M. MAHROUG Abdelhafid

Prof

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Department

BASE COMMON ST Departement ST

Research Interests

- Nanotechnology and Nanoscience - Thin films: Elaboration, characterization and applications - Metal Oxides Semiconductors - Materials for Energy Storage and Conversion

Contact Info

University of M'Sila, Algeria

Email : abdelhafid.mahroug@univ-msila.dz

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Recent Publications

2024-07-19

Modeling of soil consolidation around tunnels- Case study of Algiers Metro

This work primarily passes through both a numerical modeling of soil consolidation, analysis with a geotechnical definition that follows up the modeling of soil consolidation around tunnels, based on a real case (Algiers Subway), as well as the effects of shallow tunneling on a multistage structure placed above the tunnel axis. That study has, thus, been conducted with reference to the geotechnical software, which is based on the former method in plane strain, while the excavation was done according to the New Austrian Tunneling Method by taking into consideration the déconfinement.
Keywords – Consolidation, soil, Tunnel, Modeling, settlement, PLAXIS 8.2, the Algiers Metro
Citation

M. MAHROUG Abdelhafid, (2024-07-19), "Modeling of soil consolidation around tunnels- Case study of Algiers Metro", [international] International Conference on Scientific and Academic Research , Konya turkey

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2024-06-15

Iron doped Zinc Oxide: optical and structural properties

Iron doped ZnO films were deposited by thermal oxidation of sputtered metallic zinc, zinc and iron. The effect of iron (Fe) doping on optical, morphology and structural properties of zinc oxide thin films was investigated. The results of XRD, AFM and the photoluminescence (PL) analyze show that Fe doping could markedly influence the ZnO properties where Fe-doped ZnO films exhibited the best properties. Therefore such films can be usefully used in different device applications
Citation

M. MAHROUG Abdelhafid, (2024-06-15), "Iron doped Zinc Oxide: optical and structural properties", [international] 3rd International Conference on Frontiers in Academic Research , Konya turkey

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2024-03-12

Mechanical properties of rapidly solidified aluminum-copper alloys

The present work consists of the development and characterization of the rapidly solidified Al-Cu alloy, using the SR “melt-spinning” method. The ribbons have a thickness which varies between 60μm and 70μm, a width of approximately 3mm and a length which can reach up to 60cm. Bending tests show that the ductility of all the ribbons is very high. The XRD characterization of the ribbons clearly shows the existence of the supersaturated solid solution α (Al) alone. Microhardness measurements showed the hardness of the ribbons obtained to be greater than those of the alloys obtained by ordinary solidification, these increases in hardness are the result of obtaining a very fine structure or of changing the morphology of the grain growth between the SO and SR cases..
Citation

M. MAHROUG Abdelhafid, (2024-03-12), "Mechanical properties of rapidly solidified aluminum-copper alloys", [international] 4th International Conference on Innovative Academic Studies (ICIAS) , Konya turkey

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The elastic properties of ZnO: effect of size, surface orientation, film thickness and doping

In this work, we studied the elastic properties of the manganese doped ZnO films. Mn-doped Zinc oxide (ZnO) films were synthesized on glass substrates by the sol–gel spin coating technique. The films have preferred orientation along the c-axis of hexagonal wurtzite structure. The results show strong dependence between the elastic properties and size, surface orientation, film thickness and manganese doping. Reduction of grain size and surface roughness is observed with the increase of doping concentration. Manganese doping causes an increase in the strain and compressive stress. The Young’s modulus of film is higher than that of bulk, and it increases with the doping concentration and with decreasing of film thickness.
Citation

M. MAHROUG Abdelhafid, (2024-03-12), "The elastic properties of ZnO: effect of size, surface orientation, film thickness and doping", [international] 4th International Conference on Innovative Academic Studies ICIAS 2024 , Konya turkey

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2023-12-02

Copper oxide/zinc oxide nanocomposites thin films: elaboration and their photodegradation properties

The photocatalytic process is used to remove organic contaminants. The present study investigates the photocatalytic degradation of methylene blue by sol-gel-synthesized
CuO/ZnO nanocomposites thin films with different CuO content. CuO/ZnO nanostructures thin films were characterized by X-ray diffraction (XRD), PL and UV–vis spectroscopies and photodegradation test. XRD results confirmed the presence of CuO and ZnO phases in the nanostructure thin films. By incorporation of the CuO compound, the gap energy of ZnO decreased, PL intensity reduced, and the absorption of films in the visible was enhanced. ZnO/CuO nanocomposites thin films exhibit an excellent performance of photocatalytic activity.
Citation

