XRD analysis of undoped and Fe doped TiO2 nanoparticles by Williamson Hall method

Bharti, Bandna; Barman, P. B.; Kumar, Rajesh

doi:10.1063/1.4929241

Cited by 16 publications

(13 citation statements)

References 4 publications

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“…The estimated average particle sizes were 18.58 ± 2.73 nm, 18.40 ± 2.26 nm, 17.00 ± 2.57 nm, and 16.54 ± 3.02 nm for pure TiO 2 , and 1, 2, and 5 mol% of Fe-TiO 2 , respectively. A decrease in diameter was observed with the increase of iron content, which has been previously reported [ 56 , 78 , 79 ]. A more pronounced decrease in the nanoparticle size was achieved when the Fe concentration was above 2 mol%.…”

Section: Resultssupporting

confidence: 82%

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Enhanced Fe-TiO2 Solar Photocatalysts on Porous Platforms for Water Purification

et al. 2022

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In this study, polyethylene glycol-modified titanium dioxide (PEG-modified TiO2) nanopowders were prepared using a fast solvothermal method under microwave irradiation, and without any further calcination processes. These nanopowders were further impregnated on porous polymeric platforms by drop-casting. The effect of adding iron with different molar ratios (1, 2, and 5%) of iron precursor was investigated. The characterization of the produced materials was carried out by scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDS), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and Raman spectroscopy. Optical characterization of all the materials was also carried out. SEM showed that pure TiO2 and Fe-TiO2 nanostructures presented similar nanosized and spherical particles, which uniformly covered the substrates. From XRD, pure TiO2 anatase was obtained for all nanopowders produced, which was further confirmed by Raman spectroscopy on the impregnated substrates. XPS and UV–VIS absorption spectroscopy emission spectra revealed that the presence of Fe ions on the Fe-TiO2 nanostructures led to the introduction of new intermediate energy levels, as well as defects that contributed to an enhancement in the photocatalytic performance. The photocatalytic results under solar radiation demonstrated increased photocatalytic activity in the presence of the 5% Fe-TiO2 nanostructures (Rhodamine B degradation of 85% after 3.5 h, compared to 74% with pure TiO2 for the same exposure time). The photodegradation rate of RhB dye with the Fe-TiO2 substrate was 1.5-times faster than pure TiO2. Reusability tests were also performed. The approach developed in this work originated novel functionalized photocatalytic platforms, which were revealed to be promising for the removal of organic dyes from wastewater.

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Section: Resultssupporting

confidence: 82%

“…Moreover, the increase of iron content led to a decrease in the crystallite and particle sizes, respectively. As reported, doping with Fe ions could inhibit the growth of TiO 2 anatase crystals, leading to smaller particles [ 78 , 79 , 82 ]. Hence, it can be suggested that this effect is more pronounced for higher iron contents.…”

Section: Resultsmentioning

confidence: 94%

Enhanced Fe-TiO2 Solar Photocatalysts on Porous Platforms for Water Purification

et al. 2022

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“…However, the nature of GAXRD and the low crystallinities of the thin films are such that the calculations do not provide definitive data, as revealed by the very low coefficients of determination r 2 for 0.180 for the undoped TiO 2 thin film in Figure a and 0.273, for all of the codoped TiO 2 thin films in Figure b. Despite these limitations, the data suggest positive slopes, indicating that the thin films exhibit lattice expansion. , Although V O •• are considered to be an intrinsic feature of undoped TiO 2 , hence TiO 2– x , the assumption of their effect on the lattice volume is contradictory, with both expansion and contraction − being reported. The reported single-crystal lattice parameters for anatase are a = 0.3799 nm and c = 0.9539 nm ( c / a axial ratio = 2.511), whereas those of the undoped TiO 2 thin film from Table are a = 0.3888 nm and c = 0.9713 nm ( c / a axial ratio = 2.498).…”

