Sameh Ibrahim Ahmed

Sameh Ibrahim Ahmed
Ain Shams University · Department of Physics

PhD

About

57
Publications
9,069
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458
Citations
Citations since 2017
51 Research Items
426 Citations
2017201820192020202120222023050100150
2017201820192020202120222023050100150
2017201820192020202120222023050100150
2017201820192020202120222023050100150

Publications

Publications (57)
Article
Full-text available
The functionals mBJ-LDA and mBJ-GGA result in high band gaps. BiGaO3 contains covalent bonds due to the mixing of O 2p states with the Bi and Ga s,p states. The Bi breadth PDOS was obviously less in the valence band region compared to Ga and O, with fewer peaks than there were for Ga and consequently Ga-O hybridization is more powerful than Bi-O hy...
Article
Full-text available
Nano copper cobaltite/manganese sulfide, (1−x)CuCo2O4/xMnS (x = 0.0, 0.25, 0.5, 1) samples were synthesized applying thermolysis and hydrothermal process. Phase identification using x-ray diffraction and Rietveld analysis disclosed single-phase CuCo2O4 (CCO) for intermediate samples (x = 0.25, 0.5) implying that MnS phase is not formed. X-ray photo...
Article
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Fe1.96Eu0.04O3 (FUO)/\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$/$$\end{document}ZnS nanocomposite system was prepared using sol gel and thermolysis procedures. St...
Article
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CdSx thin films (x = 1.0, 0.8, 0.6, 0.4, 0.2) were prepared by the sol–gel spin coating method. The grazing incidence diffraction and Raman spectroscopy techniques were applied to explore the phases formed and microstructure of the produced thin films. The chemical composition of the formed thin films was investigated using X-ray photoelectron spec...
Article
(1 – x )MnFe 2 O 4 (MFO)/ x ZnMn 2 O 4 (ZMO) ( x = 0, 0.2, 0.5, 0.8, and 1.0) nanocomposite samples were prepared using co-precipitation procedure. The phase percentage, cell parameters, and crystallite size of MFO and ZMO phases in each nanocomposite sample were calculated using Rietveld refinement procedure. The x-ray diffraction (XRD) analysis a...
Article
Full-text available
Using a sol–gel route, nanocrystals of γ-Fe2−xYxO3 were prepared with various mole fractions x = 0.00, 0.02, 0.04, and 0.06 of Y. XPS confirmed the Y-doping of the samples and rolled out the occurrence of any oxidation states other than Y³⁺ and Fe³⁺. Cubic nanocrystals with space group P4332\documentclass[12pt]{minimal} \usepackage{amsmath} \usepac...
Article
We presented in this work the effect of sand mass and grains size on optical transmission and mechanical resistance of soda-lime glass subjected to sandblasting simulated in laboratory. Glass samples were sandblasted under various test conditions (projected sand masses Mp: from 5 to 120 g and grains size Φ: (300±50, 1000±114 and 1700±175)μm). The r...
Article
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Nano-Eu-doped maghemite Fe2-xEuxO3 samples with x = 0, 0.02, 0.04, and 0.06 were formed using a sol–gel rout. Phase identification, utilizing X-ray diffraction data (XRD), revealed the formation of ordered maghemite phase, which is confirmed by Fourier transform infrared (FTIR) measurements. Structural analysis was performed applying Rietveld metho...
Article
The C14H12Br2S3 molecule has twofold imposed crystallographic symmetry in the solid state. 2C14H12Br2S3Bis (2-Bromobenzyl) trisulfide in the orthorhombic structure with space group P21212 is described and compared with other similar compounds. The structural, electronic, and optical properties of the anhydrous orthorhombic 2C14H12Br2S3Bis (2-Bromob...
Article
Full-text available
The Nd0.6Sr0.3K0.1MnO3 polycrystalline manganite is synthesized by using the sol–gel procedure. Structural, magnetic and magnetocaloric properties have been systematically investigated. The Rietveld refinement analysis indicates that studied compound is indexed in the orthorhombic system with Pnma space group. Magnetization data display a second-or...