M. MAHROUG Abdelhafid, (2023-12-02), "Copper oxide/zinc oxide nanocomposites thin films: elaboration and their photodegradation properties", [national] THE 1 ST NATIONAL CONFERENCE ON PHYSICS AND IT’S APPLICATIONS , BOUSAADA

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2023-09-23

Characterization and photocatalytic activity of Sol Gel copper oxide/zinc oxide nanocomposites thin films

CuO/ZnO nanostructures thin films were characterized by X-ray diffraction (XRD), PL and UV–vis spectroscopies and photodegradation test. XRD results confirmed the presence of CuO and ZnO phases in the nanostructure thin films. By incorporation of the CuO compound, the gap energy of ZnO decreased, PL intensity reduced, and the absorption of films in the visible was enhanced. ZnO/CuO nanocomposites thin films exhibit an excellent performance of photocatalytic activity
Citation

M. MAHROUG Abdelhafid, (2023-09-23), "Characterization and photocatalytic activity of Sol Gel copper oxide/zinc oxide nanocomposites thin films", [international] 3rd International Conference on Innovative Academic Studies , Konya/Turkey

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2023-06-16

Optical, luminescence, photocurrent and structural properties of sol-gel ZnO fibrous structure thin films for optoelectronic applications: A combined experimental and DFT study

Zinc oxide is an important oxide semiconductor, with excellent physical and chemical properties that are used in
different applications fields. In this research paper, ZnO thin films were synthesized using different types of
solvent by sol-gel spin coating technique. The effect of solvent on the structural, morphological, photocurrent
and optical properties of the films has been studied. X-ray diffraction revealed the high crystallinity of films in
the wurtzite structure with a c-axis preferred orientation. SEM micrographs revealed that all films exhibit a
fibrous structure, where the more homogeneous and dense surfaces were observed for ZnO-2-PrOH and ZnO–
EtOH films. The optical properties analysis shows that the films have high transparency. Different structural and
optical parameters were influenced by the type of solvent, where ZnO-2-PrOH film displays an improvement in
structural and optical properties. The photoluminescence PL spectrum revealed three emissions, two green
emissions and a UV emission at 390 nm. ZnO-2-PrOH film exhibits a high intensity ratio of UV to visible (IUV/
Ivis), a best UV response, and photocurrent properties. Finally, structural and optical parameters were also
calculated by first-principles DFT calculations, discussed, and compared to those experimental.
Citation

M. MAHROUG Abdelhafid, (2023-06-16), "Optical, luminescence, photocurrent and structural properties of sol-gel ZnO fibrous structure thin films for optoelectronic applications: A combined experimental and DFT study", [national] Optical Materials , Elsevier

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2023-06-12

polycopié Mécanique des fluides

polycopié Mécanique des fluides
Citation

M. MAHROUG Abdelhafid, (2023-06-12), "polycopié Mécanique des fluides", [national] m'sila university

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2023-04-10

polycopié Mécanique du point materiel

polycopié Mécanique du point materiel
Citation

M. MAHROUG Abdelhafid, (2023-04-10), "polycopié Mécanique du point materiel", [national] m'sila university

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2023-03-24

Optical, Photocurrent, Electrical, Structural, and Morphological Properties of Magnetron Sputtered Pure and Iron-Doped Zinc Oxide Thin Films

Due to its excellent physical and chemical properties, transition metal-doped zinc oxide has potential applications in different
fields. In this research paper, pure and iron-doped ZnO films were deposited by thermal oxidation of sputtered metallic zinc and
iron. The effect of iron (Fe) doping on the optical, morphology, structural, electrical, and photocurrent properties of zinc oxide
films was examined. The X-ray diffraction analysis shows a wurtzite structure with preferential orientation for all films, where the
high texture coefficient values (above 3) corresponded to the (002) plane. Fe doping reduced the crystallite size from 12.3 to 8.7 nm
and lattice constants c and a values from 5.19 to 5.155 Å and from 3.236 to 3.203 Å respectively. The different calculated structure
parameters, confirm the incorporation of Fe (Fe3+) in the ZnO lattice. The surface morphology of thin films measured using atomic
force microscopy revealed that the Fe doping could markedly decrease the grains size from 248 to 54 nm and the
Root–Mean–Square roughness of films from 5.27 to 4.22 nm. For all films, the transmittance analysis shows a transmittance
above 90% in the visible region and with an increase in the Fe concentration, the transmittance, and the absorption in the ultraviolet
region were increased. The gap energy of ZnO strongly increased from 3.26 to 3.51 eV with doping. The effect of Fe doping on
different optical parameters was discussed in detail. The photoluminescence analysis of pure and doped ZnO exhibits one
ultraviolet emission (384 nm) and green emission. Compared to pure ZnO, the ultraviolet peak intensity decreased as Fe content
increased. The electrical resistivity was decreased and the photocurrent properties of ZnO were enhanced by Fe doping. In this
report, Fe-doped ZnO films exhibited remarkable properties. Therefore such films can be usefully used in different device
applications.
Citation

