ELHADJ Benrezgua
الحاج بن رزقة
elhadj.benrezgua@univ-msila.dz
0698468728
- Departement of Nature and life sciences
- Faculty of Sciences
- Grade MCB
About Me
Location
Msila, Msila
Msila, ALGERIA
Code RFIDE- 1993-02-19 00:00:00
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ELHADJ Benrezgua birthday
- 2023-08-16
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2023-08-16
Studies on photocatalytic performance applications of undoped and Al-doped ZnO nanoparticles
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).
Citation
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
- 2022
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2022
Ni doping effect on the electronic, structural and optical properties of ZnO nanoparticles prepared by Co-precipitation route
Nanoparticles (NPs) synthesized by the co-precipitation technique show many attractive properties such as small particle size, high crystallinity, high average pore diameter and high specific surface area. However, numerous reports show that some characteristics of the Ni-doped ZnO (NZO) NPs remain controversial such as optical bandgap (Eg), surface morphology and defect level. In this study, pure ZnO and NZO NPs at different Ni contents (x) were successfully prepared using the co-precipitation method. Phase analysis confirms the hexagonal wurtzite crystallinity of the samples. XRD peak shows that the Ni may substituted ZnO structure as the peaks shift toward higher angles with increasing x. Meanwhile, the formation of NiO secondary phases was significant at 12.50% Ni content. Densely packed spherical shaped structures with nanoparticle agglomeration are observed at low x, while some nanorod shaped structures appear at higher x. The stretching vibrations of the Zn–O bond are observed in the NZO NPs. The absorption edge shifts to higher wavelengths with the increase in x. This study provides consistent results in the phase analysis, morphology and structural parameters. The decrease in Eg agrees with the photoluminescence measurements. The emission spectra confirm the presence of interstitial zinc and singly ionized oxygen vacancies.
Citation
Rabie AMARI , ELHADJ Benrezgua , Bahri DEGHFEL , AMMAR Boukhari , Zoukel Abdelhalim, Mohamad kamil Yaakob, wan Jeffrey bassirun, Soorathep Kheawhom, Ahmad Azmin Mohamad, , (2022), Ni doping effect on the electronic, structural and optical properties of ZnO nanoparticles prepared by Co-precipitation route, Optical Materials, Vol:128, Issue:, pages:112398, Elsevier
- 2022
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2022
Synthesis and properties of copper doped zinc oxide thin films by sol-gel, spin coating and dipping: A characterization review
Numerous studies on Cu-doped ZnO (CZO) thin film doped as a p-type material have been reported due to its applications in optoelectronic and gas sensing devices. The synthesis and fabrication of CZO thin films by various techniques have been reported, but the sol-gel technique for both spin and dip coating has attracted much attention due to its safety, low cost and simple deposition equipment on a large surface-area. Motivated by the fact that reviews on CZO thin films have not been reported yet, this review summarizes the main chemical processes used in the fabrication of CZO thin films with special focus on the sol-gel synthesis involving several chemical and physical parameters such as solvent, additive, solution stirring and aging time, substrate and coating method which includes both dip and spin coating. It also highlights the various parameters influencing the structural, morphological, electronic, optical, vibrational and magnetic properties of the CZO thin films. For this purpose, a summary of various parameters of CZO thin films, reported in the literature survey of the past ten years (2010–2020), is tabulated and discussed. The influence of Cu doping on the synthesis and properties of CZO thin films is also reviewed. The structural, electronic, optical, magnetic and vibrational properties, as well as the elemental composition and surface morphology of the CZO thin films are also discussed. At the end of this review, an outlook is presented to gain more insights into the combined effects of the method-preparation-dopant combination on the properties of CZO thin films for future potential applications. This review should be a useful benchmark for researchers to explore the various physicochemical properties of CZO, their dependence on the experimental conditions and applications.
Citation
ELHADJ Benrezgua , Bahri DEGHFEL , Rabie AMARI , AMMAR Boukhari , Zoukel Abdelhalim, Wan Jeffrey Basirun, Muhamad Kamil Yaakob, Soorathep kheawhom, Ahmad Azmin Mohamad, , (2022), Synthesis and properties of copper doped zinc oxide thin films by sol-gel, spin coating and dipping: A characterization review, Journal of Molecular Structure, Vol:1267, Issue:, pages:133639, Elsevier
- 2022
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2022
A Review on DFT+ U Scheme for Structural, Electronic, Optical and Magnetic Properties of Copper Doped ZnO Wurtzite Structure
Some efforts have been made on Cu-doped ZnO (CZO) structures to study the electronic, structural, magnetic and optical properties from first-principles calculations by different computer codes. This is very interesting to review in detail about CZO structures. A summary of the convergence criteria of geometry optimization for CZO structures from the literature survey (2010–2021) is tabulated and discussed. The impact of the Hubbard-U scheme in the exchange-correlation functional on the standard Density Functional Theory (DFT) miscalculation for CZO properties is comprehensively reviewed. The inclusion of Ud-Zn, Ud-Cu and Up-O all to gather leads to a correct energy band gap, and exhibits a slight effect on the lattice constant. The values of Ud-Zn, Ud-Cu and Up-O have a considerable impact on the intensity and position of the main peaks of the imaginary part. The magnetic phase of the CZO structure is found to be influenced by both Ud,Zn and Ud,Cu. More attention is paid to the influence of Cu doping content on CZO properties, including electronic, structural, optical and magnetic properties. The magnetic moment mainly comes from Cu ions with little contribution from O ions. Ferromagnetic (FM) spin ordering of Cu ions are suggested to be mediated by the holes induced in p-d hybridization. Finally, some perspectives for future studies are discussed as well.