Article
Full-text available
Using density functional theory (DFT), the structural, elastic, electronic, and thermodynamic properties of Fe2Hf in the cubic and hexagonal solid phases with Fd-3m and P63/mmc are reported with generalized gradient approximations (GGA). To achieve energy convergence, we report the k-point mesh density and plane-wave energy cutoffs. The calculated...
Article
Full-text available
Nanocomposite (1-x) ZnMn2O4/xCdS (0.0 ≤ x ≤ 0.2) samples are prepared employing co-precipitation and thermolysis procedures. Phase analysis applying x-ray diffraction disclosed the presence of two phases: main ZnMn2O4 (ZMO) phase (~98%) and very minor CdS phase (~2%). The influence of alloying between ZnMn2O4 (ZMO) and CdS on the cell parameters an...
Article
This work presents a simple and fast seed-mediated synthesis of [email protected]γ-Fe2O3 nanospheres with structural and optical characterization. A sequential growth of ZnFe2O4 and γ-Fe2O3 components on preformed ZnO seeds was achieved by a sol–gel route. The High-Resolution Transmission Electron Microscopy (HRTEM) disclosed the morphology, partic...
Article
In the current work, the optical properties of tin oxide thin films have been tailored via gamma irradiation for energy applications. The effect of Gamma radiation (50, 100, 150, 200 and 250 kGy) on the microstructural, absorption and oscillator parameters of SnO 2 thin films has been investigated. XRD results reveal that the SnO 2 films have the s...
Article
Maghemite (γ-Fe2O3) nanoparticles were prepared and then incorporated in carboxymethyl cellulose (CMC) polymers using a simple casting method to prepare multifunctional nanocomposite films. The properties of CMC/maghemite nanocomposites were ascertained through several analytical techniques. The intervention of maghemite nanofillers resulted in the...
Article
Nano gadolinium oxide doped polyvinyl alcohol/polyethylene glycol blend (PVA/PEG) was prepared by sol–gel and casting methods. Rietveld refinement method was used for structural and microstructural investigation. The X-ray diffraction (XRD), scanning electron microscope (SEM) and Fourier transform infrared (FTIR) techniques were applied to study th...
Article
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Zn and Mn co-doped nano-NiFe2O4 (NFO) system was prepared by alloying NFO with ZnMn2O4 (ZMO) samples. The possibility of forming NFO single phase was examined using X-ray diffraction and Fourier-transform infrared spectroscopy (FTIR) techniques. The effects of co-doping on the crystallite size, cell parameter and cation distribution of NFO were inv...
Article
Full-text available
Intact and non-intact urinary stones richening with calcium oxalate were collected and characterized. The elemental analysis, phase quantifications, and function groups were determined by different spectroscopic techniques, namely: energy-dispersive X-ray fluorescence (EDXRF), the synchrotron radiation X-ray diffraction (SR-XRD), and attenuated tot...
Article
Full-text available
A detailed study of structural, magnetic, magnetocaloric and magneto-transport properties of Nd0.6Sr0.4−xKxMnO3 (x = 0.0, 0.1 and 0.2) manganite, prepared using the sol–gel process, has been performed. All compounds are pure single phase crystallized in the orthorhombic system with Pnma space group. Rietveld analysis reveals the dependence of struc...
Article
Full-text available
This work disseminates the characterization, and facile production of unprecedented amino-functionalized CuNPs synthesized chitosan membrane for application of the purification process of anionic dyes alongside electrochemical properties. Chitosan solution dissolved in an aqueous acetic solution with a 2% acidic concentration, was used to synthesis...
Article
Full-text available
Iron-doped nano ZnMn2O4 (ZnMn2-xFexO4, x = 0, 0.05, 0.15, 0.2) samples were formed using the sol–gel method. Rietveld refinement method revealed small changes in the cell parameters and crystallite size upon doping ZnMn2O4 with Fe. ZnMn2O4 is partially inverse spinel and it exhibited a normal spinel structure as it doped with Fe. The nano nature of...
