The role of Al concentration on improving the photocatalytic performance of nanostructured ZnO/ZnO:Al/ZnO multilayer thin films

Binazir, Maryam Baradaran; Ghodsi, F. E.; Bittencourt, Carla; Llobet, Eduard

doi:10.1016/j.jallcom.2019.02.184

Cited by 74 publications

(28 citation statements)

References 81 publications

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“…Fe 2 O 3 , as a mid-band gap semiconductor, utilizes sunlight effectively in the photocatalysis process as compared to TiO 2 , which is the most researched photocatalyst [ 7 , 8 , 9 , 10 ]. Numerous methods were adopted to enhance the photocatalytic activity in metal oxide semiconductors, such as the formation of junctions and doping to prevent the electron-hole (e − /h + ) recombination and to enhance the photocatalysis process, where dopant ions act as charge traps, reducing the recombination of e − /h + [ 11 , 12 , 13 ]. The photocatalytic degradation of rhodamine B (RhB) with sprayed Fe 2 O 3 films under sunlight illumination was investigated.…”

Section: Introductionmentioning

confidence: 99%

Effect of Mg Doping on the Physical Properties of Fe2O3 Thin Films for Photocatalytic Devices

et al. 2022

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Undoped and Mg-doped (y = [Mg2+]/[Fe3+] = 1, 2, 3, and 4 at.%) Fe2O3 thin films were synthesized by a simple spray pyrolysis technique. The thin films were extensively characterized. X-ray diffraction (XRD) and energy-dispersive spectroscopy (EDS) analysis confirmed the successful insertion of Mg in the rhombohedral structure of Fe2O3. In addition, scanning electronic microscope (SEM) and confocal microscope (CM) images showed a homogenous texture of the film, which was free of defects. The rough surface of the film obtained by spray pyrolysis is an important feature for photocatalysis and gas sensor applications. The direct band gap of the doped Fe2O3 films obtained for [Mg2+]/[Fe3+] = 3 at.% was Edir = 2.20 eV, which recommends the Mg-doped iron oxide as an optical window or buffer layer in solar cell devices. The photodegradation performance of Mg-doped Fe2O3 was assessed by studying the removal of methylene blue (MB) under sunlight irradiation, with an effective removal efficiency of 90% within 180 min. The excellent photodegradation activity was attributed to the strong absorption of Mg-doped Fe2O3 in the UV and most of the visible light, and to the effective separation of photogenerated charge carriers.

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Section: Introductionmentioning

confidence: 99%

Effect of Mg Doping on the Physical Properties of Fe2O3 Thin Films for Photocatalytic Devices

et al. 2022

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“…Translucent oxides such as CuO, SnO 2 , and ZnO have invaded photovoltaic and detecting systems industrial sectors [1,2]. The inherited high excitation binding energy of ZnO [3], physical and chemical stability [4]. Based on these observed outstanding properties, ZnO has been widely used in the fabrication of photodetectors, reminiscence uses, LED,…”

Section: Introductionmentioning

confidence: 99%

Optical, Structural, and Crystal Defects Characterizations of Dip Synthesized (Fe-Ni) Co-Doped ZnO Thin Films

et al. 2020

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Sol-gel technique is used to synthesize as-grown zinc oxide (ZnO) and iron-nickel (Fe-Ni) co-doped ZnO thin films deposited on glass substrates using dip coating technique. The structural properties and crystal imperfections of as-prepared thin films are investigated. We performed the structural analysis of films using X-ray diffraction (XRD). The XRD analysis reveal that the as-prepared films exhibit wurtzite structure. Furthermore, XRD-line profile analysis is performed to study the correlation between structural properties and imperfections of the nanocomposite thin films. The crystallite size and microstrains parameters are predicted using the Williamson–Hall method. We found that the crystallites size increases as the co-doped (Fe-Ni) concentration is increased. However, microstrains of the nanocomposite films decreases as (Fe-Ni) concentration is increased. The optical properties of the (Fe-Ni) co-doped nanocomposite films are investigated by performing UV-Vis (250 nm–700 nm) spectrophotometer measurements. We found that as the (Fe-Ni) concentration level is steadily increased, transmittance of the undoped ZnO thin films is decreased. Remarkably, refractive index of undoped ZnO thin films is found to exhibit values extending from 1.55 to1.88 that would increase as (Fe-Ni) concentration is increased.

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“…Furthermore, the photocatalytic ability of ZnO materials was improved by doping metals which can control the active surface area, generate lattice defects, modify bandgap energy, and extend absorption range to visible light [28][29][30]. Many metals such as Al [31], Fe [32], Sn [33], Ag [34] etcetera doped in ZnO photocatalysts, are successfully utilized for the photodegradation of organic pollutants. Among these additive metals, tin (Sn) coincides with the cage structure of ZnO crystallization due to the similarity of ionic radius of Sn 4+ and Zn 2+ which are 0.071 nm and 0.074 nm, respectively [35].…”

Section: Introductionmentioning

confidence: 99%

Fabrication and characteristics of Zn_1–xSn_xO nanorod/ITO composite photocatalytic films

Dung

Tran

Duc

et al. 2020

Mater. Res. Express

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Zn 1−x Sn x O NRs/ITO composite photocatalytic films were fabricated by the hydrothermal method. A concentration of Sn dopant in Zn 1−x Sn x O nanorods (NRs) was varied from 0% to 7%. The structural and surface morphology characteristics of Zn 1−x Sn x O NRs/ITO composite photocatalytic films were investigated by X-Ray diffraction (XRD) and scanning electron microscopy (SEM), respectively. In addition, photocatalytic properties of synthesized materials were evaluated by degradation rates of Rhodamine-B aqueous solutions under UV light irradiation. The SEM results indicated that, with an increasing concentration of Sn dopant in Zn 1−x Sn x O NRs/ITO, the effective surface areas were declined by an exponential decay function and the reduction was negligible as the Sn doping concentration was higher than 3%. With the similarity in effective surface area, the contribution of Sn in the enhancement of the photocatalytic activity of Zn 0.93 Sn 0.07 O NRs/ITO is clearly observed with 41% improvement in comparison to ZnO NRs/ITO.

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The role of Al concentration on improving the photocatalytic performance of nanostructured ZnO/ZnO:Al/ZnO multilayer thin films

Cited by 74 publications

References 81 publications

Effect of Mg Doping on the Physical Properties of Fe2O3 Thin Films for Photocatalytic Devices

Effect of Mg Doping on the Physical Properties of Fe2O3 Thin Films for Photocatalytic Devices

Optical, Structural, and Crystal Defects Characterizations of Dip Synthesized (Fe-Ni) Co-Doped ZnO Thin Films

Fabrication and characteristics of Zn_1–xSn_xO nanorod/ITO composite photocatalytic films

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The role of Al concentration on improving the photocatalytic performance of nanostructured ZnO/ZnO:Al/ZnO multilayer thin films

Cited by 74 publications

References 81 publications

Effect of Mg Doping on the Physical Properties of Fe2O3 Thin Films for Photocatalytic Devices

Effect of Mg Doping on the Physical Properties of Fe2O3 Thin Films for Photocatalytic Devices

Optical, Structural, and Crystal Defects Characterizations of Dip Synthesized (Fe-Ni) Co-Doped ZnO Thin Films

Fabrication and characteristics of Zn1–xSnxO nanorod/ITO composite photocatalytic films

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Fabrication and characteristics of Zn_1–xSn_xO nanorod/ITO composite photocatalytic films