M. MAHROUG Abdelhafid, (2023-03-24), "Optical, Photocurrent, Electrical, Structural, and Morphological Properties of Magnetron Sputtered Pure and Iron-Doped Zinc Oxide Thin Films", [national] ECS Journal of Solid State Science and Technology , iopscience

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2022

Sol gel of Al doped ZnO thin films: preparation and characterization

High quality of Al doped ZnO thin films were prepared using a sol–gel spin coating method. The result of XRD indicates that the film is polycrystalline hexagonal wurtzite structure with good crystallinity. Small grains in the film were observed in AFM image with average grains size of 52nm and surface roughness of 7nm. The film has an average transmittance above 95% in the visible region and optical band gap energy of 3.29eV. The photocurrent measurement result indicates the better photocurrent properties of film.
Citation

M. MAHROUG Abdelhafid, (2022), "Sol gel of Al doped ZnO thin films: preparation and characterization", [international] 3rd International Conference on Applied Engineering and Natural Sciences , Konya, Turkey

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Elaboration and characterization of Zinc Oxide thin films by sol-gel spin coating technique

In this work, ZnO thin films have been deposited on glass substrates by sol–gel spin coating method. Zinc acetate dihydrate, isopropanol and monoethanolamine (MEA) were used as a precursor, solvent and stabilizer, respectively. In order to study the effect of molarity on structural and optical properties, different solutions of 0.5, 1, 1.2, 1.5M have been prepared. The X-ray diffraction shows the high crystallinity of all films with the preferred orientation. The optical measurements by UV-Vis confirmed that our films exhibit transparent semiconductor properties to visible light. Increase the molarity leads to the decrease in transmittance and the value of the bandgap.
Citation

M. MAHROUG Abdelhafid, (2022), "Elaboration and characterization of Zinc Oxide thin films by sol-gel spin coating technique", [international] 1st International Conference on Innovative Academic Studies , Konya, Turkey

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Experimental and DFT study of structural and optical properties of Ni-doped ZnO nanofiber thin films for optoelectronic applications

As an important metal oxide semiconductor, transition metal-doped zinc oxide (ZnO) has attracted great interest
for various applications in optoelectronic, spintronic photovoltaic and photodetectors due to its significant
chemical and physical properties. In this research study, pure and nickel (Ni)-doped ZnO nanostructured films
were synthesized via the sol-gel method using the spin coating technique on glass substrates. The structural
results revealed that all samples exhibited a polycrystalline wurtzite structure and a (002) plane preferred
orientation. The crystallite size was reduced by Ni doping. The morphology micrographs indicate that the surface
of thin films shows nanofiber structures. An optical study revealed the high transparency of the films. The
photoluminescence (PL) showed one ultraviolet (UV) emission at 387 nm and different defect emissions for all
films. The absorption, band gap and PL emissions intensities were influenced by Ni doping. Ni-doped ZnO
nanostructured thin films revealed high UV sensitivity and photoresponse. Therefore, these thin films are a
promising material for a UV photodetector. The dielectric function, absorption coefficient and energy band gap
were also calculated and discussed by density functional theory (DFT), using the Ultra Soft Pseudo Potential (USPP)
approach implemented in the CASTEP code.
Citation

M. MAHROUG Abdelhafid, (2022), "Experimental and DFT study of structural and optical properties of Ni-doped ZnO nanofiber thin films for optoelectronic applications", [national] optical materials , elsevier

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2021

Structural, morphological and optical properties of Mn-doped ZnO thin films prepared by sol-gel spin coating method

In this study,7% Mn-doped ZnO thin film was deposited on glass substrate using sol–gel spin coating method at 0,7 ZnO concentration, in order to investigate the structural, optical and morphological properties. XRD result exhibit 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 45.15% in the visible range. The optical band gap energy was found to be 2.577 eV. The surface morphology showed a good uniformity with few cracks and wrinkles.
Citation

M. MAHROUG Abdelhafid, Ahmad Azmin Mohammad, , (2021), "Structural, morphological and optical properties of Mn-doped ZnO thin films prepared by sol-gel spin coating method", [international] 1st international conference on materials and energies (IC- ME-21) , Tamanghasset - Algeria

