The determination of urbach energy and optical gap energy by many methods for Zn doped NiO thin films fabricant semiconductor by spray pyrolysis

Zaouche, C.; Gahtar, Abdelouahab; Benramache, Said; Derouiche, Y.; Kharroubi, M.; Belbel, A.; Maghni, C.; Dahbi, L.

doi:10.15251/djnb.2022.174.1453

Cited by 8 publications

(8 citation statements)

References 28 publications

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“…It turned out that the occurrence of shift even during extremely high doping is related to the non‐covalent effect of the dopant on the base material. The red shift and blue shift of the absorbance band were evaluated by determination of Urbach energy ( E U ) [33, 34] and Burstein–Moss effect [35], respectively. The Burstein–Moss effect mainly occurs with a blue shift of the band gap in semiconductors doped with high amounts of metals.…”

Section: Resultsmentioning

confidence: 99%

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Fullerene (C₆₀)‐doped zinc‐aluminium layered double hydroxide/polyvinyl alcohol nanocomposites: Synthesis, characterization, and photodegradation of methylene blue from water solution

Balayeva,

Israfilli,

Azizov

2023

J Chinese Chemical Soc

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IntroductionLayered double hydroxides (LDHs) are widely studied anionite clays consisting of positively‐charged hydroxide nanosheets which is described by the general formula: [M(II)1−xM(III)x(OH)2][An−·mH2O], where M(II) and M(III) are the divalent (e.g., Mg2+, Zn2+, Ca2+, Co2+, Ni2+, etc.) and trivalent (e.g., Al3+, Fe3+, Cr3+, etc.) metal ions, An− and H2O is the interlamellar anion (e.g., Cl¯, Br¯, NO3¯, CO32¯, SO42¯, SeO42¯) for charge‐neutralization and hydrated state, respectively. They have been widely used in different industry sectors, in materials science and research. Polymer/LDH nanocomposites have gained significant attention in recent years.Carbon‐based nanomaterials, like fullerene, carbon nanotubes (CNT), graphene and graphene oxide have attracted significant attention. Fullerene molecules (C60, C70) are used as reinforcing material for polymers to improve their mechanical, thermal, optical, energy storage and charge transport properties.ObjectivesC60‐doped ZnAl‐layered double hydroxide/polyvinyl alcohol nanocomposites were successfully synthesized and their photocatalytic activity for photodegradation of methylene blue (MB) synthetic dye was quantitatively analyzed by ultraviolet (UV) spectroscopy. The effect of C60 on the optical, structural, morphological properties, and photocatalytic activity of LDHs was investigated, and the impact of C60/LDH mass ratio and aging time on the properties was also studied.MethodsFullerene‐doped ZnAl‐LDH/PVA nanocomposites were synthesized via urea hydrolysis and coprecipitation‐coformation method. First, 10 wt% PVA/water solution (40 mL) is added into the mixed solution containing 0.015 mol of Zn(NO3)2·6H2O and 0.005 mol of Al2(SO4)3·9H2O and titrated by 2 M of NaOH and 1 M of NaHCO3 mixed base solution to adjust pH 9. The obtained white slurry was shaken very hard and aged for 1 year. The obtained samples were marked by the mass percentage of C60 as 1% C60@LDH/PVA, 10% C60@LDH/PVA, 20% C60@LDH/PVA, and 60% C60@LDH/PVA.Results and DiscussionThe basal spacing of C60‐doped ZnAl‐LDH was estimated to be 9.217 Å which is wide enough from the general LDH (~7.0 Å). The crystallite size of nanoparticles is 9.217 nm and ~6 nm by Scherrer's equation and Williamson–Hall method from the XRD data, respectively. Rice‐shaped 2D morphology was formed with 100 nm–2 μm width and 500 nm–10 μm in length by SEM. The maximal photodegradation efficiency was found with 20% of C60 doping (PD% = 96.98) after 360 min, where the sorption efficiency with this compound is very high (R% = 85.55).ConclusionsIn the presented work, the effect of C60 on the optical, structural, morphological properties, and photocatalytic activity of LDHs was investigated, and the impact of C60/LDH mass ratio and aging time on the properties was also studied. For the identification of the photocatalytic activity of obtained C60/LDH nanocomposites, MB was used as a model pollutant and the efficiency of the Zn/Al LDH nanocomposite, with various quantities of fullerene, is also evaluated.

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Section: Resultsmentioning

confidence: 99%

“…The red shift and blue shift of the absorbance band were evaluated by determination of Urbach energy (E U ) [33,34] and Burstein-Moss effect [35], respectively. The Burstein-Moss effect mainly occurs with a blue shift of the band gap in semiconductors doped with high amounts of metals.…”

Section: Scherrer's Methodsmentioning

confidence: 99%

Fullerene (C₆₀)‐doped zinc‐aluminium layered double hydroxide/polyvinyl alcohol nanocomposites: Synthesis, characterization, and photodegradation of methylene blue from water solution

Balayeva,

Israfilli,

Azizov

2023

J Chinese Chemical Soc

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“…The latter comes from the Ag + donor ions in the substitutional sites of Ni +2 and the formation of the molecular NiAg2O existed on the surface. The increase in the conductivity of deposited films after 4 at.% can be related to the increase of the potential barriers, because the introduced atoms are segregated into the grain boundaries [38][39] . The Ni0.96Ag0.04O thin films have best electrical properties.…”

