Thickness effect on structural, optoelectronic properties and photocatalytic activity of low-cost spin-coated In2O3 films

Ghemid, M.; Gueddaoui, H.; Hemissi, M.; Khelladi, M. R.; Bourzami, Riadh

doi:10.1016/j.cplett.2021.139089

Cited by 17 publications

(4 citation statements)

References 57 publications

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“…In photoinduced contaminant removal processes, the quantity and redox capacity of photogenerated electron–hole pairs are primarily responsible for the contaminant degradation and determine the efficiency of the desired photoassisted reaction . To date, some of the most widely investigated photodriven systems for contaminant removal comprise wide-band-gap metal oxide semiconductors, such as TiO 2 , , Ga 2 O 3 , , and In 2 O 3 , , that are active only under ultraviolet (UV) irradiation. Although UV light contains more energy per photon than visible light, UV light only represents ∼6% of the solar spectrum, whereas visible light makes up to ∼27% of the total available number of photons from incoming solar radiation.…”

Section: Introductionmentioning

confidence: 99%

Surface Adsorption and Photoinduced Degradation: A Study of Spinel Ferrite Nanomaterials for Removal of a Model Organic Pollutant from Water

Sanchez-Lievanos,

Sun,

Gendrich

et al. 2024

Chem. Mater.

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Spinel oxide nanocrystals are attractive materials for photoinduced advanced oxidation processes that degrade organic pollutants in water due to their chemical stability and tunability, visible light absorption, and magnetic recoverability. However, a systematic understanding of the structural and chemical factors that control the reactivity of specific spinel oxide nanocrystal materials toward photoinduced degradation processes is lacking. This Perspective illustrates these knowledge gaps through an investigation into the impacts of surface chemistry and composition of spinel ferrite nanocrystals of formula MFe 2 O 4 (M = Mg, Fe, Co, Ni, Cu, Zn) on their ability to remove a model organic pollutant (methyl orange (MO)) from water. We identify two mechanisms by which the nanocrystals remove MO from water: (i) surface adsorption and (ii) photoinduced degradation under visible light irradiation in the presence of hydrogen peroxide via the photo-Fenton reaction. Nanocrystals that do not contain any surface ligands are more effective at removing MO from water than nanocrystals that contain surface ligands, despite our observation that the ligand-less nanocrystals do not form stable colloidal dispersions in water, while ligand-coated nanocrystals are colloidally stable. For many of the spinel ferrite compositions studied here, the fraction of methyl orange removal via adsorption to the nanocrystal surface in the absence of photoexcitation is larger than the fraction removed under irradiation. Our data indicate that the composition-dependent surface charge of the nanocrystals controls the degree of surface adsorption of the charged MO molecule. Overall, these results demonstrate that careful consideration of the impacts of surface chemistry on the behavior of spinel ferrite nanocrystals is required to accurately assess and subsequently understand their activity toward the photoinduced degradation of organic molecules.

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Section: Introductionmentioning

confidence: 99%

Surface Adsorption and Photoinduced Degradation: A Study of Spinel Ferrite Nanomaterials for Removal of a Model Organic Pollutant from Water

Sanchez-Lievanos,

Sun,

Gendrich

et al. 2024

Chem. Mater.

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“…M Ghemid et al deposited In 2 O 3 thin films on the glass substrates by spincoating method. They studied the effect of layer thickness on the structural, electrical, optical and photocatalytic properties [31]. Among various techniques, the dip-coating method seems to be easy and better to control deposition parameters such as the thickness and number of coating layers [27].…”

Section: Introductionmentioning

confidence: 99%

Enhanced visible light photocatalytic activity of nanostructured SiO₂-TiO₂ thin films through optimizing thickness

Darvish,

Masoudi,

Mortezaali

et al. 2023

Phys. Scr.