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Experimental and theoretical studies on structural, morphological, electronic, optical and magnetic properties of Zn1-xCuxO thin films (0≤ x≤ 0.125)

Pure and copper-doped zinc oxide thin films at different contents x (Zn1-xCuxO; 0≤x ≤ 0.125) were synthesized by sol–gel spin coating process and investigated using various techniques. All samples exhibited a polycrystalline with wurtzite hexagonal phase, which wasn't altered and getting relaxed by Cu-doping. The grain size increased and changed its growth mode from c-axis growth to lateral one and the surface morphology was strongly influenced with increasing level of Cu doping. As x increased, the transparency of films was generally increased in the visible region and the band gap energy (Eg) presented a slight shrinking, indicating that the prepared films are suitable for use in opto-electronic applications. Ferromagnetic phase was adopted within density functional theory corrected by Hubbard method (DFT + LDA + U) to investigate the structural, electronic, magnetic and optical properties of pure and CZO structure. The closest Cu impurities gave the more stable configuration. Cu3d states were distributed around Fermi level inducing a major contribution to the magnetic moment. A mix of ionic and covalent bonding was remarked. DFT + LDA + U enhanced significantly the calculated Eg, which presented a narrowing with x. The imaginary part of the dielectric functions presented three main peaks and their static constants were slightly influenced by Cu doping.
Citation

M. MAHROUG Abdelhafid, elhadj.benrezgua@univ-msila.dz, Muhamad Kamil Yaakob, Soorathep Kheawhom, Ahmad Azmin Mohamad, , (2021), "Experimental and theoretical studies on structural, morphological, electronic, optical and magnetic properties of Zn1-xCuxO thin films (0≤ x≤ 0.125)", [national] Materials Science in Semiconductor Processing , Elsevier

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Thickness effect on the properties of Mn-doped ZnO thin films synthesis by sol-gel and comparison to first-principles calculations

The current study investigates the effect of thickness on the structural, morphological, electronic, and optical properties of pure zinc oxide (ZnO) and 7% Mn-doped ZnO thin films, deposited by sol–gel spin coating method. All films exhibited a hexagonal wurtzite structure with a high preferential c-axis orientation. The surface morphology showed a good uniformity with cracks and wrinkles. The transmittance decreased with thickness. The bandgap energy was inversely varying with coating number. Photoluminescence spectra showed ultraviolet with strong and weak blue and weak green emission peaks. Density functional theory and Hubbard (DFT + U) method was then applied to study the structural, electronic, and optical properties of pure and 6.25% Mn-doped ZnO materials. A decrease in bandgap energy from pure to 6.25% Mn-doped ZnO material was shown using the DFT + U method. It also found that the Mn3d states were distributed far from Fermi level with a coexistence of both ionic and covalent nature bonds. A slight shift toward the lower energy was noticed for optical properties by Mn doping. The theoretical findings showed a similar behavior to those obtained by experiment.
Citation

M. MAHROUG Abdelhafid, Noureddine Selmi, Soorathep Kheawhom, Ahmad Azmin Mohamad, , (2021), "Thickness effect on the properties of Mn-doped ZnO thin films synthesis by sol-gel and comparison to first-principles calculations", [national] Ceramics International , Elsevier

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Thickness Effect on the Properties of 4% Mn‐Doped ZnO Thin Films Grown by Sol‐Gel Spin Coating Deposition

In this study, the thickness effect of 4% Mn-doped ZnO thin films on structural, optical, and morphological properties is investigated. The films are deposited on a glass substrate using the sol-gel spin coating method. Phase analysis indicates that all films have a hexagonal wurtzite structure with a high preferential c-axis orientation. All structural parameters are significantly influenced by the thickness variations. The optical analysis reveals that transmittance and band gap energy decrease with thickness. A red shift of the absorption edge is noticed. The surface morphology shows a good uniformity for all ZnO films. The surface roughness of the samples increases with film thicknesses. The photoluminescence (PL) spectra show a UV peak at 388 nm with two blue peaks at 438 and 475 nm and a weak green emission peak at 525 nm. A lower PL intensity is noticed by increasing the thickness. The obtained results exhibit similarities in behavior as other methods.
Citation

M. MAHROUG Abdelhafid, Noureddine Selmi, Ahmad Azmin Mohamad, , (2021), "Thickness Effect on the Properties of 4% Mn‐Doped ZnO Thin Films Grown by Sol‐Gel Spin Coating Deposition", [national] Macromolecular Symposia , Wiley Online Library

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Synthesis and Characterization of ZnO/CuONanostructuresthin films by sol gel technique

