Structural and optical properties of ZnO/TiO2 composites

Ayed, Sarra; Belgacem, Raoudha Ben; Zayani, Jaafar Othman; Matoussi, Adel

doi:10.1016/j.spmi.2016.01.004

Cited by 26 publications

(9 citation statements)

References 41 publications

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“…In addition to the determination of the lattice strain from the Scherrer equation using only the (101) GAXRD peak, the effects of internal stress from dopants and external stress from mechanical effects also can be considered through Williamson–Hall plots using all of the GAXRD peaks. The relevant calculations using the equations that are given in Appendix B are estimated based on the locations of the peaks.…”

Section: Resultsmentioning

confidence: 99%

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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Section: Resultsmentioning

confidence: 99%

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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“…These secondary phases lead to a decrease in the surface area and an increase in the bandgap energy. 32,33 In the case of ZnO doped with Ti, the solubility limit of Ti in ZnO has been reported to be less than 5 mol%. 34 The effects of dopant concentration on the electronic structure and electrocatalytic properties of ZnO have also been reported.…”

Section: Introductionmentioning

confidence: 99%

MWCNT/Ti‐doped ZnO nanocomposite as electrochemical sensor for detecting glutamate and ascorbic acid

Pitiphattharabun

Meesombad

Panomsuwan

et al. 2021

Int J Applied Ceramic Tech

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Attributed to high stability and reproducibility, non-enzymatic electrochemical sensors have been extensively utilized in detection of various chemical substances. In this study, multi-walled carbon nanotube (MWCNT)/Ti-doped ZnO composite was prepared for fabrication of working electrode used in detection of glutamate and ascorbic acid. Ti-doped ZnO particles with the average size of 44.47 ± 4.05 nanometers were synthesized by the solution combustion technique. Hydrothermal impregnation was employed in preparation of the MWCNT/Ti-doped ZnO composite. Electrocatalytic activities of the

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“…Other approaches are adding the dye sensitizer [16], coupling the TiO2 with another semiconductor [17][18][19] such as zinc oxide (ZnO) semiconductor that may prevent electron-hole recombination and enhance photocatalytic activity [17]. Whilst the TiO2/ZnO composite material can be prepared through sol-gel [17,18], solid-state sintering [20], and the physical mixing [21,22] methods, the physical mixing technique is the simplest one to prepare TiO2/ZnO composite materials. It was reported that the ZnO and TiO2 were physically mixed to obtain TiO2/ZnO composite materials for cosmetic [21] and dye-sensitized solar cell [22] purposes.…”

Section: Introductionmentioning

confidence: 99%

Activity Enhancement of P25 Titanium Dioxide by Zinc Oxide for Photocatalytic Phenol Degradation

Kurniawan

Yuliati

2021

Bull. Chem. React. Eng. Catal.

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As a benchmark photocatalyst, P25 titanium dioxide (TiO2) nanomaterial has been widely reported for its remarkable photocatalytic activity under ultraviolet (UV) irradiation. However, approaches to further improve the photocatalytic activity of the P25 TiO2 are still required. In the present work, we reported the activity enhancement of the P25 TiO2 up to more than five times higher rate constant for phenol degradation when the P25 TiO2 was coupled with zinc oxide (ZnO). The composites were prepared by a physical mixing method of P25 TiO2 and ZnO with various weight ratios of 1:0.5, 1:1, and 1:2. The composite materials were then characterized using X-ray diffraction (XRD), diffuse-reflectance ultraviolet-visible (DR UV-vis), Fourier transform infrared (FTIR), and fluorescence spectroscopies. All the composites gave better activity than the P25 TiO2, in which the TiO2/ZnO 1:1 composite material exhibited the highest first-order reaction rate constant (0.43 h−1). This remarkable enhanced degradation rate was much higher than that of the unmodified TiO2 (0.08 h−1) and ZnO (0.13 h-1). The fluorescence study revealed that the electron-hole recombination on the P25 TiO2 could be suppressed by the ZnO, which would be the reason for such activity enhancement. A study on the effect of the scavenger showed that the hydroxyl radicals played a crucial role in the photocatalytic phenol degradation. Copyright © 2021 by Authors, Published by BCREC Group. This is an open access article under the CC BY-SA License (https://creativecommons.org/licenses/by-sa/4.0).

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Structural and optical properties of ZnO/TiO2 composites

Cited by 26 publications

References 41 publications

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

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

MWCNT/Ti‐doped ZnO nanocomposite as electrochemical sensor for detecting glutamate and ascorbic acid

Activity Enhancement of P25 Titanium Dioxide by Zinc Oxide for Photocatalytic Phenol Degradation

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Structural and optical properties of ZnO/TiO2 composites

Cited by 26 publications

References 41 publications

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

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

MWCNT/Ti‐doped ZnO nanocomposite as electrochemical sensor for detecting glutamate and ascorbic acid

Activity Enhancement of P25 Titanium Dioxide by Zinc Oxide for Photocatalytic Phenol Degradation

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

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