ELHADJ Benrezgua

عقوني اسامة

دراسة استخدام مواد نانوية من اكسيد النيكل المشوب بالنحاس لتخزين الطاقة

This investigation explored the structural, thermodynamic and elastic features of two predicted halide perovskites, CdLiF 3 and CdLiCl 3 , using reliable first-principles computations. The relaxed crystalline structures were ascertained utilizing various exchange-correlation functionals. Our results align with previously reported data, particularly when utilizing the GGA-PBE functional. Both compounds analyzed demonstrate considerable thermodynamic and mechanical stability. The study accurately predicts various physical parameters associated with the elasticity characteristics of monocrystalline and polycrystalline forms of the considered materials. CdLiF 3 exhibits greater hardness compared to CdLiCl 3 . Temperature-dependent fluctuations of specific macroscopic physical characteristics, such as lattice parameters, volumetric thermal expansion parameter, Debye temperature and thermal capacity, were assessed using the quasi-harmonic approximation alongside first-principles computations.

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AMMAR Boukhari , Djamel ALLALI , ELHADJ Benrezgua , SABER SAAD ESSAOUD , Rabie AMARI , Bureau de la stratégie de numérisation , Bureau de la stratégie de numérisation , Bureau de la stratégie de numérisation , Bureau de la stratégie de numérisation , Abdelmadjid Bouhemadou,, Abdelhak Bedjaoui, Missoum Radjai, , (2026-01-12), Effects of temperature and pressure on the structural, elastic, and thermodynamic properties of halogenated perovskites CdLiCl 3 and CdLiF 3, International Journal of Modern Physics C, Vol:0, Issue:0, pages:00, World Scientic Publishing Company

Thin films of pure NiO and Cu doped NiO (CNO) were synthesized using the sol–gel spin-coating route. All samples exhibited a cubic phase with a predominant orientation along the (200) axis, which relaxed with Cu doping. Surface morphology showed an increase in grain size with molarity (36.20–129.9 nm), resulting in a rougher surface texture with a smoother and more uniform surface after Cu doping (Rrms: 91.30–13.80 nm), leading to a decrease in average transmittance and a slight reduction in band gap energy (Eg: 3.62–3.56 eV). The structural, electronic and optical properties of NiO and CNO structures were analyzed by implementing the density functional theory corrected by the Hubbard approach (DFT+GGA+U). The study highlighted the coexistence of ionic and covalent bonding. The DFT+GGA+U method allowed a notable improvement in the calculated Eg (3.57 eV for x=0% and 3.55 for 6.25%), revealing a decrease in Eg with Cu doping. The dielectric functions showed three main peaks, while the static dielectric constants underwent minor variations in response to Cu doping. Electrochemical analysis revealed n-type behavior, high energy efficiency (88%), and specific capacitance up to 37.8 F.g−1, confirming the suitability of CNO/ITO electrode for supercapacitor applications.

Citation

ELHADJ Benrezgua , , (2025-12-03), Synthesis of Cu-Doped NiO thin films for supercapacitors applications: experimental and first principles analysis, Journal of Solid State Electrochemistry, Vol:10008, Issue:0, pages:10008, Fathi Messaoudi

We analyzed the structural, elastic, and thermodynamic attributes of the trigonal-type Zintl phases CaZn2Sb2 and SrZn2Sb2 under hydrostatic pressure through using ab initio calculations within the density functional theory framework. The predicted structural parameters agree excellently with the available experimental values, which strongly validate our method. For both of the chemicals investigated, the [001] crystal orientation exhibits a higher compressibility than the [100] direction. Both compounds predicted monocrystalline elastic constants meet the mechanical stability requirements over a pressure range of up to 20 GPa. The polycrystalline mechanical characteristics were also examined at pressures up to 20 GPa. Indicators such as Pugh’s coefficient, Poisson’s ratio and Cauchy pressure confirm the brittleness of the studied compounds. At constant pressures of 0, 5, 10, 15, and 20 GPa, the temperature dependence of important macroscopic physical parameters was studied using the quasiharmonic Debye approximation. These parameters include 2 the lattice parameter, bulk modulus, volumetric thermal expansion coefficient, Debye temperature, and isobaric and isochoric heat capacities. The results are deemed trustworthy because the data acquired from the elastic constants correspond most closely to those calculated from the Debye quasiharmonic approximation.

