-excitation (red shift) and simultaneously reduces the recombination rate of photo generated electron-hole pairs. Characterization studies of green synthesized Cu-doped nano-sized TiO2 particles show significant enhancement in photocatalytic activity that can be potentially applied for hydrogen production than that of pure ones. Use of plant extract and microwave method together makes the synthesis protocol reliable, green and rapid.

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“…Metal ions, such as Zr, Cr, and W, are reported to inhibit the anatase-to-rutile phase transformation. , Transition metals, such as Cu, and rare-earth metals, such as La, lead to the lattice deformation and the formation of oxygen vacancies, resulting in an impurity state in the TiO 2 band gap, which improves the absorption of visible light by narrowing the band gap. , Nonmetal doping, such as the nitrogen incorporation into the TiO 2 lattice or on its surface, has been reported to benefit the improvement of photoefficiency under UV/visible light . Both single doping and codoping methods have been applied to the TiO 2 photocatalyst fabrication by incorporating various elements into the crystal structure. ,− The addition of foreign elements results in lattice distortions and changes in the E g due to electronegativities, ionic radius differences, and introductions of impurity states . In addition to chemical doping, various preparation methods of TiO 2 photocatalysts can influence the band gap narrowing differently.…”

Section: Introductionmentioning

confidence: 99%

Machine Learning Band Gaps of Doped-TiO₂ Photocatalysts from Structural and Morphological Parameters

Zhang

2020

ACS Omega

173

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Titanium dioxide (TiO2) photocatalysts in the form of thin films are of great interest due to their tunable optical band gaps, E g’s, which are promising candidates for applications of visible-light photocatalytic activities. Previous studies have shown that processing conditions, dopant types and concentrations, and different combinations of the two have great impacts on structural, microscopic, and optical properties of TiO2 thin films. The lattice parameters and surface area are strongly correlated with E g values, which are conventionally simulated and studied through first-principle models, but these models require significant computational resources, particularly in complex situations involving codoping and various surface areas. In this study, we develop the Gaussian process regression model for predictions of anatase TiO2 photocatalysts’ energy band gaps based on the lattice parameters and surface area. We explore 60 doped-TiO2 anatase photocatalysts with E g’s between 2.280 and 3.250 eV. Our model demonstrates a high correlation coefficient of 99.99% between predicted E g’s and their experimental values and high prediction accuracy as reflected through the prediction root-mean-square error and mean absolute error being 0.0012 and 0.0010% of the average experimental E g, respectively. This modeling method is simple and straightforward and does not require a lot of parameters, which are advantages for applications and computations.

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Comparison of optical and structural properties of Cu doped and Cu/Zr co-doped TiO2 nanopowders calcined at various temperatures

Cited by 36 publications

References 41 publications

Structural and optical properties of zirconium oxide (ZrO₂) nanoparticles: effect of calcination temperature

Structural and optical properties of zirconium oxide (ZrO₂) nanoparticles: effect of calcination temperature

Green and Rapid Synthesis of Copper-Doped TiO2 Nanoparticles with Increased Photocatalytic Activity

Machine Learning Band Gaps of Doped-TiO₂ Photocatalysts from Structural and Morphological Parameters

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Comparison of optical and structural properties of Cu doped and Cu/Zr co-doped TiO2 nanopowders calcined at various temperatures

Cited by 36 publications

References 41 publications

Structural and optical properties of zirconium oxide (ZrO2) nanoparticles: effect of calcination temperature

Structural and optical properties of zirconium oxide (ZrO2) nanoparticles: effect of calcination temperature

Green and Rapid Synthesis of Copper-Doped TiO2 Nanoparticles with Increased Photocatalytic Activity

Machine Learning Band Gaps of Doped-TiO2 Photocatalysts from Structural and Morphological Parameters

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Product

Resources

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Structural and optical properties of zirconium oxide (ZrO₂) nanoparticles: effect of calcination temperature

Structural and optical properties of zirconium oxide (ZrO₂) nanoparticles: effect of calcination temperature

Machine Learning Band Gaps of Doped-TiO₂ Photocatalysts from Structural and Morphological Parameters