In this study, a ZnO/CuO nanostructured thin film with number of layers is 8 layers (ZnO-CuO-ZnO-CuO ....) were synthesized on glass substrates by the sol–gel spin coating technique. Zinc acetate dihydrate, Copper chloride dihydrate, ethanol and monoethanolamine (MEA) were used as precursor, solvent and stabilizer, respectively. Structural, optical and luminescence properties of the ZnO/CuO nanostructured thin films were investigated by XRD, UV-Vis spectrometry and PL spectroscopy techniques. X-ray diffraction shows, the high crystallinity of nanocomposite films with preferential orientation and crystallite size is 20 nm. Photoluminescence of films showed emissions in the ultraviolet (UV) and several visible emissions such as violet, blue, green, yellow and red correspond to near-edge band (NBE) of ZnO and CuO and the different defects in both oxides. A sharp absorption edge has been observed for nanocomposite films in the region between 350 and 400 nm. This attributed to the absorption of light by nanocomposites oxides thin films. Elaborated of high quality of ZnO/CuO nanostructures thin films can be used in several applications such as: solar cells and photocatalysis.
Citation

M. MAHROUG Abdelhafid, (2021), "Synthesis and Characterization of ZnO/CuONanostructuresthin films by sol gel technique", [international] 1st International Conference on Sustainable Energy and Advanced Materials IC-SEAM’21 April 21-22, 2021, Ouargla, ALGERIA , Ouargla, ALGERIA

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2020

Effects of Mn doping on the structural, morphological, electronic and optical properties of ZnO thin films by sol-gel spin coating method: An experimental and DFT+ U study

The structural, electronic and optical properties of Mn-doped ZnO thin films were studied using density functional theory (DFT) with Hubbard U method. Supercell model and substitutional method were employed to achieve the considered doping concentrations (x). Antiferromagnetic phase of Zn1−xMnxO (x = 0.125) structure was adopted at different geometry configurations. On the other hand, Zn1−xMnxO (x = 7, 10 and 12.5) thin films, with good uniformity, were fabricated using sol–gel spin coating technique. Both grain size and surface roughness were decreased with x, leading to the decrease of the average transmittance. Calculations revealed that Mn atoms tend to be close to each other around the O atom. Besides, Mn3d states were found to be rarely distributed around Fermi level. Furthermore, Mulliken analysis demonstrated the coexistence of both ionic and covalent bonding. Both materials presented a similar behavior for optical properties with a slight shift toward the lower energy by increasing x.
Citation

M. MAHROUG Abdelhafid, Ahmad Azmin Mohamad, Noureddine Selmi, , (2020), "Effects of Mn doping on the structural, morphological, electronic and optical properties of ZnO thin films by sol-gel spin coating method: An experimental and DFT+ U study", [international] Physica B: Condensed Matter , North-Holland

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Effects of Mn doping on the structural, morphological, electronic and optical properties of ZnO thin films by sol-gel spin coating method: An experimental and DFT+U study

The structural, electronic and optical properties of Mn-doped ZnO thin films were studied using density functional theory (DFT) with Hubbard U method. Supercell model and substitutional method were employed to achieve the considered doping concentrations (x). Antiferromagnetic phase of Zn1−xMnxO (x = 0.125) structure was adopted at different geometry configurations. On the other hand, Zn1−xMnxO (x = 7, 10 and 12.5) thin films, with good uniformity, were fabricated using sol–gel spin coating technique. Both grain size and surface roughness were decreased with x, leading to the decrease of the average transmittance. Calculations revealed that Mn atoms tend to be close to each other around the O atom. Besides, Mn3d states were found to be rarely distributed around Fermi level. Furthermore, Mulliken analysis demonstrated the coexistence of both ionic and covalent bonding. Both materials presented a similar behavior for optical properties with a slight shift toward the lower energy by increasing x.
Citation

M. MAHROUG Abdelhafid, (2020), "Effects of Mn doping on the structural, morphological, electronic and optical properties of ZnO thin films by sol-gel spin coating method: An experimental and DFT+U study", [national] Physica B: Condensed Matter , sciencedirect

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Synthesis and Characterization of CuO/ZnO Nanostructures thin films

In this study, a ZnO/CuO nanostructured thin films with number of layers is 8 layers (ZnO-CuO-ZnO-CuO ....) were synthesized on glass substrates by the sol–gel spin coating technique. Zinc acetate dihydrate, Copper chloride dihydrate, ethanol and monoethanolamine (MEA) were used as precursor, solvent and stabilizer, respectively. Structural, optical and luminescence properties of the ZnO/CuO nanostructured thin films were investigated by XRD, UV-Vis spectrometry and PL spectroscopy techniques. X-ray diffraction shows, the high crystallinity of nanocomposite films with preferential orientation and crystallite size is 20 nm. Photoluminescence of films showed emissions in the ultraviolet (UV) and several visible emissions such as violet, blue, green, yellow and red correspond to near-edge band (NBE) of ZnO and CuO and the different defects in both oxides. A sharp absorption edge has been observed for nanocomposite films in the region between 350 and 400 nm. This attributed to the absorption of light by nanocomposites oxides thin films. Elaborated of high quality of ZnO/CuO nanostructures thin films can be used in several applications such as: solar cells and photocatalysis.
Citation

