S.H. Mohamed

Sohag University · Physics

Undoped and nitrogen (N)_doped Cu2O/CuO thin films were deposited via reactive DC magnetron sputtering. The deposition was carried out by sputtering the Cu targets under various Ar/N2/O2 gas flow ratios. The structural, optical, wettability, and photocatalytic performance of the deposited films were investigated. A simple cubic Cu2O crystallographi...

In2O3 and In2O3/CuO multilayer films were prepared using dc reactive magnetron sputtering for the possible usage as Vis-light photodetector. The structural, morphological, optical, and I–V characteristics were examined. X-ray diffraction revealed the presence of polycrystalline cubic In2O3 and monoclinic CuO phases. The EDAX elemental mapping of In...

ZrOxNy monolayer, ZrOxNy/Au bilayer, ZrOxNy/Au/TeO2 trilayer films were investigated for their hydrophilic properties and photocatalytic activities. ZrOxNy and Au layers were prepared by dc reactive magnetron sputtering whereas TeO2 layer was prepared by vapor transport technique. X-ray diffraction revealed the formation of monoclinic ZrO2 phase fo...

In this work, a high-performance WO3/Au/Cu2O-CuO heterojunctions was deposited via dc reactive magnetron sputtering, which displayed superhydrophilicity conversion and superior photocatalytic performance for the degradation of methylene blue. WO3, WO3/Cu2O-CuO, WO3/Au and WO3/Au/Cu2O-CuO heterojunctions were sputtered on precleaned glass and Si(100...

To study the influence of nitrogen on the properties of Sb2O3 nanostructures, a synthetic strategy was adopted to insert nitrogen into Sb2O3 lattice. Sb2O3 nanostructures were synthesized by vapor transport technique utilizing Ar plus O2 and N2 plus O2 gas mixes. EDAX inferred the presence of N besides to Sb and O for the films synthesized with N2...

Cu/Cu2O/CuO heterojunction were synthesized, using thermal oxidation under the flow of argon and oxygen gas mixture, as efficient photoelectrode for hydrogen generation. The Cu/Cu2O/CuO heterojunction were synthesized using un-roughed and roughed Cu foils. The resulting heterojunction samples were characterized using various techniques. The evaluat...

Recently, the photoelectrochemical (PEC) water-splitting reaction for hydrogen (H2) production has been a competitive research route to realize clean and sustainable electric power. In this work, copper oxide (CuO) and PbS thin films were fabricated on commercial glass, respectively, using the techniques of successive ionic-layer adsorption and rea...

WNxOy can be regarded as new potential candidates for photocatalysis because of their lower band gaps compared with WO3 photocatalyst. In this study WNxOy with different nitrogen content were prepared via oxidation of dc sputtered tungsten nitride films at 500 °C and for various times of 1, 1.5, and 2 h. X-ray diffraction patterns indicated that th...

Sb2O5 nanorods were synthesized using vapor transport as a photoelectrode for hydrogen generation. XRD revealed the formation of cubic Sb2O5 crystallographic phase and no other impurity peaks were observed. The SEM images revealed randomly oriented wedge shaped nanorods morphology. The optical band gap, the refractive index and extinction coefficie...

This research focuses on the synthesis of a new composite material, As2O3-poly(1H-pyrrole) (P1HP), for the generation of hydrogen gas. The novelty lies in the utilization of eco-friendly and cost-effective seawater as the source of hydrogen gas. The study aims to develop a sustainable and efficient approach for hydrogen production using this novel...

N:TiO2 thin films were sputtered on glass, Si(100) and FTO substrates at various nitrogen to total reactive gas flow ratio (η). Tetragonal anatase phase were indexed for all prepared films. The incorporation of nitrogen into the TiO2 film did not have significant influence on the crystal structure. Slight decrease in the peak intensities and grain...

TiO 2 thin films on polymethyl methacrylate (PMMA) substrates were prepared on Al foils using reactive dc magnetron sputtering followed by transformation to the PMMA substrates via chemical method. The films were prepared at different temperature preparation routes of 100, 150 and 200 °C. XRD revealed the formation amorphous structure for films pre...

In this work, the synthesis of undoped and Sn-doped ZnO nanowires using vapor transport technique is reported. The effects of Sn content on morphological, structural, optical, electrical and sensing characteristics of ZnO nanowire films were examined by utilizing various techniques. X-ray diffraction inferred that all undoped and Sn-doped ZnO films...

In this work, the structural, morphological, electrical and optical properties of Bi2–xTe3Fex (x = 0, 0.3 and 0.5 at%) thin films were investigated. X-ray diffraction investigations revealed the formation of hexagonal Bi2Te3 structure for undoped and Fe-doped films. Scanning electron microscopy observations revealed an increase in the average grain...