Citation
ELHADJ Benrezgua , Bahri DEGHFEL , AMMAR Boukhari , Rabie AMARI , Abdelhalim Zoukel, Soorathep kheawhom, Ahmad Azmin Mohamad, , (2022), A Review on DFT+ U Scheme for Structural, Electronic, Optical and Magnetic Properties of Copper Doped ZnO Wurtzite Structure, Materials Today Communication, Vol:31, Issue:, pages:103306, Elsevier
- 2022
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2022
Structural, morphological and optical properties of Cu-doped ZnO thin films prepared by sol-gel spin coating method
In this work, 8.5% Cu-doped ZnO thin film was fabricated on glass substrate using sol–gel spin coating method, in order to investigate the structural, optical and morphological properties. XRD result exhibited that the deposited thin film has a hexagonal wurtzite structure with a preferential orientation along the (0 0 2) c-axis orientation. The grain size, lattice constants, FWHM and strain of the film were calculated. To characterize the electronic and optical properties, UV-Vis spectra were used. The results indicate that the average transmittance is 74.68% in the visible range. The optical band gap energy was found to be 3.317 eV. The surface morphology showed a mixer of spheroid-like and rod-like nanoparticles (granules) randomly distributed.
Citation
AMMAR Boukhari , ELHADJ Benrezgua , Rabie AMARI , Djamel ALLALI , Bahri DEGHFEL , ,(2022), Structural, morphological and optical properties of Cu-doped ZnO thin films prepared by sol-gel spin coating method,1st international conference on chemical matters and environment preservation IC-CMEP’22,Ouargla, Algeria
- 2022
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2022
Studies on structural, morphological, optical, luminescence and electronic properties of Ni-doped ZnO nanopowder by co-precipitation method
In this work, pure and Ni-doped ZnO nanoparticles (NPs) with concentration of Ni (6.25%) were successfully prepared by using co-precipitation method [1]. Among TM, nickel is very significant element which has a similar ionic radius as that of Zn. Literature studies show that Ni doping into ZnO matrix can enhance its various properties [2, 3]. Zinc acetate dihydrate [Zn (CH3COO)2 2H2O], nickel acetate dihydrate [Ni (CH3COO)2 2H2O] and sodium hydroxide solution [NaOH] were used as precursors. For getting homogeneous solution, stoichiometric amount of zinc and nickel acetate were dissolved in methanol, after stirred continuously on a magnetic stirrer at room temperature. For raising the pH of the obtained solution to ~9, small amount of sodium hydroxide solution [NaOH] was added drop by drop. The precursor solution is then stirred again until the liquid solution turns into a gel. After gel formation, the beaker was transferred on the hot plate at 500°C for 1h. The obtained sample yield in the form of loose powder was then finely grounded by agate mortar and pestle. The prepared samples in powder form were characterized by X-ray diffraction spectroscopy (XRD), Scanning Electron Microscopy (SEM), Ultraviolet–visible spectroscopy (UV-Vis), Photoluminescence (PL) and Fourier transform infrared spectroscopy (FTIR). The obtained results have been discussed and compared with those from other sources whatever possible.
Citation
Rabie AMARI , ELHADJ Benrezgua , Bahri DEGHFEL , AMMAR Boukhari , ,(2022), Studies on structural, morphological, optical, luminescence and electronic properties of Ni-doped ZnO nanopowder by co-precipitation method,1st international conference on chemical matters and environment preservation IC-CMEP’22,Ouargla, Algeria
- 2022
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2022
Structural, electronic, optical and elastic properties of pure ZnO material using first-principles calculation
The first-principles method based on DFT with semiempirical Hubbard U scheme was applied to calculate the structural, elastic, electronic, and optical properties of ZnO wurtzite material. The effective Hubbard U values of 5.5 eV and 8 eV were used for Zn 3d and O 2p states, respectively. Electronic band structures and their corresponding total and partial density of states diagram were calculated. The optimized lattice parameters were a=b= 3,234 Å and c= 5,201 Å. The elastic stiffness constants of ZnO crystals were estimated from the optimized structure. The obtained band gap was found 3.38 eV. The frequency-dependent complex dielectric function, absorption coefficient, refractive index, extinction coefficient, reflectivity and electron energy loss function spectra were also calculated and discussed.