Article
Full-text available
Low calcium oxalate urinary stones from the kidney, bladder, and ureter have been collected from the arid area (Taif, Saudi Arabia). After careful washing and drying of the collected stones, the samples were converted into a contamination‐free homogenous fine powder with a particles' size smaller than 50 μm. The processed urinary stone powders were...
Article
Full-text available
Nano Cd0.9Mg0.05S was synthesized applying the thermolysis technique in air and under flow of nitrogen. Samples obtained exhibited CdS structure with two phases. Rietveld refinement analysis was used to determine the different structure parameters. Analysis of UV–Vis absorption spectra disclosed that the optical band gap of CdS sample prepared in N...
Article
In this work, the effects of magnetic fields on the refractive index profiles and induced birefringence of polystyrene/MgFe2O4 nanoparticles (15 nm) solutions and thin films were investigated. Both the refractive index and the induced birefringence profiles of the solutions and thin films were investigated as a function of the applied magnetic fiel...
Article
Nano MnS and ZnS samples are prepared through a simple thermolysis procedure. The effect of synthesis temperature on the different phases formed and their percentages, and on the lattice parameters and crystallite size of MnS and ZnS is examined using Rietveld analysis for X‐ray diffraction patterns. The minimum synthesis temperature at which MnS c...
Article
TlInSeS optical properties at photon energy ranges from 0.96 to 5.06 eV have been determined by means of variable-angle spectroscopic ellipsometry (VASE). This energy range contains the fundamental band gap. The measured pseudo-dielectric ε(E) spectrum depicts different peaks. The spectrum is analyzed with reference of two inter-band transitions mo...
Article
Full-text available
Nanocomposite (1 − x)CuS/(x)MnS samples (x = 0, 0.25, 0.5, 0.75, 1) were prepared by a simple thermolysis procedure at low temperature (250 °C). HighScor plus program and Rietveld profile method revealed that CuS crystallized in hexagonal phase, while MnS crystallized in hexagonal and cubic phases. The intermediate alloying ratios (x = 0.5, 0.75) h...
Article
Full-text available
Ga0.9Al0.1FeO3 and Ga0.75Al0.25FeO3 samples were obtained using a solid-state reaction process. Phase analysis indicated that all samples are single phase having an orthorhombic structure. The effect of Al doping on the lattice parameters, the distortions in the tetrahedral and octahedral bond lengths and angles and cation distribution of different...
Preprint
Full-text available
We report computations of all properties cited in title within GGA and LDA for cubic perovskite BiGaO 3 . Lattice constants, bulk modulus, elastic moduli and band gaps were computed. BiGaO3 is elastically stable at room temperature and equilibrium pressure. We predicted the Debye temperature and longitudinal and transverse waves along [100], [110]...
Article
Full-text available
Nd 0.6 Sr 0.4 MnO 3 polycrystalline manganite was synthesized by two different methods: the auto-combustion reaction (NSMO-AC) and the sol-gel method (NSMO-SG). The structural, magnetic, magnetocaloric and critical behavior of the samples were examined. Rietveld refinements of the XRD patterns revealed that both compounds are pure single phase inde...
Article
Full-text available
CdS and Cd0.95Mn0.05S were synthesized using a thermolysis procedure in the air and underflow of nitrogen. Rietveld analysis for X-ray diffraction data revealed that all samples have two phases (hexagonal wurtzite and cubic zinc blende). The effect of Mn doping and the preparation conditions on the phase percentages, the crystallite size, lattice p...
Article
PVA/PVP blend embedded with different ratios of nano Cu0.9Mn0.1S (Cu/MnS) was prepared with thermolysis and casting techniques. X‐ray diffraction analysis showed the formation of nano Cu/MnS as a single hexagonal phase with an average crystallite size 11 nm. Scanning electron microscope (SEM) revealed nearly homogenous particles morphology. Fourier...
Article
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Solid solutions from (1-x)ZnMn2O4/(x)MgFe2O4\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$(1-x){\mathrm{ZnMn}}_{2}{\mathrm{O}}_{4}/(x){\mathrm{MgFe}}_{2}{\mathrm{O}}_...
