wael-saad

وائل سعد محمد أحمد

مدرس - فيزياء المواد والنانوتكنولوجي

كلية العلوم

العنوان: سوهاج - ساقلته

3

إعجاب
2018 | الكلمات المفتاحية X-ray diffraction Transmission,
Synthesis, characterization and photocatalysis enhancement of Eu2O3-ZnO mixed oxide nanoparticles
Pure ZnO nanoparticles (NPs) and mixed Eu2O3 and ZnO NPs with different Eu2O3 ratios (5%, 10%, and 15%) were synthesized by a precipitation method under optimum conditions. The synthesized samples were characterized by means of X-ray diffraction, scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy, transmission electron microscopy (TEM), Fourier transform infrared (FTIR) spectroscopy,Raman spectroscopy, and UV–vis diffuse reflectance spectroscopy. The ... إقراء المزيد

2018 | الكلمات المفتاحية CdTe thin films,
Effect of CdCl2 heat treatment in (Ar + O2) atmosphere on structural and optical properties of CdTe thin films
Cadmium telluride (CdTe) thin films were deposited by thermal evaporation method under base pressure 2 ×10−5 mbar on corning glass substrate. In this work, we study the effect of cadmium chloride (CdCl2) heat treatment in argon and oxygen (Ar + O2) atmosphere on the structural, morphological and optical properties of CdTe thin films to achieve high quality thin film absorber ... إقراء المزيد

2017 | الكلمات المفتاحية CdS thin films,
Influence of (Ar + O2) atmosphere and CdCl2 coating heat treatment on physical properties of CdS thin film for solar cell applications
Cadmium sulphide (CdS) thin films have been grown on corning glass substrate by thermal evaporation technique under base pressure 2 × 105 mbar. In this study we investigate the influence of Cadmium chloride (CdCl2) heat treatment and argon and oxygen (Ar + O2) annealing on the structural, morphological optical and electrical properties of CdS thin films to achieve high quality ... إقراء المزيد

2017 | الكلمات المفتاحية photocatalyst,
α-Bi2O3 nanorods: synthesis, characterization and UV-photocatalytic activity
In this study, Monoclinic bismuth oxide nanorods (α-Bi2O3 NRs) were successfully synthesized by a simple one-step hydrothermal route using (water: ethanol) (1:1) as a mixed solvents at optimum conditions. The Bi2O3 nano-powder was characterized in detail by different techniques in terms of their structural, morphological, compositional, optical and photocatalytic properties. X-ray diffraction (XRD) analysis indicated that the as-synthesized Bi2O3 NRs ... إقراء المزيد

2016 | الكلمات المفتاحية soft phonon,
Hardening of the soft phonon in bulk SrTiO3 interfaced with LaAlO3 and SrRuO3
The low-temperature softening of the TO1 phonon of SrTiO3 (STO), which determines its incipient ferroelectricity, is known to be partially hindered either in the bulk under strong electric fields, or in thin STO films. Here we show, by terahertz (THz) reflectivity measurements, that a similar effect is produced in bulk STO and at zero static field by ultrathin metallic films ... إقراء المزيد

2015 | الكلمات المفتاحية dielectric properties,
Optical study of the vibrational and dielectric properties of BiMnO3
BiMnO3 (BMO), ferromagnetic (FM) below Tc 100 K, was believed to also be ferroelectric (FE) due to a noncentrosymmetric C2 structure, until diffraction data indicated that its space group is the centrosymmetric C2/c. Here we present infrared phonon spectra of BMO, taken on a mosaic of single crystals, which are consistent with C2/c at any T >10 K, as well ... إقراء المزيد

2015 | الكلمات المفتاحية Raman phonon,
Raman phonon spectrum of the Dzyaloshinskii-Moriya helimagnet Ba2CuGe2O7
The Raman spectrum of Ba2CuGe2O7, a tetragonal insulator which develops Dzyaloshinskii-Moriya helical magnetism below TN = 3.2 K, has been detected at temperatures varying from 300 to 80 K in a single crystal, with the radiation polarized either in the ab plane or along the c axis of its tetragonal cell. Twenty-nine phonon lines out of the 35 allowed by ... إقراء المزيد

2015 | الكلمات المفتاحية electrical properties,
Structural and electrical properties of In35Sb45Se20−xTexchalcogenidethin films.
The structural and electrical properties of the as-prepared and annealed In45Sb35Se20−_x_Te_x_ thin films with different compositions (_x_ = 2.5, 5, 7.5, 10, 12.5 and 15 at.%) prepared by electron beam evaporation method are studied. The XRD patterns of the as-prepared thin film show that the investigated compositions have amorphous and polycrystalline structure depending on the Te content. After annealing the ... إقراء المزيد

2014 | الكلمات المفتاحية optical properties,
Optical study of the insulator-to-metal transition in LaxMnO3 thin films
Lanthanum manganites with a massive concentration of La defects can be stabilized in the form of thin films, by exploiting the structural stress produced by a substrate such as SrTiO3. They undergo an insulator-to-metal transition (IMT) like those doped by divalent ions, which is here studied by measuring the optical conductivity of La_x_MnO films with _x_ = 0.66, 0.88, 0.98 ... إقراء المزيد

2014 | الكلمات المفتاحية electronic transition,
Optical spectra of LaMn0.5Ga0.5O3:  Acontribution to the assignment of the electronic transitions in manganites
We have prepared a LaMn0.5Ga0.5O3 thin film deposited by Pulsed Laser Deposition on a LSAT substrate and we have measured its transmittance in the visible and near UV range, from 300 to 10 K. The aim was to shed light on the origin of the electronic bands in the LMO family through a comparison with the corresponding spectra collected previously ... إقراء المزيد