Citation
AMMAR Boukhari , Rabie AMARI , ELHADJ Benrezgua , Bahri DEGHFEL , ,(2022), Structural, electronic, optical and elastic properties of pure ZnO material using first-principles calculation,The first national Seminar on Green Chemistry and Natural Products (GCNP’22),University of Echahid Hamma Lakhdar, El-Oued
- 2022
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2022
Structural, electronic, morphological and luminescence properties of 10% Mn-Doped ZnO Thin Films
The present work studied the structural and luminescence properties of 10% Mn-doped ZnO thin film fabricated on glass substrate using sol–gel spin coating method. XRD result exhibited that the deposited thin film has a hexagonal wurtzite structure with a preferential orientation along the (0 0 2) c-axis orientation. The grain size, lattice constants, FWHM and strain of the film were calculated. To characterize the electronic and optical properties, UV-Vis spectra were used. The results indicate that the average transmittance is 55% in the visible range. The optical band gap energy was found to be 3.19 eV. The surface morphology showed a mixer of spheroid-like and rod-like nanoparticles (granules) randomly distributed. Photoluminescence (PL) spectra shows several emission bands, including one violet emission (defect) at 411 nm (~3.01 eV), two blue emissions at 438/475 nm (~2.83/~2.61 eV), and weak green emission at 525 nm (~2.36 eV).
Citation
ELHADJ Benrezgua , Rabie AMARI , AMMAR Boukhari , Bahri DEGHFEL , ,(2022), Structural, electronic, morphological and luminescence properties of 10% Mn-Doped ZnO Thin Films,The first national Seminar on Green Chemistry and Natural Products (GCNP’22),University of Echahid Hamma Lakhdar, El-Oued
- 2022
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2022
Structural, Optical and Morphological properties of 10.8% Cu-Doped ZnO Thin Films
In this study, 10.8% Cu-doped ZnO thin film was deposited on glass substrate using sol–gel spin coating technique, in order to investigate the structural, optical and morphological properties. XRD result exhibited that the deposited thin film has a hexagonal wurtzite structure with a preferential orientation along the (0 0 2) c-axis orientation. The grain size, lattice constants, FWHM and strain of the film were calculated. To characterize the electronic and optical properties, UV-Vis spectra were used. The results indicate that the average transmittance is 80% in the visible range. The optical band gap energy was found to be 3.25 eV. The surface morphology showed a mixer of spheroid-like and rod-like nanoparticles (granules) randomly distributed.
Citation
Rabie AMARI , ELHADJ Benrezgua , AMMAR Boukhari , Bahri DEGHFEL , ,(2022), Structural, Optical and Morphological properties of 10.8% Cu-Doped ZnO Thin Films,The first national Seminar on Green Chemistry and Natural Products (GCNP’22),University of Echahid Hamma Lakhdar, El-Oued
- 2022
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2022
Experimental and first principles study of structural, electronic and optical properties of Zn0.875Mn0.125O nanoparticles by co-precipitation method
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Citation
Rabie AMARI , Djamel ALLALI , Bahri DEGHFEL , ELHADJ Benrezgua , AMMAR Boukhari , ,(2022), Experimental and first principles study of structural, electronic and optical properties of Zn0.875Mn0.125O nanoparticles by co-precipitation method,10th International Conference on Materials Sciences And Technology, (MatScience-2022),khenchela, Algeria
- 2022
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2022
Effect of high Ni Doping on the properties of ZnO Nanopowders
Pure and Ni-doped ZnO nanoparticles (NPs) with concentration of Ni (12.5%) were successfully prepared by using co-precipitation method [1]. Among TM, nickel is very significant element which has a similar ionic radius as that of Zn. Literature studies show that Ni doping into ZnO matrix can enhance its various properties [2, 3]. The prepared samples in powder form were characterized by X-ray diffraction spectroscopy (XRD), Scanning Electron Microscopy (SEM), Ultraviolet–visible spectroscopy (UV-Vis), Photoluminescence (PL) and Fourier transform infrared spectroscopy (FTIR). The obtained results have been discussed and compared with those from other sources whatever possible.
Citation
Rabie AMARI , ELHADJ Benrezgua , Djamel ALLALI , Bahri DEGHFEL , AMMAR Boukhari , ,(2022), Effect of high Ni Doping on the properties of ZnO Nanopowders,10th International Conference “Nanotechnologies and Nanomaterials” (NANO-2022),Lviv. Ukraine