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Djamel ALLALI , ELHADJ Benrezgua , Rabie AMARI , SABER SAAD ESSAOUD , AMMAR Boukhari , Fares ZERARGA, Abdelhak BEDJAOUI, Missoum RADJAI, ,(2025-11-20), Structural, elastic and thermodynamic characteristics of trigonal-type Zintl phases XZn2Sb2 (X = Ca or Sr) under hydrostatic pressure: Prospects for Advanced Materials in High-Pressure and Thermoelectric Devices,THE 2nd NATIONAL CONFERENCE ON PHYSICS AND IT’S APPLICATIONS,BOUSAADA, ALGERIA

The effect of metal ion (MI) doping on the properties of zinc oxide nanoparticles (ZnO-NPs), was investigated. ZnO-NPs doped with a small amount (1.7 %) of Al, Ag, Cu, and Mn were successfully synthesized. X-ray diffraction (XRD) confirmed the retention of the hexagonal wurtzite structure after doping, with no secondary phases observed. A clear correlation was established between the ionic radii of the dopants and the consistent changes in the structural, vibrational and morphological properties. Ultraviolet–visible (UV–visible) spectroscopy showed a noticeable widening of the optical bandgap, shifting from 3.70 eV (ZnO) to 3.90 eV (Al-doping), 4.04 eV (Ag- doping), 3.88 eV (Cu- doping), and 3.97 eV (Mn- doping).

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Rabie AMARI , Smail TERCHI , Djamel ALLALI , Bahri DEGHFEL , ABDELHAMID Guelil , AMMAR Boukhari , ELHADJ Benrezgua , Abdelhalim Zoukel, Ahmad Azmin Mohamad, , (2025-09-01), The effect of low concentrations of selected metal ions (Al, Ag, Cu, Mn) on the properties of ZnO nanoparticles prepared by the co-precipitation technique, Materials Letters, Vol:394, Issue:, pages:138677, Elsevier, Science Direct

The structural, electronic, and optical characteristics of CdLiF3 and CdLiCl3 halide perovskites were calculated using first-principles calculations based on density functional theory (DFT) employing the generalized gradient approximation (GGA) approach [1,2]. The structural parameters, comprising the lattice constants (a), bulk modulus (B), and its pressure derivative (B'), were computed for the examined compounds. The optimal lattice parameters were a=b=c= 3,699 Å for CdLiF3 and a=b=c= 4.607 Å for CdLiCl3. The electronic band structures and their associated total and partial density of states diagrams were also estimated. The compound CdLiF3 is a semiconductor with a bandgap of 1.96 eV, whereas CdLiCl3 is a semimetal conductor. The spectra of the frequency-dependent complex dielectric function, absorption coefficient, refractive index, extinction coefficient, reflectivity, and electron energy loss function were computed and analyzed.

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AMMAR Boukhari , Rabie AMARI , ELHADJ Benrezgua , Djamel ALLALI , Bahri DEGHFEL , ,(2025-08-20), Structural, electronic and optical properties of CdLiF3 and CdLiCl3 halide perovskites using first-principles calculation,INTERNATIONAL RESEARCH AND PRACTICE CONFERENCE “NANOTECHNOLOGY AND NANOMATERIALS”,Bukovel, UKRAINE

This study aims to prepare manganese-doped zinc oxide (MZO) thin films with low Mn content (x = 0, 2, 4 %) using the sol–gel spin coating method and to characterize their structural, optical, and magnetic properties. Experimental techniques were complemented by Density Functional Theory calculations with Hubbard correction (DFT-LDA + U). All films exhibit a polycrystalline wurtzite hexagonal phase of ZnO. As the Mn doping increases, all diffraction peaks are getting weaker, which leads to deterioration in the crystallinity of the samples. Furthermore, Mn doping affects the grain size (57.44–38.20 nm), the surface morphology (rms: 45.24–30.47 nm), the transmittance (93–54 %) and the optical band gap energy (Eg: 3.27–3.18 eV). Photoluminescence spectra reveals ultraviolet peaks (386–395 nm) along with weak green (525 nm) and strong (438 nm) and weak (475 nm) blue peaks. DFT-LDA + U calculations exhibits an antiferromagnetic phase with slightly reduced Eg (3.379 eV for x = 0 % and 3.267 for 3.7 %), attributed to the influence of Mn3d states near the Fermi level. This study presents a comprehensive analysis of low-content Mn-doped ZnO thin films by combining experimental and theoretical approaches. The findings provide valuable insights into the electronic, structural, optical, and magnetic properties of MZO, emphasizing the critical role of Mn 3d states in altering the magnetic behavior and adjusting Eg.

