A5086080603- Gas Sensing Nanomaterials and Sensors
- ZnO doping and properties
- Transition Metal Oxide Nanomaterials
- Copper-based nanomaterials and applications
- Chalcogenide Semiconductor Thin Films
- Quantum Dots Synthesis And Properties
- Advanced Photocatalysis Techniques
- Semiconductor materials and interfaces
- Ga2O3 and related materials
- Magnetic Properties and Synthesis of Ferrites
- Iron oxide chemistry and applications
- TiO2 Photocatalysis and Solar Cells
- Organic and Molecular Conductors Research
- Magnetism in coordination complexes
- Semiconductor materials and devices
- Catalytic Processes in Materials Science
- Corrosion Behavior and Inhibition
- Molecular Junctions and Nanostructures
- Catalysis and Oxidation Reactions
- Glass properties and applications
- Enhanced Oil Recovery Techniques
- 2D Materials and Applications
- Conducting polymers and applications
- Photoacoustic and Ultrasonic Imaging
- Mesoporous Materials and Catalysis
National Research Centre
2000-2023
National Water Research Center
1994-2020
United States Department of State
2006
Suez University
2001
Cairo University
1990
thin films were prepared conveniently and reproducibly using the spray‐pyrolysis technique. This method enables incorporation of foreign materials like indium in matrix. The effect In on conductivity optical properties was studied. presence bulk film increases its does not affect to a significant extent. energy gap calculated for different layer thickness pure In‐incorporated films. Heterojunction solar cells investigated standard potentiostatic power characteristics photovoltaic analyzed...
Abstract Nickel acetylacetonate of 0.2 M aqueous solution is used to synthesize (NiO) thin films by pulsed spray pyrolysis method onto glass substrates. Structural and morphological properties the deposited were examined using (XRD) (FESEM) techniques. The results revealed that at low substrate temperatures short time, obtained amorphous, whereas higher long time has a cubic phase. Cross-sectional FESEM properly estimate thicknesses. energy band gap calculated be 3.52–3.89 eV optical...
CdO thin films prepared by spray pyrolysis technique show temperature dependence growth when the time is constant. In contrast, film thickness dependent substrate The are polycrystalline in covered and ranges. crystallite size microstrain calculated analyzed. Atomic Force Microscopy (AFM) micrographs prove that grains uniformly distributed within scanning areas (5 μm × 5 μm) (50 50 μm). roughness shows a considerable decrease with temperature. All samples an abrupt change transmission which...
We present reflectivity measurements on monoclinic MoO2, orthorhombic α-MoO3, and β-MoO3 in a wide frequency range of 190–2500 nm. The extracted optical conductivity [σ(ω)] showed that MoO2 has metallic character while α-MoO3 have an insulating behavior. In addition, the photochromic properties both been studied. σ(ω) spectra for samples different spectral weight transition due to formation color center bands, which formed as result UV exposure. from bulk sixfold cations Mob5+ Mo6+ is higher...
Abstract The electrical resistivity of the tetracyanoquinodimethane salts ten alkali and transition metal cations has been investigated at temperatures from 300 to 470 K. measurements indicate a phase transition, activation energy conductance being smaller in high temperature region. nature this is discussed.
In the current study, α-MoO3 nanocrystals were successfully synthesized from ammonium heptamolybdate tetrahydrate using a simple hydrothermal route. The influence of calcination temperature on structural, optical and electrical properties was systematically investigated for MoO3 powder products. XRD results analyzed these powders, revealing formation mixed phase (β- α-MoO3) at temperatures ranging 350 °C–450 °C, hence residual monoclinic still exists in samples 450 °C. Subsequently,...
Nano-crystalline thin films of pure and La-Co mixed oxides were deposited using the spray pyrolysis technique. All deposition parameters kept constant took place at a substrate temperature 723 K. The structures all evaluated by X-ray diffraction. Films found to be phase Co3O4 with single diffraction peak for (3 1 1) plane. By increasing La/Co ratio structure was significantly affected new cobalt mono-oxide, CoO, = 0.4. grain size range from 6.63 11.68 nm. Energy dispersive spectroscopy...