Highly flexible photodetector with a great efficiency related to its highly response to the photons is prepared with simple techniques and low costs. This optoelectronic is based on the photografting acrylic acid is utilized to adjust the surface of PET films to fasten with silver ions. Ag and Ag2O were formed onto the surface of the photografting...

Pure In2O3 and mixed Mn2O3–In2O3 nanomaterials were synthesized via vapor transport method. The X-ray diffraction patterns demonstrated the cubic crystalline phase for pure In2O3 sample, whereas a combination of cubic In2O3 and orthorhombic Mn2O3 phases were observed for the mixed sample. The scanning electron microscopy images revealed the formati...

The work reports on the preparation of polyaniline/lead iodide optoelectronic photodetector on antimony tin oxide (ATO) glass (PANI/PbI2/ATO) for providing a low‐cost light sensor in the UV, Vis, and near IR regions (wide optical range photodetector). The deposition of PbI2 nanoparticles was carried out on the surface of PANI using the ionic adsorp...

The current work concerns with the effects of cupper sulfide (CuS) buffer layer on morphological, structural and optical properties of tellurium dioxide (TeO 2 ) nanostructured thin films synthesized by vapor transport method. Single crystalline tetragonal TeO 2 crystallographic phase with enhanced peak intensity and crystallinity for CuS/TeO 2 fil...

This study describes the preparation and characterization of glass/poly-3-methyl aniline (P3MA)/PbS quantum dot (QD) optoelectronic photodetector to detect and sense the light in broad spectral regions of UV, Vis, and NIR. This work is carried out to solve the drawbacks of other studs that prepare detectors in just one or two optical regions. Previ...

Polyaniline (PANI) and PANI/Ag2O/Ag composites I and II were prepared under different AgNO3 oxidant concentrations using the oxidative photopolymerization method. The chemical structure and optical, electrical, and morphological properties were determined for the prepared nanocomposite. The PANI/Ag2O/Ag composite II has the optimum optical properti...

In this work, TiO2/TiN/TiO2 multilayer nanostructured films are prepared for coupling the plasmonic characteristics of TiN with the semiconducting characteristics of TiO2. X-ray examinations revealed the existence of mixed tetragonal crystalline phases of anatase and rutile TiO2. Small and uniformly distributed grains with grain sizes ranged from 5...

This study provides hydrogen gas fuel as a renewable energy source. The production of H2 was carried out through the photocatalytic decomposition of sewage water using highly efficient poly(m‐toluidine) (PMT)/rolled graphene oxide (roll‐GO) as photoelectrode. The preparation of PMT thin film was carried out on glass using the in situ electropolymer...

In this study, ZnS–ZnO hybrid nanowires (NWs) were synthesized using vapor transport synthesis method. The structure, morphology, optical properties, photoluminescence and thermogravimetric analysis of the samples were studied. Scanning electron microscopy images and X-ray diffraction pattern revealed that the ZnS–ZnO hybrid nanostructures are nano...

This work reports on H2 fuel generation from sewage water using Cu/CuO nanoporous (NP) electrodes. This is a novel concept for converting contaminated water into H2 fuel. The preparation of Cu/CuO NP was achieved using a simple thermal combustion process of Cu metallic foil at 550 °C for 1 h. The Cu/CuO surface consists of island-like structures, w...

This work concentrated on the synthesis of undoped and Cu-doped ZnO nanowires (NWs) by vapor transport method as well as on their physical and chemical characterizations. All X-ray diffraction patterns were indexed to ZnO single phase of hexagonal structure, and no Cu or Cu compounds characteristic peaks were observed. The evaluated Cu at.% was pro...

Undoped and Mn doped Bi2Te3 (x = 0, 0.05 and 0.10 at%) thin films were prepared via thermal evaporation method from their bulk alloys. X-ray diffraction revealed the presence of hexagonal Bi2Te3 crystalline phase only in all undoped and Mn doped films. EDAX quantitative analysis revealed that the effective Mn doping is close to that of the intended...

TiN films with different thicknesses (17.9–102.8 nm) were prepared using rf magnetron sputtering to study the effect thickness on the plasmonic, electrical, and optical properties. X-ray diffraction revealed the amorphous-like structure for thinner films with thicknesses lower than 50.3 nm, whereas polycrystalline of face-centered cubic TiN structu...

The thermal oxidation of CuS powder was examined under flow of nitrogen and dry air using thermogravimetry/differential thermal analysis. After 473 K, the oxidation of CuS occurred as a weight loss and accompanied with two overlapped exothermic peaks. The melting temperature delayed due to the formation of oxide and sulphate on the surface of the p...

ZnO thin films were prepared by chemical vapour transport method in inductively coupled plasma (ICP). The films were synthesized at different substrate positions and various oxygen/argon ratios. X-ray diffraction (XRD) revealed that all the synthesized films at different positions are mixture of hexagonal ZnO and hexagonal Zn phases. The relative p...

