Oday Mazin Abdulmunem

The process of mixing different weight ratios of aluminium (2, 4, and 6 wt%) and zinc powder – as the target material – was conducted in a vacuumed quartz tube. The sintering processing was completed by leaving the powder for 2 h in an oven at 1000 ᴼC, facilitating the manufacturing of homogeneous alloys. The posterior, prepared by vacuum evaporati...

Zinc oxide thin films annealed at different temperatures (400, 450, 500, 550 °C) were prepared using the spray pyrolysis technique (SPT). X-ray scattering measurements have shown that the films were polycrystalline, having a hexagonal wurtzite structure with a dominated alignment in the (002) plane direction. The films undergo increases in crystall...

In this work, TiO nanostructure films were deposited via vacuum thermal evaporation at a temperature of 80°C. The TiO thin films were annealed under vacuum for 1 h at three different degrees (200, 300, and 400°C) in addition to the thin film prepared at 80°C. X-ray Diffraction (XRD) showed that all the deposited and annealed TiO films had anatase p...

Zinc oxide (ZnO) nanostructures were deposited on glass substrates by physical vapor deposition technique. To improve the crystallinity of ZnO, oxidation treatment was conducted at 400◦ for 1 h in an atmospheric environment. The films characteristics of the films were examined by X-ray diffraction, ultraviolet–visible spectroscopy, atomic force mic...

CdO and CdO: F films were grown using spray pyrolysis method (SPM). The effects of F doping on physical characterization were estimated using XRD, AFM and optical absorption. XRD patterns indicate that samples are cubic polycrystalline with preferred (111) orientation. AFM images assure that films consist of uniform spherical shaped grains, smooth...

Zirconium oxide (ZrO 2 ) and Cu doped ZrO 2 films were grown successfully by spray pyrolysis deposition (SPD). The structural, surface morphology and optical properties were analyzed. XRD patterns reveal films polycrystallinity and monoclinic phase intensity of ZrO 2 with preferred orientation along M (111) plane increasing with increasing doping....

Nanostructured Nickel oxide (NiO) and NiO doped with 2% and 4% Au were prepared via spray pyrolysis technique (SPT). Structure, surface morphology, and optical properties were evaluated via XRD, AFM and UV-VIS spectrometer. Results indicate that all thin films polycrystalline and the peaks at 37.28° and 43.29° corresponding to (111), (200). The AFM...

Nanostructured copper oxide (Cu2O) and cobalt doped (Co:Cu2O)thin films were prepared at varying doping by spray pyrolysis technique(SPT). X-ray diffraction patterns investigate t structural properties. Surface topography was studied by using Atomic Force Microscopy (AFM). Transmittance spectra were determined by a UV-Vis spectrophotometer and the...

The process of mixing different weight ratios of aluminium (2, 4, and 6 wt%) and zinc powder – as the target material – was conducted in a vacuumed quartz tube. The sintering processing was completed by leaving the powder for 2 h in an oven at 1000 ᴼC, facilitating the manufacturing of homogeneous alloys. The posterior, prepared by vacuum evaporati...

In this study, were investigated structural, optical properties and morphological ofZnO and Te-doped ZnO Nano-thin films deposited by Chemical spray pyrolysis(CSP) method. The structural properties of films were studied as pure and Te dopant ZnO at concentration 2 and 4%.The films were characterized by XRD to study the structure of films. It was ob...

There continues to be a need for an in-situ sensor system to monitor the engine oil of internal combustion engines. Engine oil needs to be monitored for contaminants and depletion of additives. While various sensor systems have been designed and evaluated, there is still a need to develop and evaluate new sensing technologies. This study evaluated...

Nano structured TiO2 was prepared utilizing spray pyrolysis deposition (SPD). The characterization of the deposited films was studied with Bi dopant. The XRD analysis indicated that films are polycrystalline with a preferred orientation along (110) direction. The AFM analysis shows a porous morphology structure. The optical properties were obtained...

undoped and Mn-doped zinc sulfide thin films were prepared on glass substrate by spray pyrolysis technique (SPT). XRD, AFM and UV-visible spectra measurements were done to explore the effect of doping on structural and optical properties of ZnS films. X-ray diffraction illustrates polycrystalline nature of the films increases via increasing Mn dopi...

Structural and optical properties of undoped NiO and Li doped NiO thin films at a volumetric content of (1% and 3%) by spray pyrolysis (SPT) were thoughtful. X-ray diffraction patterns indicate that deposited films are cubic polycrystalline with a dominant peak at (101) plane. The study assure that Li doping did not affect the structure or dominant...

We found a new value of supermassive black hole (SMBH) mass in the middle of type 1 Seyfert, NGC 4151 galaxy. In this Study, the image of NGC 4151 galaxy was deprojected to face-on, using spiral galaxy of face-on, and applied IRAF to calculate the ellipticity and position angle of major-axis. A two-dimensional (2D) Fast Fourier Transform (FFT) appl...

In this study, were investigated structural, optical properties and morphological of Te Nano-thin films with different thicknesses by Chemical spray pyrolysis (CSP) method. The structural properties of the films were studied as a Te dopant at 150-450 thicknesses. The films were characterized by XRD to study film structure. It was observed that the...