Section: Resultsmentioning

confidence: 92%

Structural and Microstructural Effects of Mo³⁺/Mo⁵⁺ Codoping on Properties and Photocatalytic Performance of Nanostructured TiO₂ Thin Films

et al. 2019

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Mo 3+ /Mo 5+ equally codoped TiO 2 thin films (0.050−0.100 mol % individually) were fabricated by spin coating on polished fused silica glass substrates followed by annealing at 450 °C for 2 h. The highly transparent (>80%) films consisted of poorly crystallized single-crystal anatase, where interstitial solid solubility decreases the lattice parameters, with a reversed trend at the highest codoping level arising from supersaturation and V O •• formation. The crystallinities correlate with the alternating trends of peak intensities and shifts in both the glancing angle X-ray diffraction and Raman data. X-ray photoelectron spectroscopy data reveal the absence of any valence changes, indicating that intervalence charge transfer is not relevant. Although there are four potential midgap states that may alter the E g (Mo i, and V Ti ⁗), any effects from them on the performance would be mitigated by the annihilation of the charge-compensating V O ••. As the E g values correlate with the lattice parameters, the principal driver of the E g is the residual lattice compressive strain. However, the photocatalytic performance is principally a function of the crystallinity.

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“…The mean crystallite size values calculated using different methods show variation due to particle size distribution 26 . Positive values indicate presence of tensile strain, which may be due to lattice expansion of TiO 2 structure 18,28,29 …”

Section: Resultsmentioning

confidence: 99%

“…26 Positive values indicate presence of tensile strain, which may be due to lattice expansion of TiO 2 structure. 18,28,29 F I G U R E 3 Fourier transform infrared spectroscopy (FTIR) spectra of Fe-doped TiO 2 nanoparticles at various doping concentrations FeT-0%, FeT-1%, FeT-5%, and FeT-10%…”

Section: Size-strain Plot W-h Plot Size-strain Plotmentioning

confidence: 99%

Defect‐mediated optical properties of Fe‐substituted TiO₂ nanoparticles

Rathore

Kulshreshtha

Shukla

et al. 2022

Int J Applied Ceramic Tech

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Here, sol-gel derived Fe-TiO 2 anatase nanoparticles with varying concentrations of Ti (1-x) Fe x O 2 (x = 0%, 1%, 5%, 10%) were prepared. The structural, morphological, and optical properties of prepared samples were studied. X-ray diffraction (XRD) patterns show the formation of pure anatase phase. The mean crystallite size of Fe-TiO 2 decreases with increase in the concentration of Fe. Fourier transform infrared spectroscopy (FTIR) spectra confirmed the presence of Ti-O vibrational band for all the samples. In Raman spectrum, peak broadening and red shifting linked with Eg ∼144 cm -1 divulge the Fe substitution at Ti sites into host lattice structure. Photoluminescence (PL) spectra verified nine peaks related to near band-edge emission and various defect states. The UV-vis diffuse reflectance spectra represent redshift and reduction in the bandgap energy. Scanning electron microscopy (SEM) and transmission electron microscopy (TEM) investigations show that the size of the grains decreases with increase in Fe doping concentration. The study shows that Fe-doped TiO 2 anatase phase nanoparticles are suitable for photocatalytic activity and solar cell applications.

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XRD analysis of undoped and Fe doped TiO2 nanoparticles by Williamson Hall method

Cited by 16 publications

References 4 publications

Enhanced Fe-TiO2 Solar Photocatalysts on Porous Platforms for Water Purification

Enhanced Fe-TiO2 Solar Photocatalysts on Porous Platforms for Water Purification

Structural and Microstructural Effects of Mo³⁺/Mo⁵⁺ Codoping on Properties and Photocatalytic Performance of Nanostructured TiO₂ Thin Films

Defect‐mediated optical properties of Fe‐substituted TiO₂ nanoparticles

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XRD analysis of undoped and Fe doped TiO2 nanoparticles by Williamson Hall method

Cited by 16 publications

References 4 publications

Enhanced Fe-TiO2 Solar Photocatalysts on Porous Platforms for Water Purification

Enhanced Fe-TiO2 Solar Photocatalysts on Porous Platforms for Water Purification

Structural and Microstructural Effects of Mo3+/Mo5+ Codoping on Properties and Photocatalytic Performance of Nanostructured TiO2 Thin Films

Defect‐mediated optical properties of Fe‐substituted TiO2 nanoparticles

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Structural and Microstructural Effects of Mo³⁺/Mo⁵⁺ Codoping on Properties and Photocatalytic Performance of Nanostructured TiO₂ Thin Films

Defect‐mediated optical properties of Fe‐substituted TiO₂ nanoparticles