Citation

ELHADJ Benrezgua , Rabie AMARI , AMMAR Boukhari , Djamel ALLALI , Smail TERCHI , Bahri DEGHFEL , ABDELHAMID Guelil , Abdelhalim Zoukel, Ahmad Azmin Mohamad, , (2025-02-01), Synthesis of low-content Mn-doped ZnO thin films: Characterizations and density functional theory studies, Inorganic Chemistry Communications, Vol:172, Issue:172, pages:113710, Elsevier, Science Direct

This study aims to prepare manganese-doped zinc oxide (MZO) thin films with low Mn content (x = 0, 2, 4 %) using the sol–gel spin coating method and to characterize their structural, optical, and magnetic properties. Experimental techniques were complemented by Density Functional Theory calculations with Hubbard correction (DFT-LDA + U). All films exhibit a polycrystalline wurtzite hexagonal phase of ZnO. As the Mn doping increases, all diffraction peaks are getting weaker, which leads to deterioration in the crystallinity of the samples. Furthermore, Mn doping affects the grain size (57.44–38.20 nm), the surface morphology (rms: 45.24–30.47 nm), the transmittance (93–54 %) and the optical band gap energy (Eg: 3.27–3.18 eV). Photoluminescence spectra reveals ultraviolet peaks (386–395 nm) along with weak green (525 nm) and strong (438 nm) and weak (475 nm) blue peaks. DFT-LDA + U calculations exhibits an antiferromagnetic phase with slightly reduced Eg (3.379 eV for x = 0 % and 3.267 for 3.7 %), attributed to the influence of Mn3d states near the Fermi level. This study presents a comprehensive analysis of low-content Mn-doped ZnO thin films by combining experimental and theoretical approaches. The findings provide valuable insights into the electronic, structural, optical, and magnetic properties of MZO, emphasizing the critical role of Mn 3d states in altering the magnetic behavior and adjusting Eg.

Citation

ELHADJ Benrezgua , , (2024-12-03), Synthesis of low-content Mn-doped ZnO thin films: Characterizations and density functional theory studies, Inorganic Chemistry Communications, Vol:172, Issue:, pages:113710, Elhadj Benrezgua

The sol-gel spin coating method was effectively used to deposit nickel oxide (NiO) thin films onto glass substrates using nickel acetate tetrahydrate as a precursor. The films were prepared with different concentrations (0.2 M ,0.3 M and 0.4M) and annealed at 450°C for 1.5 hours in air. Structural analysis via X-ray diffraction (Fig.01) shown that all films exhibited crystallization in the cubic phase, with preferred orientation toward (200) plane a-plane, at the angle 43.3 °. The crystallite size increases when increasing the concentration . Similarly, other structural parameters of the nanoparticles such as dislocation density (δ), micro-strain (ε) and decreased with increasing molar concentration as shown in Table 1. The investigation of the absorption spectra on the UV-visible region shows that the transparency of the films decreases in the visible region. Using tauc’s method , the band gap energy was estimated. We observe a slightly wider band gap when increasing the concentration . Eg values varies from 3.72 eV to 3.83 eV. (Fig3).

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ELHADJ Benrezgua , ,(2024-11-13), Study of the Physical Properties of Nickel oxide Thin Films : Effect of Lower Molarity,1st International Seminar on Mechatronics Innovation Materials, Renewable Energy and Artificial Intelligence (ISMIMREAI’24),,Tipaza, Algeria

Water pollution is a major global challenge, causing severe repercussions for both the environment and human health. Adsorption using bio-adsorbents is a promising method for removing these pollutants. This study focuses on the valorization of date peels, an agricultural waste, by developing activated carbon from these residues. The activated carbon was characterized by zero charge point (pH_pzc) measurements and Fourier transform infrared spectroscopy (FTIR) analysis. A series of experiments was conducted to evaluate the impact of contact time, pH, dosage, and temperature on adsorption capacity and process kinetics. The integration of nanometric materials into the design of these bio-adsorbents could enhance their efficiency and broaden their applications in wastewater treatment. The exploration of these new adsorbents, which are sustainable, economical, and easily accessible, is a priority for researchers seeking innovative solutions in this field.