M. MAHROUG Abdelhafid, (2020), "Synthesis and Characterization of CuO/ZnO Nanostructures thin films", [national] 1ère Conférence National sur la Transition Energétique en Algérie , M’sila, Algerié

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2019

STUDIES ON STRUCTURAL, SURFACE MORPHOLOGICAL, OPTICAL, LUMINESCENCE AND UV PHOTODETECTION PROPERTIES OF SOL–GEL Mg-DOPED ZnO THIN FILMS

Undoped and magnesium-doped zinc oxide thin films were prepared by the sol–gel method. Results from X-ray diffraction indicated that the films exhibited a hexagonal wurtzite structure and were highly oriented along the c-axis. The intensity of the (002) diffraction peak increased with increasing the Mg doping concentration. Also, Mg doping inhibited the growth of crystallite size which decreased from 46nm to 38nm with doping concentration. Morphological studies by atomic force microscopy (AFM) indicated the uniform thin film growth and the decreasing of grain size and surface roughness with Mg doping. Optical analysis showed that the average transmittance of all films was above 90% in the visible range and Mg doping has significantly enhanced the bandgap energy of ZnO. Two Raman modes assigned to E2L and E2H for the ZnO wurtzite structure were observed for all films. UV emission peak and three defect emission peaks in the visible region were observed by photoluminescence measurements at room temperature. The intensity ratio of UV emission to the visible emission increased with the Mg concentration. Photocurrent measurements revealed that all films presented the photoresponses with n-type semiconducting behavior and their generated photocurrents were reduced by Mg doping. The prepared thin films of high quality with improved properties by Mg doping could be proposed to workers in the field of optoelectronic devices for using them as a strong candidate.
Citation

M. MAHROUG Abdelhafid, (2019), "STUDIES ON STRUCTURAL, SURFACE MORPHOLOGICAL, OPTICAL, LUMINESCENCE AND UV PHOTODETECTION PROPERTIES OF SOL–GEL Mg-DOPED ZnO THIN FILMS", [national] Surface Review and Letters , worldscientific

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Studies on structural, surface morphological, optical, luminescence and uv photodetection properties of sol gel oxides thin films

ZnO and ZnCoO thin films have been deposited onto glass substrates by sol–gel spin coating
method. Zinc acetate dihydrate, cobalt acetate tetrahydrate, Isopropanol and monoethanolamine
(MEA) were used as a precursor, doping source, solvent and stabilizer respectively. The molar
ratio of MEA to ions metal was maintained at 1.0 and a concentration of metal ions is 0.6 mol.L-1
.
The XRD results showed that both films crystallized under hexagonal wurtzite structure and
presented a preferential orientation along the c-axis with the maximum crystallite size was found is
25nm. Atomic force microscope (AFM) images revealed the good uniformity for both films, an
increase of surface roughness is observed with doping. The average transmittance in the visible
region was higher than 85% for both films and the optical band gap of Zinc oxide films decreased
with Co doping. Photoluminescence of the films showed a ultraviolet (UV) and defect related
visible emissions like violet, blue and green, and indicated that cobalt doping resulted in red
shifting of UV emission and the reduction in the UV and visible emissions intensity. Ours thin
films shows the best photocurrent properties.
Citation

M. MAHROUG Abdelhafid, (2019), "Studies on structural, surface morphological, optical, luminescence and uv photodetection properties of sol gel oxides thin films", [international] ICAMS 2018 – 7th International Conference on Advanced Materials and Systems , Romania

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2018

Synthesis, Structural, Morphological, Electronic, Optical and Luminescence Properties of Pure and Manganese-Doped Zinc Oxide Nanostructured Thin Films: Effect of Doping

