Precursor nature and molarities effect on the optical, structural, morphological, and electrical properties of TiO2 thin films deposited by spray pyrolysis

Hafida, Attouche; Rahmane, Saâd; Hettal, Souheila; Kouidri, Nabila

doi:10.1016/j.ijleo.2019.163985

Cited by 23 publications

(5 citation statements)

References 16 publications

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“…It is noted that on increasing the precursor solution concentration up to 0.075 mol/L, the band gap was reduced from 2.72 to 2.56 eV, then it was risen to 2.64 eV at molarity 0.1 mol/L. Similar behavior of the narrowing in band gap energy upon the increased molarity solution was reported on metal oxide by Attouche et al [40] and Barir et al [41]. The drop in E g is consistent with the absorption edge to red shift described above in Fig.…”

Section: Transmittance Reflectance Absorption Coefficient Optical Ene...supporting

confidence: 79%

“…On the other hand, the high conductivity can be ascribed to the films' increased crystallinity. The increase of crystallite size with increase in the precursor molarity leads to a reduction of the trapping states at grain boundaries, and hence, the carrier mobility rises [40] as a consequence the conductivity increases. Otherwise, the resistivity and real part of dielectric constant have the same behavior, both are reducing as represent in Table 2.…”

Section: Electrical Propertiesmentioning

confidence: 99%

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Optoelectronic and Dielectric Properties of Tenorite CuO Thin Films Sprayed at Various Molar Concentrations

Ben Messaoud,

Ouahab,

Rahmane

et al. 2024

Period. Polytech. Chem. Eng.

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The work in hand presents the elaboration of CuO thin films using a home-made spray pyrolysis technique at room atmosphere. The films were synthesized on preheated glass substrate at 450 °C. The source solution molarity was varied from 0.025 to 0.1 mol/L. The films were characterized by employing X-Ray Diffraction technique, UV-Vis-NIR spectrophotometry, Scanning Electron Microscope imagery, Energy Dispersive Spectroscopy, and four-points probe techniques. The X-ray diffraction analysis confirmed that all films are polycrystalline with a preferred orientation along the plane (−111) of the monoclinic crystal structure phase of tenorite (CuO). The SEM images showed a homogeneous and smooth surface. Crystallinity and grain size were improved. The rise of solution concentration induced a reduction of transmittance and reflectance in the visible region. The energy gap, the absorption coefficient, the extinction coefficient, refractive index, dielectric constant (ԑr and ԑi) and loss energy were estimated from transmittance and reflectance data. The gap energy decreases from 2.72 to 2.56 eV. The film deposited for 0.025 mol/L exhibits the highest real part of the dielectric constant (ԑr ~ 17). The film resistivity which is in order of 102 Ω cm decreases with the increase of molar concentration. The estimated dielectric constant indicated that the resulting CuO thin films could be used as dielectric layers for optoelectronic devices working in Vis-NIR region of radiation. Furthermore, the relatively high band gap, high absorption coefficient and high conductivity of the film obtained at 0.075 mol/L, make them good candidates as absorption layers in solar cells applications.

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Section: Transmittance Reflectance Absorption Coefficient Optical Ene...supporting

confidence: 79%

Section: Electrical Propertiesmentioning

confidence: 99%

Optoelectronic and Dielectric Properties of Tenorite CuO Thin Films Sprayed at Various Molar Concentrations

Ben Messaoud,

Ouahab,

Rahmane

et al. 2024

Period. Polytech. Chem. Eng.

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“…In the laboratory, it can be produced by several facile methods, including hydrothermal, solvothermal, sol–gel, chemical precipitation, electrodeposition, direct oxidation, sonochemical, and microwave methods 44 . These methods necessitate the use of precursors such as titanium tetra-ethoxide Ti(OEt) 4 , titanium tetra-isopropoxide Ti(OPr i ) 4 , titanium ethoxide Ti(OC 2 H 5 ), titanium isopropoxide Ti(OC 3 H 7 ) 4 , titanyl sulfate TiOSO 4 , titanium tetrachloride TiCl 4 , and titanium trichloride TiCl 3 45 . Moreover, quality-grade TiO 2 powder is readily available for laboratory experiments from Sigma Aldrich and Merck suppliers with reasonable costs for research purposes.…”

Section: Resultsmentioning

confidence: 99%

Multi-criteria decision-making for prioritizing photocatalytic processes followed by TiO2-MIL-53(Fe) characterization and application for diazinon removal

Barjasteh-Askari

Nabizadeh

Najafpoor

et al. 2023

Sci Rep

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Multi-criteria decision-making (MCDM) can introduce the best option based on evidence. We integrated the Analytic Hierarchy Process (AHP) and the Technique for Order of Preference by Similarity to the Ideal Solution (TOPSIS) to prioritize the alternatives for photocatalytic diazinon removal in a bench scale and characterized TiO2-MIL-53(Fe) for this purpose. Criteria and alternatives were listed based on systematic literature reviews and expert opinions. Then, AHP and TOPSIS questionnaires were developed and distributed to an expert panel for pairwise comparisons. We converted the linguistic variables into the corresponding fuzzy values and used R for mathematical calculations. Then, TiO2-MIL-53(Fe) was synthesized and characterized for diazinon removal under LED visible light. The AHP ranked criteria as availability > degradation efficiency > safety for the environment > material cost > energy consumption > mineralization efficiency > photocatalyst reusability > safety for personnel > equipment cost. Based on TOPSIS, the order of alternatives was TiO2-containing/Visible light > ZnO-containing/UV light > TiO2-containing/UV light > ZnO-containing/Visible light > WO3-containing/UV light. With a bandgap of 1.8 eV, TiO2-MIL-53(Fe) could remove 89.35% of diazinon at 10 mg/L diazinon concentration, 750 mg/L catalyst dose, pH 6.8, and 180-min reaction time. Hybrid AHP-TOPSIS identified the best option for photocatalytic diazinon removal from aqueous solutions. Thus, MCDM techniques can use systematic review results to overcome the uncertainty in designing experimental studies.

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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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Precursor nature and molarities effect on the optical, structural, morphological, and electrical properties of TiO2 thin films deposited by spray pyrolysis

Cited by 23 publications

References 16 publications

Optoelectronic and Dielectric Properties of Tenorite CuO Thin Films Sprayed at Various Molar Concentrations

Optoelectronic and Dielectric Properties of Tenorite CuO Thin Films Sprayed at Various Molar Concentrations

Multi-criteria decision-making for prioritizing photocatalytic processes followed by TiO2-MIL-53(Fe) characterization and application for diazinon removal

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

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