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ELHADJ Benrezgua , ,(2024-10-31), Yalorization of Agricultural Waste: Development of Bio­Adsorbents from Date Peels for Wastewater Treatment,AT THE 1st INTERNATIONAL CONFERENCE ON TECHNOLOGICAL APPLICATIOl\ OF MA ERIALS (ICTAM'24),Ferhat Abbas University Seti fl -Faculty of Technology

Water pollution is a major global challenge, causing severe repercussions for both the environment and human health. Adsorption using bio-adsorbents is a promising method for removing these pollutants. This study focuses on the valorization of date peels, an agricultural waste, by developing activated carbon from these residues. The activated carbon was characterized by zero charge point (pH_pzc) measurements and Fourier transform infrared spectroscopy (FTIR) analysis. A series of experiments was conducted to evaluate he impact of contact time, pH, dosage, and temperature on adsorption capacity and process kinetics. The integration of nanometric materials into the design of these bio-adsorbents could enhance their efficiency and broaden their applications in wastewater treatment. The exploration of these new adsorbents, which are sustainable, economical, and easily accessible, is a priority for researchers seeking innovative solutions in this field.

Citation

Lamya MEFTAH , Smail TERCHI , Bahri DEGHFEL , ELHADJ Benrezgua , ,(2024-10-31), valorization of Agricultural Waste: Development of Bio Adsorbents from Date Peels for Wastewater Treatment,r'1 INTERNATIONAL CONFERENCE ON TECHNOLOGICAL APPLICATIOl\ OF MA ERIALS (ICTAM'24),Sétif

Mn doped ZnO thin films (MZO) with varying doping levels (x) were prepared using the sol-gel spin coating method. All films exhibited a stable hexagonal polycrystalline wurtzite phase after doping. The surface morphology was slightly altered, with a decrease in grain size [1]. The transmittance of the films reduced, and the optical band gap energy (Eg) showed a slight decrease as Mn doping increased [2]. Additionally, the transparency of the films diminished due to oxygen vacancies and increased grain boundary density. The UV absorption edge shifted to longer wavelengths with higher Mn content, further reducing the band gap energy.

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ELHADJ Benrezgua , ,(2024-10-30), Mn doped ZnO films: A comparative structural and optical properties study.,AT THE 1STINTERNATIONAL CONFERENCE ON TECHNOLOGICAL APPLICATION OF MATERIALS (JCTAM'24),Ferhat Abbas University Seti fl -Faculty of Technology

Algerian natural phosphate minerals (N-PH) were processed through milling and subsequent heat treatment, followed by thorough characterization. The resulting powders and samples were analyzed using TG/DTA, XRD, FTIR, and FESEM techniques, with structural refinement carried out via the Rietveld method. FESEM analysis showed morphological changes from spherical to rod-like particles, attributed to sintering. Elemental analysis confirmed the formation of fluorapatite. Rietveld refinement quantified the FAP phase, showing 98.75% purity, and validated the hexagonal structure and arrangement of phosphate and calcium ions.

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ELHADJ Benrezgua , ,(2024-10-30), Rietveld refinement of natural phosphate using prof ex,AT THE 1ST INTERNATIONAL CONFERENCE ON TECHNOLOGICAL APPLICATION OF MATERIALS (JCTAM'24),Ferhat Abbas University Seti fl -Faculty of Technology

In this study, 7% manganese-doped zinc oxide (MZO) thin films with varying low thicknesses were synthesized using the spin coating method. The structural, optical, and morphological properties of MZO films with different film thickness, were systematically investigated. The crystallite structure, superficial morphology, and optical characteristics were analyzed using X-ray diffraction (XRD), atomic force microscopy (AFM), scanning electron microscopy (SEM), and ultraviolet–visible spectroscopy (UV-Vis). Structural analysis confirmed that all films exhibit a hexagonal wurtzite phase with a pronounced peak along the c-axis, and slight variation in low thickness significantly affected the structural parameters. The surface morphology demonstrated good uniformity, characterized by rounded grain shapes in the plane, while surface roughness was found to be increased with increasing film thickness. Optical analysis revealed that as the number of coatings increased, both transmittance and band gap energy decreased, accompanied by a redshift in the absorption edge across all samples. This behavior is attributed to light scattering, as well as an increase in the refractive index and dielectric function with visible light energy, influenced by the number of layers and corresponding crystallite size.