Nanostructured Tin oxide and Indium (In) doped SnO 2 were prepared by low cost and easy to manufacture method, which is a spray pyrolysis technique (SPT). Film transmittance was noticed to decrease from 67% to 56% (at 800 nm) on doping. XRD patterns revealed that tin oxide and 1% or 3% In:SnO 2 thin films are polycrystalline and preferred orientati...

In this study, were investigated structural, optical properties and morphological of Te Nano-thin films with different thicknesses by Chemical spray pyrolysis (CSP) method. The structural properties of the films were studied as a Te dopant at 150-450 thicknesses. The films were characterized by XRD to study film structure. It was observed that the...

2D-materials, especially transition metal dichalcogenides (TMDs) have drawn a lot of attention due to their remarkable characteristics rendering them a promising candidate for optical applications. While the basic properties are understood up to now, the influence of the environment has not been studied in detail, yet. Here we highlight a systemati...

2D-materials, especially transition metal dichalcogenides (TMDs) have drawn a lot of attention due to their remarkable characteristics rendering them a promising candidate for optical applications. While the basic properties are understood up to now, the influence of the environment has not been studied in detail, yet. Here we highlight a systemati...

In this thesis, we have first introduced a new setup for the reliable characterization of photoconductive antennas to be used in THz time-domain spectroscopy. Using this setup one can benchmark THz antennas with high precision. The intra-day reproducibility error is in the range of 1.9% while the reproducibility within 9 days is 2.6%. This includes...

By virtue of the surface plasmon resonance effect, plasmonic nanoparticles (NPs) can localize the light field and significantly enhance the performance of some optoelectronic devices. In this work, NPs are employed for an enhanced generation of terahertz radiation from LT-GaAs-based antennas. Therefore, we have prepared plasmonic TiN NPs by direct...

By virtue of the surface plasmon resonance effect, plasmonic nanoparticles (NPs) can localize the light field and significantly enhance the performance of some optoelectronic devices. In this work, NPs are employed for an enhanced generation of terahertz radiation from LT-GaAs-based antennas. Therefore, we have prepared plasmonic TiN NPs by direct...

2D-Materials especially transition metal dichalcogenides (TMD) have drawn a lot of attention due to their remarkable characteristics rendering them a promising candidate for optical applications. While the basic properties are understood up to now, the influence of the environment has not been studied in detail, yet. Here we present a systematic co...

We investigate the influence of the surface properties of a low-temperature-grown GaAs photoconductive antenna on the terahertz (THz) emission strength, using a specially designed THz time-domain spectroscopy system. The system allows us to excite six different positions along the 10 μm gap of a coplanar stripline antenna with a length of 10 mm wit...

Due to the effect of the surface plasmon resonance, plasmonic nanoparticles (NPs) can localize the light field and therefore enhance significantly the performance of optoelectronic devices. Here, NPs are employed for an enhanced generation of terahertz (THz) radiation from low temperature grown GaAs (LT-GaAs) -based antennas. For this purpose, we p...

This paper presents a significant effect of manganese ferrite nanoparticles (MnFe2O4 NPs) on the increase of the surface photoconductivity of semiconductors. Herein, the optical characterization of photo-excited carriers of silicon coated with MnFe2O4 NPs was studied by using THz time-domain spectroscopy (THz-TDs). We observed that silicon coated w...

Monolayers of transition-metal dichalcogenides such as WSe2 have become increasingly attractive due to their potential in electrical and optical applications. Because the properties of these 2D systems are known to be affected by their surroundings, we report how the choice of the substrate material affects the optical properties of monolayer WSe2....

We report on a terahertz (THz) time-domain system to characterize photoconductive THz emitters and detectors, that is designed for highest reproducibility. This system is excellently suited for studying the performance of THz sources and detectors in a systematic manner, either by varying the substrate materials or the geometrical parameters of met...

THz technology is becoming a fully developed technology which is used for fundamental research as well as for industrial applications. There are several approaches to optically generate THz radiation. Most of them are based on femtosecond lasers whose spectrum is transformed into the low THz frequency range (0.1 THz to 10 THz). This can be achieved...

Terahertz time-domain spectroscopy (THz-TDS) in the range of 0.5 to 2.0 THz was evaluated for discriminating among water contamination levels (0%, 0.1%, and 0.2%) in diesel engine oil (SAE 15W-40). The absorption coefficient demonstrated potential to discriminate among the three water contamination levels with significant differences among all thre...

Monolayers of transition-metal dichalcogenides such as WSe2 have become increasingly attractive due to their potential in electrical and optical applications. Because the properties of these 2D systems are known to be affected by their surroundings, we report how the choice of the substrate material affects the optical properties of monolayer WSe2....

The effect of ethanol and methanol solvent, and their mixture has been studied on the absorption and fluorescence spectra of laser dye Rhodamine B at concentration of (10-4) Molar at room temperature. The molar absorption coefficient has been determined for mixture which was (3.223) at wave number (18181.8 cm-1), Also the Quantum Efficiency of the...