Section: Electrical Properties Of Ni1-xagxo Thin Filmsmentioning

confidence: 99%

Study the Effect of Ni Doping on Structural, Optical and Electrical Properties of Ni1-xAgxO Thin Films Deposited by Spray Pyrolysis Technique

Zaouche,

Khelaifa

2024

IJAMRS

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The effect of Ag doping on optical, structural and electrical properties of deposited Ni1-xAgxO thin films on glass substrate by spray pyrolysis technique has been studied. The main objective of this research is to study the change of the physical and optical properties of Ni1-xAgxO thin films that are fabricant to semiconductor with different doping levels x. These levels are 0 at.%, 2 at.%, 4 at.%, 8 at.% and 10 at.%. The transmission spectra show that the Ni1-xAgxO thin films have a good optical transparency in the visible region from 68 to 83%. The optical gap energy of the Ni1-xAgxO thin films varied between 3.70 and 3.81 eV. The urbach energy varied between 245 and 289 meV. However, the Ni0.96Zn0.04O thin films have many defects with maximum value of urbach energy. The Ni0.96Ag0.04O thin films have minimum value of optical gap energy. The Ni0.96Ag0.04O thin films have maximum value of the electrical conductivity which is 0.023 (Ω.cm)-1. The Ni0.92Ag0.08O thin films have maximum value of the transmission which is 83%. The average electrical conductivity of our films is about (0.0184 (Ω.cm)-1). XRD patterns of the Ni1-xAgxO thin films indicate that films are polycrystalline with cubic structure.

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“…The residual stress (ε hkl ) and the dislocation density (δ hkl ) in the layer were evaluated using the following formulae [16]:…”

Section: X-ray Diffractionmentioning

confidence: 99%

Growth and characterization of bimetallic (Ni,Co) sulfide thin films deposited by spray pyrolysis

Gahtar¹,

Zaouche²,

Ammari³

et al. 2023

Self Cite

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In this work, the bimetallic (Ni,Co) sulfide film of 852.213 nm thickness was successfully deposited using the spray pyrolysis technique at 300 °C. The compound was prepared with a mixture of nickel acetate (C4H6O4Ni. 4H2O), cobalt chloride (CoCl2. 6H2O), and thiourea (CS(NH2)2) as precursors for Ni, Co, and S, respectively. The temperature and sedimentation time were 300 °C and 10 min, respectively; the film was then, characterized without any thermal post-treatment. The structural, morphological, optical and electrical analysis were carried out to investigate the different properties of the material. The X-ray diffraction analysis confirmed the presence of NiCo2S4 according to the JCPDS Card # 98- 004-0019, with an average crystallite size of 34.45 nm. The optical analysis revealed the metallic behavior of the film with an average transmittance of 3.41% in the visible region and a direct optical band gap of 2.15 eV, as well as a high absorption coefficient of α ≈ 104 - 105 cm-1 ). The elementary composition analysis (EDS) confirmed the presence of Ni, Co and S elements in the film. Morphological analysis revealed a homogeneous, compact, crack-free appearance and a granular surface in all studied areas. On the other hand, the film shows a high electrical conductivity of about 1.42×105 S/cm at room temperature. The obtained results show that the bimetallic (Ni, Co) sulfide prepared in this study exhibits a good crystallinity, dense morphology, good stoichiometric ratio and high conductivity. Therefore, it is a potential candidate for application in supercapacitors as electrode material.

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The determination of urbach energy and optical gap energy by many methods for Zn doped NiO thin films fabricant semiconductor by spray pyrolysis

Cited by 8 publications

References 28 publications

Fullerene (C₆₀)‐doped zinc‐aluminium layered double hydroxide/polyvinyl alcohol nanocomposites: Synthesis, characterization, and photodegradation of methylene blue from water solution

Fullerene (C₆₀)‐doped zinc‐aluminium layered double hydroxide/polyvinyl alcohol nanocomposites: Synthesis, characterization, and photodegradation of methylene blue from water solution

Study the Effect of Ni Doping on Structural, Optical and Electrical Properties of Ni1-xAgxO Thin Films Deposited by Spray Pyrolysis Technique

Growth and characterization of bimetallic (Ni,Co) sulfide thin films deposited by spray pyrolysis

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The determination of urbach energy and optical gap energy by many methods for Zn doped NiO thin films fabricant semiconductor by spray pyrolysis

Cited by 8 publications

References 28 publications

Fullerene (C60)‐doped zinc‐aluminium layered double hydroxide/polyvinyl alcohol nanocomposites: Synthesis, characterization, and photodegradation of methylene blue from water solution

Fullerene (C60)‐doped zinc‐aluminium layered double hydroxide/polyvinyl alcohol nanocomposites: Synthesis, characterization, and photodegradation of methylene blue from water solution

Study the Effect of Ni Doping on Structural, Optical and Electrical Properties of Ni1-xAgxO Thin Films Deposited by Spray Pyrolysis Technique

Growth and characterization of bimetallic (Ni,Co) sulfide thin films deposited by spray pyrolysis

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Fullerene (C₆₀)‐doped zinc‐aluminium layered double hydroxide/polyvinyl alcohol nanocomposites: Synthesis, characterization, and photodegradation of methylene blue from water solution

Fullerene (C₆₀)‐doped zinc‐aluminium layered double hydroxide/polyvinyl alcohol nanocomposites: Synthesis, characterization, and photodegradation of methylene blue from water solution