Citation

ELHADJ Benrezgua , , (2024-10-25), Low thickness effect on the properties of Mn-doped ZnO thin films synthesized by sol-gel spin coating technique, Studies in Engineering and Exact Sciences, Vol:5, Issue:2, pages:1-16, Elhadj Benrezgua

La pollution des eaux est l'un des problèmes les plus répandus à l'échelle mondiale, entraînant des conséquences néfastes pour l'environnement et la santé humaine. L'adsorption par des bio-adsorbants représente l'une des méthodes les plus efficaces pour éliminer ces polluants. Ce travail vise à valoriser les déchets agricoles, notamment les pelures d'amandes, en développant un charbon actif à partir de ces résidus. Notre adsorbant a été caractérisé à l'aide de mesures du point de charge nulle (pH_pzc) et d'une analyse par spectroscopie infrarouge à transformée de Fourier (IRTF). Une série d'expériences a été conduite afin d'étudier l'impact du temps de contact, du pH, de la dose et de la température sur la capacité d'adsorption ainsi que sur la cinétique du processus. L'exploration de nouveaux adsorbants, naturellement abondants, faciles à collecter, économiques et disponibles en permanence, constitue un objectif majeur pour de nombreux chercheurs dans ce domaine.

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Lamya MEFTAH , Smail TERCHI , Bahri DEGHFEL , ELHADJ Benrezgua , ,(2024-10-14), Valorisation des pelures d'amandes en charbon actif pour l'épuration des eaux usées : Caractérisation et étude des capacités adsorbantes,1er Séminaire National : Eau, Environnement et Energies Renouvelables (SN3ER’2024),M'sila

Dans cette étude, nous avons utilisé la vermiculite sodique comme adsorbant d’un colorant azoique. Le polluant étudié c’est l’acide rouge ; plusieurs paramètres d’adsorption telle que le pH de la solution, temps de contact, dose d’adsorbant, concentration initiale du colorant, la salinité ont été étudiés. Les résultats de cette étude montre que le milieu acide est favorise mieux l’adsorption du colorant. L’étude cinétique montre que l’adsorption est rapide ou se déroule ou bout d’une heure le système adsorbant-colorant atteint à l’équilibre. La dose optimale d’adsorbant est de 0,05g dans 50 ml de solution. D’après les modélisations de isotherme d’adsorption le modèle Freundlich est le plus approprié. Ces résultats sont comparés avec une matériau hybride; St/argile . L’ étude cinétique montre que l’adsorption est rapide ou se déroule ou bout d’une heure le système adsorbant-colorant atteint à l’équilibre. La dose optimale d’adsorbant est de 0,05g dans 25 ml de solution. D’après les modélisations de isotherme d’adsorption le modèle Freundlich est le plus approprié..

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ELHADJ Benrezgua , Bureau de la stratégie de numérisation , Bureau de la stratégie de numérisation , ,(2024-10-13), Dans cette étude, nous avons utilisé la vermiculite sodique comme adsorbant d’un colorant azoique. Le polluant étudié c’est l’acide rouge ; plusieurs paramètres d’adsorption telle que le pH de la solution, temps de contact, dose d’adsorbant, concentration,1er Seminaire National : Eau, Environnement et Energies renouvelables,Université Mohamed Boudiaf deM’Sila,

The sol-gel spin coating method was effectively utilized to deposit nickel oxide (NiO) thin films onto glass substrates using nickel acetate tetrahydrate as a precursor. The films were prepared with different concentrations (0.7 M and 0.8 M) and annealed at 450°C for 1.5 hours in air. Structural analysis via X-ray diffraction (Fig.01) shown that all films exhibited crystallization in the cubic phase, with preferred orientation at (200) plane, to angles of 43.3°. The crystallite size decreased with 0.8 M compared to 0.7 M. However, the transparency of the films decreased in the visible region. The band gap energy is 3.72 eV for 0.7 M and 3.8 eV for 0.8 M (Fig3).