In this study, Manganese-doped Zinc oxide (ZnO) nanostructured thin films with different Mn doping concentrations (0, 1, 3, 5 and 7 mol.%) were synthesized on glass substrates by the sol–gel spin coating technique. The concentration of metal ions was fixed at 0.6 mol·L–1. Structural, surface morphological, optical and luminescence properties of the films were investigated by XRD, AFM, UV-Vis spectrometry and PL spectroscopy techniques. The XRD results showed that the films had hexagonal wurtzite structure and exhibited preferred orientation along the c-axis. Crystallite size, lattice parameters, strain and residual stress were influenced by Mn doping, where average crystallite size decreased from 45 to 10 nm with doping concentration. Atomic force microscope (AFM) images revealed the good uniformity for all the films, and reduction of grain size and surface roughness is observed with the increase of doping concentration. The average transmittance in the visible region was higher than 80% for all the films. Unlike the Urbach energy, the optical band gap of Zinc oxide films decreased with Manganese doping. The origin of ultraviolet, violet, blue and green emissions observed from photoluminescence spectra, and the effect of Mn doping on the luminescence properties and defects concentration were discussed in details. It is worth noting that the fabricated Zinc oxide (ZnO) thin films, which presented good properties, can be used for potential applications in optoelectronic devices.
Citation

M. MAHROUG Abdelhafid, L Guerbous, Nourddine Selmi, , (2018), "Synthesis, Structural, Morphological, Electronic, Optical and Luminescence Properties of Pure and Manganese-Doped Zinc Oxide Nanostructured Thin Films: Effect of Doping", [national] Journal of Nanoelectronics and Optoelectronics , American Scientific Publishers

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Deposition and Characterization of Mg doped nanostructured thin films

Magnesuim doped Zinc oxide thin films were prepared by sol-gel spin coating method
Citation

M. MAHROUG Abdelhafid, elhadj.benrezgua@univ-msila.dz, , (2018), "Deposition and Characterization of Mg doped nanostructured thin films", [international] International Conference on Materials Science 2018 (ICMS2018) , Sétif, Algeria

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Effect of Mn Doping on the Structural and Optical Properties of ZnO thin Films

In this work, we have studied the influence of Mn doping on the structural, morphological, optical and photoluminescence (PL) properties of ZnO thin films. ZnO thin films with different concentrations of Manganese (0, 2 and 4 mol.%) were prepared by the sol–gel spin coating process and synthesized on glass substrates. By using an X-ray diffractometer (XRD) (Bruker 8 Advance) with Cu-kα radiation having a wavelength λ=1.5406 A°, the structural properties of the films were characterised. To evaluate the band gap, the optical transmission spectra were measured by an ultraviolet-visible (UV-vis) spectrophotometer (UV-3101 PC-Shimadzu) in the spectral range 300-800 nm. Photoluminescence (PL) measurements were recorded using a spectrofluorimeter (Perkin Elmer LS 50B) with the excitation wavelength of 325 nm.
Citation

M. MAHROUG Abdelhafid, (2018), "Effect of Mn Doping on the Structural and Optical Properties of ZnO thin Films", [international] International Conference on Materials Science (ICMS2018) , Ferhat Abbas Setif 1-Algeria

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Experimental and first principles study of structural, electronic and optical properties of Zn0.875Mn0.125O thin film

Zn0.875Mn0.125O thin films are fabricated by a simple sol-gel spin-coating technique on glass substrates using zinc acetate dehydrate [Zn(CH3COO)2·2H2O] and manganese acetate tetrahydrate [Mn(CH3COO)24H2O]as a starting material and doping source. Isopropanol and monoethanolamine (MEA) were used as solvent and stabilizer, respectively. X-ray diffraction, ultraviolet-visible spectroscopy and photoluminescence spectroscopy are employed to investigate the effect of Mn doping on the structural, electronic and optical properties of ZnO thin films. The obtained results are compared with those using first-principles calculation based on density functional theory (DFT) with local density approximation (LDA) plus Hubbard U (DFT–LDA+U) method. This latter represents the theoretical framework to deal with strongly correlated materials to predicted successfully the electronic properties of such materials.
Citation

M. MAHROUG Abdelhafid, A. BENTABET, , (2018), "Experimental and first principles study of structural, electronic and optical properties of Zn0.875Mn0.125O thin film", [international] ICAMS 2018 – 7th International Conference on Advanced Materials and Systems , Bucharest, ROMANIA

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Structural, optical and luminescence properties of ZnO thin films prepared by sol-gel spin-coating method: effect of precursor concentration

Transparent zinc oxide (ZnO) thin films are fabricated by a simple sol-gel spin-coating technique on glass substrates with different solution concentrations (0.3–1.2 M) using zinc acetate dehydrate [Zn(CH3COO)2·2H2O] as precursor and isopropanol and monoethanolamine (MEA) as solvent and stabilizer, respectively. The molar ratio of zinc acetate dehydrate to MEA is 1.0. X-ray diffraction, ultraviolet-visible spectroscopy and photoluminescence spectroscopy are employed to investigate the effect of solution concentration on the structural and optical properties of the ZnO thin films. The obtained results of all thin films are discussed in detail and are compared with other experimental data.
Citation

M. MAHROUG Abdelhafid, NOURREDINE SELMI, , (2018), "Structural, optical and luminescence properties of ZnO thin films prepared by sol-gel spin-coating method: effect of precursor concentration", [national] Chinese Physics Letters , IOP Publishing

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2017

First principles LDA+U study of structural, electronic, elastic and optical properties of Mn doped wurtzite ZnO.