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Thin films of silicon dioxide-titanium dioxide (SiO2-TiO2) with different thicknesses were deposited by a simple dip-coating method in a repetition behavior followed by heating processes. Choosing the optimum thickness is accounted as an approach for improving photocatalytic and hydrophilicity properties of a thin film. The obtained results from FESEM and AFM characterizations showed that with increasing thickness, the surface roughness increases from 3.089nm to 132.8nm. The XRD patterns indicate the presence of anatase phase for the SiO2-TiO2 thin film. Optical measurements were used to calculate thickness, generation rate of photocarriers, band gap, and refractive index of the samples. Decrease of band gap with increasing thickness makes the layer more proper for photocatalytic activity under visible light. It is obtained that the generation rate of carriers has the highest value (17.16×1024 m-3s-1) for the thickness of 336 nm. PL spectra for the thickness of 336 nm confirmed the presence of defects which reduce the recombination rate and improve charge carrier separation. XPS was used to distinguish the chemical composition. Variation of defect concentrations, number of grain boundaries, and surface roughness with thickness were considered as the main parameters affecting the photocatalytic performance. The highest photodegradation was obtained for 336 nm thick film under illumination of visible light (100% degradation of 40 ml solution of 10 mg/L methylene blue (MB)). This research provides a systematic study on the structural and optical properties of the different thick SiO2-TiO2 films with goal of enhancing photocatalytic activity in the visible light region.

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“…Thin films of transparent conductive oxide such as ZnO [1], TiO2 [2], In2O3 [3], and SnO2 [4], are the most scientific research subjects in current applications, and the most common is SnO2 due to its large band gap (3.65 V at 300 K) [5] making it the most widely used in many applications such as a transparent electrode in photovoltaic transformers, amorphous silicon solar cells, liquid crystal display and gas-discharge display [6]. It can be deposited by a number of mechanisms such as spraying pyrolysis [7], L-CVD [8] spin coating [9], theoretically the SnO2 thin film has a low electrical conductivity because its charge carriers have low mobility as well as its low-density charge carrier [5], which leads us to dope it with many elements to improve the most important physical properties, namely the electrical and optical properties, we can mention from these elements: Zr [10], Cu [11],Sb [12]…..etc.…”

Section: Introductionmentioning

confidence: 99%

Effect of (Al, Zn, Cu, and Sr) doping on structural, optical and electrical properties of sprayed SnO2 thin films

Saoula,

Siad,

Djedidi

et al. 2023

Acta Metall Slovaca

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Tin dioxide thin films deposited onto a glass substrate were prepared by spray pyrolysis technique, and then doped with different elements which are: Al, Zn, Cu, and Sr by electroplating method, these elements were chosen for their different atomic radii. XRD illustrate that all the films were polycrystalline with a tetragonal rutile structure and a strong preferred orientation of (200) plane. Uv-vis spectrophotometer specters showed that the highest average transmittance of Al/SnO2 film was about 86.77% in the visible region and the Sr/SnO2 film had the highest band gap of 3.95 eV. From the MEB images, the morphological characteristics improved when the SnO2 thin films doped with Al and Zn but the opposite happened when it doped with Cu and Sr. The four-point probe showed that the best sample was for Al/SnO2 because it had the highest electrical conductivity around 692.306 (Ω.cm) -1.

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Thickness effect on structural, optoelectronic properties and photocatalytic activity of low-cost spin-coated In2O3 films

Cited by 17 publications

References 57 publications

Surface Adsorption and Photoinduced Degradation: A Study of Spinel Ferrite Nanomaterials for Removal of a Model Organic Pollutant from Water

Surface Adsorption and Photoinduced Degradation: A Study of Spinel Ferrite Nanomaterials for Removal of a Model Organic Pollutant from Water

Enhanced visible light photocatalytic activity of nanostructured SiO₂-TiO₂ thin films through optimizing thickness

Effect of (Al, Zn, Cu, and Sr) doping on structural, optical and electrical properties of sprayed SnO2 thin films

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Thickness effect on structural, optoelectronic properties and photocatalytic activity of low-cost spin-coated In2O3 films

Cited by 17 publications

References 57 publications

Surface Adsorption and Photoinduced Degradation: A Study of Spinel Ferrite Nanomaterials for Removal of a Model Organic Pollutant from Water

Surface Adsorption and Photoinduced Degradation: A Study of Spinel Ferrite Nanomaterials for Removal of a Model Organic Pollutant from Water

Enhanced visible light photocatalytic activity of nanostructured SiO2-TiO2 thin films through optimizing thickness

Effect of (Al, Zn, Cu, and Sr) doping on structural, optical and electrical properties of sprayed SnO2 thin films

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Enhanced visible light photocatalytic activity of nanostructured SiO₂-TiO₂ thin films through optimizing thickness