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ELHADJ Benrezgua , ,(2024-05-06), Structural and Optical Properties of NiO Thin Films prepared by Sol-Gel Spin Coating Méthode : Effect of Precursor Concentration,Le 2ème colloque national de chimie (CNC2@2024),Université Mohamed Boudiaf - M’sila

This study investigates copper oxide thin films synthesized via the sol-gel method and deposited onto glass substrates using spin coating. The aim was to enhance their properties for photovoltaic applications through optimization of annealing temperature and precursor solution molar concentration. We examined the effects of annealing temperature on the structural and optical properties [1, 2] of the films. Notably, films treated at 450°C exhibited increased absorbance. Subsequently, employing this optimized temperature, CuO thin films of varying molar concentrations were deposited under the same conditions. Structural analysis via X-ray diffraction revealed a polycrystalline nature with a monoclinic crystal structure for all samples. Optical characterization using UV-Visible-NIR spectrophotometry indicated high absorbance in the visible region for the films.

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Djamel ALLALI , Rabie AMARI , AMMAR Boukhari , ELHADJ Benrezgua , Chouia Rabah, ,(2024-05-06), Study of Structural and Optical Properties of Copper Oxide Thin Films Prepared by Sol–Gel Spin–Coating Method,Le 2ème colloque national de chimie (CNC2@2024) 6 - 7 mai 2024,Msila

Pure and Mn-doped zinc oxide thin films at contents x =7% were synthesized by sol–gel spin coating process and investigated using various techniques. both samples have a wurtzite hexagonal phase, which wasn’t altered and getting relaxed by Mn-doping (Fig.1). The grain size decreased with 7% Mn doping (Table 1) while maintaining its growth mode The intensity of the (002) diffraction peak surpasses that of the other peaks, suggesting a preferential growth orientation along the c-axis owing to its minimal surface free energy among the (002) planes[1, 2], in addition, the results indicate a deterioration in the crystallinity of the ZnO film due to Mn incorporation". From fig.2 the transparency of films was decreased in the visible region and the average transmittance of MnxZnO1-x films with Mn doping content x=0, and 7 %, are 93 and 54% in the visible range, respectively. The Eg values of MZO films (fig.3) with Mn doping content x=0.00, and 0.07, are 3.27, and 3.18 eV, respectively. illustrates the PL spectra of ZnO and MZO thin films (Fig.4), at the excitation wavelength of 386 nm (3.21 eV). Several emission bands, including one violet emission (defect) at 411 nm (~3.01 eV), two blue emissions at 438/475 nm

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ELHADJ Benrezgua , Bureau de la stratégie de numérisation , ,(2024-02-13), Exploring The Structural, Optical, and Photoluminescence properties of Mn1-xZnOx Thin Films Deposited by Sol-Gel Spin Coating Technique,THE “2 ND NATIONAL CONFERENCE ON MATERIALS, ENERGY & ENVIRONMENT “,BISKRA, ALGERIA.

Pure and Mn-doped zinc oxide thin films at contents x =7% were synthesized by sol–gel spin coating process and investigated using various techniques. both samples have a wurtzite hexagonal phase, which wasn’t altered and getting relaxed by Mn-doping (Fig.1). The grain size decreased with 7% Mn doping (Table 1) while maintaining its growth mode The intensity of the (002) diffraction peak surpasses that of the other peaks, suggesting a preferential growth orientation along the c-axis owing to its minimal surface free energy among the (002) planes[1, 2], in addition, the results indicate a deterioration in the crystallinity of the ZnO film due to Mn incorporation". From fig.2 the transparency of films was decreased in the visible region and the average transmittance of MnxZnO1-x films with Mn doping content x=0, and 7 %, are 93 and 54% in the visible range, respectively. The Eg values of MZO films (fig.3) with Mn doping content x=0.00, and 0.07, are 3.27, and 3.18 eV, respectively. illustrates the PL spectra of ZnO and MZO thin films (Fig.4), at the excitation wavelength of 386 nm (3.21 eV). Several emission bands, including one violet emission (defect) at 411 nm (~3.01 eV), two blue emissions at 438/475 nm