Undoped and In doped substoichiometric CdO nanostructured films were prepared via vapor transport method. Mixed phases of hexagonal Cd and cubic CdO were obtained. No peaks related to In or indium oxides were observed in the In doped CdO pattern. Net-like assembles of nanowires were observed for undoped CdO sample whereas a regular morphology of eq...

The aim of this work was to examine the influence of radio frequency (rf) power on ZnO films synthesized by means of chemical vapor transport technique in inductively coupled plasma (ICP). As the rf power increased, with a fixed processing time of only 8 min, the temperature inside the reactor tube, the thickness and surface roughness of the formed...

The present work demonstrates the structural and photophysical properties of mixed zinc tin oxide (Zn:SnO 2) nanowires (NWs) synthesized via vapor transport technique with Zn content of 10, 25 and 50 wt%. The XRD spectra reveals the tetragonal phase of SnO 2 for 10 wt% Zn content, whereas a combination of tetragonal SnO 2 and hexagonal ZnO phases w...

The original version of the article unfortunately contained an error in the author name. In the author group the correct name is “Sodky H. Mohamed”.

Titanium oxynitride (TiOxNy) films capped with 10 nm titanium oxide (TiO2) layer were prepared using reactive direct current magnetron sputtering from pure Ti target. Part of the samples was annealed. Energy dispersive analysis of X-ray revealed that all the samples contain nitrogen and the incorporation of nitrogen into the oxynitrides is not line...

TiN/TiOxNy bilayer films with various TiN thicknesses were prepared using direct current (d.c.) reactive magnetron sputtering. The ratio of N/O in the bilayer films increased with increasing TiN top layer thickness. The observed crystalline peaks for the bilayer films, for different TiN layer thicknesses, were indexed to anatase TiO2 with tetragona...

A new structure to control the electromagnetic waves has been successfully designed for smart windows applications. The present photonic crystals (PCs) smart window is designed from a unit cell of two different materials such as A (metal) and B (superconductor) of thicknesses that repeated for N periods. The numerical results are investigated based...

In the present work, we have obtained a new design for sensing the black body radiation. In this work we designed one-dimensional photonic crystals incorporates that a high-temperature superconducting material as a defect layer. The numerical results are essentially obtained based on the fundamental characteristic matrix method. Also, the results s...

In this paper, we theoretically investigate the transmittance characteristics of one-dimensional defective photonic crystal in microwave radiations based on the fundamentals of the characteristic matrix method. Here, the defect layer is magnetized plasma. The numerical results show the appearance of defect peaks inside the Photonic Band Gap. The ex...

Transparent conductive CdO/Cu/CdO multilayer films were prepared using rf plasma magnetron sputtering and electron beam evaporation techniques. The CdO layers were prepared using rf plasma magnetron sputtering, while the Cu interlayer was prepared by electron beam evaporation technique. The Cu layer thickness was varied between 1 and 10 nm. The str...

Nanocrystalline Sn1-xFexO2 (where x = 0, 0.01, 0.02, 0.03 and 0.04) powders have been successfully synthesized by the hydrothermal method followed by sintering at 1000 °C for 3 h. The morphology and structure of the samples have been analyzed by field emission scanning electron microscope and X-ray diffraction, respectively. X-ray diffraction resul...

Zinc selenide (ZnSe) thin films with different thicknesses were evaporated onto glass substrates using the thermal evaporation technique. X-ray diffraction analysis confirmed that both the film and powder have cubic zinc-blende structure. The fundamental optical parameters like absorption coefficient, extinction coefficient and band gap were evalua...

Zirconium oxynitrides are excellent candidates for many technological applications, especially decorative applications. For the use of zirconium oxynitrides as decorative coatings, the thermal stability is of crucial importance. Therefore zirconium oxynitrides, containing both oxygen and nitrogen, were prepared by pulsed d.c. reactive magnetron spu...

In this study, the evaporation condensation of CdS was carried out in a quartz tube with an open end. The synthesis was carried out on Au coated Si(100) and quartz substrates. The Au coated Si and quartz substrates were put approximately 1 cm and up to 25 cm away from the alumina boat. It was observed that the materials deposited on the substrates...

Undoped, Cu doped ZnO and Cu2O/ZnO nanoswires were synthesized by using a simple vapor phase transport process. The corresponding morphology, structure, and chemical composition were investigated using scanning electron microscope, X-ray diffraction and energy dispersive analysis of X-ray, respectively. Although XRD examination of Cu doped ZnO reve...