The structural, electronic, elastic and optical properties of pure and Mn-doped ZnO with a wurtzite structure were calculated by using first-principles calculation based on density functional theory (DFT) with local density approximation (LDA) [1] plus Hubbard U (DFT–LDA+U) method [2]. This latter represents the theoretical framework to deal with strongly correlated materials to predicted
successfully the electronic properties of such materials. The wurtzite ZnO system is then doped with Mn at different sites. The obtained results were discussed and compared with earlier works.
Citation

M. MAHROUG Abdelhafid, A. Bentabet, , (2017), "First principles LDA+U study of structural, electronic, elastic and optical properties of Mn doped wurtzite ZnO.", [international] Nanotechnology and nanomaterials» (NANO-2017) , Ukraine - Chernivtsi

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2014

Structural, morphological and optical properties of undoped and Co-doped ZnO thin films prepared by sol–gel process

Undoped and Co-doped ZnO thin films with different amounts of Co have been deposited onto glass substrates by sol–gel spin coating method. Zinc acetate dihydrate, cobalt acetate tetrahydrate, isopropanol and monoethanolamine (MEA) were used as a precursor, doping source, solvent and stabilizer, respectively. The molar ratio of MEA to metal ions was maintained at 1.0 and a concentration of metal ions is 0.6 mol L−1. The Co dopant level was defined by the Co/(Co + Zn) ratio it varied from 0 to 7 % mol. The structure, morphology and optical properties of the thin films thus obtained were characterized by X-ray diffraction (XRD), energy dispersive X-ray spectrometer (EDX), scanning electron microscopy (SEM), ultraviolet–visible (UV–Vis), photoluminescence (PL) and Raman. The XRD results showed that all films crystallized under hexagonal wurtzite structure and presented a preferential orientation along the c-axis with the maximum crystallite size was found is 23.5 nm for undoped film. The results of SEM indicate that the undoped ZnO thin film has smooth and uniform surface with small ZnO grains, and the doped ZnO films shows irregular fiber-like stripes and wrinkle network structure. The average transmittance of all films is about 72–97 % in the visible range and the band gap energy decreased from 3.28 to 3.02 eV with increase of Co concentration. DRX, EDX and optical transmission confirm the substitution of Co2+ for Zn2+ at the tetrahedral sites of ZnO. In addition to the vibrational modes from ZnO, the Raman spectra show prominent mode representative of ZnyCo3−yO4 secondary phase at larger values of Co concentration. PL of the films showed a UV and defect related visible emissions like violet, blue and green, and indicated that cobalt doping resulted in red shifting of UV emission and the reduction in the UV and visible emissions intensity.
Citation

M. MAHROUG Abdelhafid, S. Boudjadar, L. Guerbous, , (2014), "Structural, morphological and optical properties of undoped and Co-doped ZnO thin films prepared by sol–gel process", [national] Journal of Materials Science: Materials in Electronics , springer

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Structural, optical and photocurrent properties of undoped and Al-doped ZnO thin films deposited by sol–gel spin coating technique

Undoped and Al-doped ZnO thin films have been deposited onto glass substrates by the sol–gel spin coating method and their structural and optical properties have been investigated. The XRD results showed that all films were crystallized under hexagonal wurtzite structure and presented a preferential orientation along the c-axis where the maximum crystallite size was found to be 25 nm for undoped film. The average transmittance of all films is over 95% in the visible region and the band gap energy increases from 3.25 to 3.29 eV with the increase of Al concentration. In addition to the vibrational modes from undoped ZnO, longitudinal optical (LO) mode in the Raman spectra was enhanced by the Al doping. Photoluminescence of the films showed an ultraviolet (UV) and defect related visible emissions like violet, blue and green. 3% Al doped ZnO film shows the best photocurrent properties.
Citation

M. MAHROUG Abdelhafid, S. Boudjadar, Lakhdar Guerbous, , (2014), "Structural, optical and photocurrent properties of undoped and Al-doped ZnO thin films deposited by sol–gel spin coating technique", [national] Materials letters , Elsevier

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