Citation

ELHADJ Benrezgua , ,(2024-02-13), Exploring The Structural, Optical, and Photoluminescence properties of Mn1-xZnOx Thin Films Deposited by Sol-Gel Spin Coating Technique,THE “2 ND NATIONAL CONFERENCE ON MATERIALS, ENERGY & ENVIRONMENT,Tipaza, Algeria

Pure and Mn-doped zinc oxide thin films at contents x =10% were synthesized by sol–gel spin coating process and investigated using various techniques. both samples have wurtzite hexagonal phase, which wasn’t altered and getting relaxed by Mn-doping. The grain size decreased and did not change its growth mode in 10%Mn doping. at x= 10 %, the transparency of films was decreased in the visible region and the band gap energy (Eg) presented a slight shrinking. Photoluminescence spectra showed ultraviolet with strong and weak blue and weak green emission peaks.

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ELHADJ Benrezgua , ,(2023-12-20), Structural. optical and photoluminescence Properties of pure ZnO and :Mn-Doped ZnO Thin Films Grown by Sol-Gel Spin Coating Deposition.,THE FIRST NATIONAL CONFERENCE ON MATTER SCIENCES 􀀁cs,11023 (PresenLal and onJine) 20 DECEMBER 2023 DJELFA-ALGERIA,Djelfa

The study successfully produced ZnO and ZnO nanoparticles doped with transition metals (TMZO-NPs) using the co-precipitation method. Various properties of these nanoparticles were examined, including their structure, morphology, electronic behavior, optical characteristics, vibrations, and photocatalytic abilities. The analysis confirmed that all nanoparticles possessed a hexagonal wurtzite crystalline structure, with particle size being influenced by the presence of transition metals (Al, Ag, Cu, Mn). The particles exhibited a preference for orientation along the (002) axis. The shift in peak positions towards higher angles suggested that the TM might replace Zn ions in the ZnO lattice. The surface structure of the nanoparticles displayed a combination of spherical and hexagonal shapes. Further analysis identified important bands related to the stretching modes of TM-O and Zn–O bonds. The absorption properties and edges were also affected by the presence of TM. In the degradation study, both pure ZnO and TMZO-NPs were tested for their ability to break down methylene blue (MB) under UV light exposure for 90 min. Among the nanoparticles, Al-doped ZnO (AlZO-NPs) demonstrated the highest degradation efficiency, achieving 97.14% removal of MB within the given exposure time. The photocatalytic process followed a pseudo-first-order kinetics, indicating a strong correlation. This suggests that AlZO-NPs hold promise as a material for use in photocatalytic applications.

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ELHADJ Benrezgua , , (2023-11-24), Coprecipitation synthesis of transition metal (Al, Mn, Cu, Ag) doped zinc oxide nanopowders: characterization, photocatalytic test, and comparison study, Journal of the Australian Ceramic Society, Vol:60, Issue:, pages:653–662, Rabie Amari

In the present study, transition metal Al-doped ZnO nanoparticles (TM-ZN NPs) were synthesized via the chemical co-precipitation method. The structural, morphological, electronic, optical, vibrational as well as the photocatalytic properties of the elaborated TMZO-NPs, are then investigated. Hexagonal wurtzite crystallinity of all elaborated NPs is confirmed by the phase analysis and particle size is found to be affected by TM doping. XRD peak shows that all samples prefer orientation along (002) axis and TM (Al) may substitute ZnO structure as the peaks shift toward higher angles. The surface morphology of all samples exhibits mixture of spheroid-like and hexagon-like shaped structures. FTIR analyses are carried out to identify the important bands attributed to TM-O and Zn-O stretching vibration modes. The absorption intensity and edge are found affected by adding TM dopant. Degradation by pure ZnO and TMZO NPs of the methylene blue is investigated after 90 min UV light exposure. TM dopant affects the degradation of MB dye, where a high percentage (97.14%) being achieved after reasonable time of exposure (90 min) under UV light for Aluminum doped ZnO nanoparticles (AlZO NPs).

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Rabie AMARI , ELHADJ Benrezgua , Bahri DEGHFEL , AMMAR Boukhari , Djamel ALLALI , Siassi A, ,(2023-08-16), Studies on photocatalytic performance applications of undoped and Al-doped ZnO nanoparticles,NANO-2023,Bukovel, UKRAINE