Article
Anode materials for Lithium-Ion Batteries (LIBs) based on Mo- and V-doped maghemite were prepared by the sol-gel route. High-Resolution Transmission Electron Microscopy (HRTEM) showed the formation of isotropic nanoparticles. The X-ray Photoelectron Spectroscopy (XPS) revealed the presence of Fe³⁺ and Mo⁶⁺ or V⁴⁺ for Mo- or V-doped samples, respect...
Article
Full-text available
There is a growing potential use of molybdenum disulfide (MoS2) nanosheets loaded in polyvinylidene fluoride (MoS2/PVDF) in the fields of optoelectronics, ion batteries, and energy storage applications. The one-pot hydrothermal route was used to obtain exfoliated MoS2. The MoS2 nanoflakes were used to obtain MoS2/PVDF nanocomposite films by the sol...
Article
Full-text available
Nanocomposites (1-x)MnS-xZnS (x=0, 0.25, 0.5, 0.75, 1) heterostructures were synthesized by a simple chemical procedure at low temperature (300 ºC). The influence of the alloying ratio (x) on the phases developed was investigated utilizing the Rietveld x-ray diffraction (XRD) analysis and Fourier transform infrared (FTIR). Zinc sulfide crystallized...
Article
Full-text available
Non-stoichiometric ZnS1-x:Mnx nanomaterials were prepared using a thermolysis procedure by decreasing the stoichiometric amount of thiourea relative to the amount of zinc acetate as starting precursors: Zn(Ac) /(1-x) thiourea in the presence of (x) manganese acetate (x=0, 0.01, 0.03, 0.05 and 0.1). Rietveld X-ray diffraction analysis was used to ex...
Article
Full-text available
A newly synthesized zinc(II) complex, namely tert-butyl N-(2 mercaptoethyl)carbamatozinc(II) complex [Zn(Boc-S)2] (Boc = tert-butyl N-(2-mercaptoethyl)carbamate), has been used as an organozinc precursor for the production of crystalline ZnO and ZnO/TiO2 nanoparticles (NPs). The synthesized complex and the obtained nanomaterials were fully characte...
Article
Full-text available
We have investigated structural and optical properties of gallium oxide (Ga2O3) thin films deposited on pre-cleaned fused quartz substrates at room temperature by RF sputtering method. The as-prepared and annealed Ga2O3 thin films are characterized by X-ray diffraction, energy dispersive X-ray fluorescence, fluorescence spectrometer and a double be...
Article
Full-text available
Morphological and electrical properties of AlMg thin films and the impact of the elaboration conditions on their quality are investigated. For this purpose, thin layers of AlMg of different Mg content were deposited by vacuum evaporation on a monocrystalline silicon substrate in the MECA2000 evaporator. The properties were studied by the X-ray diff...
Article
Morphological and electrical properties of AlMg thin films and the impact of the elaboration conditions on their quality are investigated. For this purpose, thin layers of AlMg of different Mg content were deposited by vacuum evaporation on a monocrystalline silicon substrate in the MECA2000 evaporator. The properties were studied by the X-ray diff...
Article
Full-text available
The effect of microstructure and chemistry on the kinetics of passive layer growth and passivity breakdown of some Ti-based alloys, namely Ti-6Al-4V, Ti-6Al-7Nb and TC21 alloys, was studied. The rate of pitting corrosion was evaluated using cyclic polarization measurements. Chronoamperometry was applied to assess the passive layer growth kinetics a...
Article
This work presents a modified solvothermal process for a facile synthesis of high thermally stable nanocrystalline anatase TiO2 NPs doped with Cu2O NPs. A Z-scheme mechanism was used to account for the enhanced photocatalytic activity exhibited by these materials. Also, the nanocomposite was impregnated in cotton fabric to obtain a modified fiber w...
Article
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Fine aerosol particles with an aerodynamic diameter equal or less than 2.5 μm (PM2.5) have been collected from two sites (residential and industrial) in Greater Cairo, Egypt and one site in Zarqa, Jordan. Based on the elemental quantitative analysis of PM2.5 using energy dispersive X‐ray fluorescence with Mo secondary target, Pb concentrations incr...
Article
Defect spinel Fe3-δO4 samples doped with high-valent Mo and V cations have been prepared by sol-gel auto-combustion rout with increasing concentrations of Mo and V, respectively. Energy Dispersive X-ray fluorescence (EDXRF) and Attenuated Total Reflection Fourier transform Infrared (ATR-FTIR) spectroscopies have verified the compositions of the sam...
Article
Full-text available
Thin films of In2O3 and In2O3 doped with Ag⁺ or Cu²⁺ were assembled by spray pyrolysis from aqueous solution at 450 °C. The microstructure analysis and optical properties were investigated using XRD, SEM, EDX and UV–Vis. spectrophotometer. XRD analysis proved that Ag-doping greatly reduces the crystallites sizes of In2O3 from 96 nm to 59 nm. Howeve...
Article
Fractionated atmospheric aerosols with sizes ranged from 0.25 μm to > 16 μm have been collected on silicon wafers using a 7-stage cascade impactor from the centre location of Jeddah city, Saudi Arabia during May 2015. Two fractionated sizes were selected in the present work, namely 0.5–0.25 μm (PM0.5–0.25) and 2–1 μm (PM2.0–1.0), because their mass...
Article
Mud and salt samples from six different locations have been collected from the eastern shore of the Dead Sea, Jordan. Wavelength dispersive X-ray fluorescence (WDXRF) showed twenty-five elements in the mud and salt samples. Shape and grain size of the studied samples were characterized by Scanning Electron microscopy (SEM). Quantitative phase analy...
Article
Polycrystalline Se1-xMnx (x = 0.01, 0. 03 and 0.05) samples were prepared by solid state reaction. The x-ray analysis using Rietveld method revealed the presence of two phases in the Se1-xMnx matrix; the Se phase and MnSe phase. The magnetization measurement showed three peaks at; 270, 160 and 150 K. The two peaks at 150 K and 160 K are due to anti...
Data
a b s t r a c t Nickel copper manganites, Ni x Cu 1-x Mn 2 O 4 (where 0 ≤ X ≤ 1), powders have been synthesized via co-precipitation method. The formed particles were obtained from the precipitate precursors annealed at 800 • C for 2 h. The prepared powders were tested for the catalytic oxidation of carbon monoxide (CO) into carbon dioxide (CO 2)....
Article
The structural properties of zinc ferrite nanoparticles with spinel structure dispersed in a highly porous SiO(2) aerogel matrix were compared with a bulk zinc ferrite sample. In particular, the details of the cation distribution between the octahedral (B) and tetrahedral (A) sites of the spinel structure were determined using X-ray absorption spec...
Article
Nanosize polycrystalline sample of the mixed oxides SnO2+xAl2O3 (x=0, 25, 50, 75wt%) were synthesized by sol–gel technique. The resulting samples were characterized with X-ray powder diffraction (XRD), differential thermal analysis (DTA) and thermogravimetric analysis (TGA). Rietveld quantitative phase analysis shows that part of alumina is incorpo...
Article
Information on the energy band gaps, the lattice parameters and the lattice matching to available substrates is a prerequisite for many practical applications. A pseudopotential plane-wave method as implemented in the ABINIT code is used to the AsxPyN1−x−yB quaternary alloys lattice matched to BP substrate to predict their energy band gaps and latt...
Article
Full-text available
The changes in the crystal structure, microstructure and thermal expansion occurred upon doping GaN with Al or Gd have been investigated by X-ray diffraction technique. The results showed that Al as well as Gd atoms are accommodated interstitially but in different interstitial positions in the GaN lattice. Anisotropic crystallite size and microstra...

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In quantitative analysis, there are two or more phases in the sample. Maud show calculated and observed patterns only. I need Maud to show the partial pattern of each of the constituting phases.

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