Leaves like CdS films were grown on catalyst-free Si(100) and quartz substrates by vapor transport of CdS powder at 850°C. Randomly aligned nanoleaves with different shapes were observed. X-ray diffraction analysis revealed that the leaves like CdS is a single phase nature with hexagonal crystal structure. The optical functions of CdS films have be...

Undoped and Fe-doped TiO2 nanostructures have been successfully grown on Pt-coated quartz and Si (100) substrates using vapor-liquid-solid (VLS) growth method. The scanning electron microscopy (SEM) image showed that TiO2 grew in nanowires (NWs) with diameters of 200–400 nm and lengths greater than 12 μm. However, the morphology of Fe-doped TiO2 co...

Thallium lead telluride (Tl4PbTe3) was prepared by direct reaction of high purity elemental thallium, lead and tellurium. Tl4PbTe3 thin films were prepared on well cleaned glass and silicon (100) substrates by electron beam evaporation. X-ray diffraction studies revealed that the films with low thickness were amorphous and the crystallinity increased...

V2O5 nanowires (NWs) were grown on Si (100) and quartz substrates using evaporation–condensation method with the VLS growth technique. The chemical composition of the synthesized nanostructures was analyzed using energy dispersive analysis of X-ray (EDAX). The surface morphology and crystal structure of the synthesized NWs were characterized by sca...

Plasma-immersion ion implantation (PIII) is a potent method to obtain hard and wear-resistant surface on Ti by nitrogen implantation. This presentation is one part of a sequence of experiments to optimize the microstructure and physical properties of TiN through adapting the plasma-processing parameters. In this work, nitrogen ions were implanted i...

Undoped and Ga-doped In2O3 nanowires (NWs) were synthesized by using vapor-liquid-solid (VLS) growth and were characterized as transparent conductive oxides for future generations of optoelectronic devices. A low amount of Ga was obtained due to the low solubility of Ga2O3 in In2O3. The incorporation of Ga into In2O3 nanowires decreases the grain s...

Growth of Ga2O3 nanowires (NWs) was carried out by vapor–liquid–solid (VLS) on silicon substrates using Pt as a catalyst. Structural analysis revealed that the Ga2O3 NWs are single phase nature with monoclinic β-Ga2O3 crystal structure. The optical functions of β-Ga2O3 NWs films have been determined by ellipsometry investigations from 300–2100 nm....

(BaTiO3)1−x(CeO2)x (with x = 0, 1, 3, 5.7 and 16 at.%) thin films were prepared by electron beam evaporation method. According to X-ray diffraction, nanosized and amorphous Ce-doped barium titanate thin films were obtained. The crystallinity diminished as Ce content increased. The increase in the Ce slightly shifts the absorption peaks at 433–450 a...

Chalcogenide bulk alloys of Ge10AsxTe90−x (x = 20, 25, 30, 35, 40, 45 and 55) system were prepared by the conventional melt quench-technique. The dc electrical conductivity σ and thermoelectric power (TEP) measurements were carried out in the temperature ranges from 83 to 353 K and from 253 to 353 K, respectively. The variations of both σ and TEP w...

The Fe2O3–TiO2 mixed nanostructure was grown from Fe/Ti metallic source using evaporation–condensation method. The formation of mixed Fe2O3–TiO2 nanostructures was confirmed by energy dispersive analysis of X-ray and X-ray diffraction analysis. The scanning electron microscopy showed that the samples consisted of large amounts of two kinds disperse...

Nitrided surfaces and composition gradients in thin films exhibit interesting mechanical, electrical, and optical properties. Therefore, amorphous hydrogen-free silicon (a-Si) thin films were deposited by electron beam evaporation and subsequently nitrided by an inductively coupled rf plasma. The effects of successive plasma-processing cyclic time...

Nanocomposite TiO2-ZnO thin films, with different ZnO content, were deposited by electron-beam evaporation on glass and Si(1 0 0) substrates. The resulting films were annealed in air for 1 h at 450 °C. X-ray diffraction revealed the presence of monoclinic β-TiO2 and hexagonal ZnO for the films prepared with ZnO content of 0 at.% and 100 at.%, respe...

Glasses with compositions 60B2O3–40PbO, 60B2O3–40Bi2O3, and 60B2O3–30Bi2O3–10PbO have been prepared and studied by differential thermal analysis. The crystallization kinetics of the glasses was investigated under non-isothermal conditions. From dependence of the glass transition temperature (T g) on the heating rate, the activation energy for the g...

Titanium nitrides have good mechanical, biomedical and optical properties, therefore they are used to harden and protect cutting and sliding surfaces and as a non-toxic exterior for bio-medical applications. Nitrogen plasma immersion implantation (PIII), in which the diffusion of nitrogen from low pressure r.f. plasma is combined with the implantat...

SnO2 dendrites–nanowires were grown on Au coated Si substrates using evaporation condensation method. The morphology, structural, chemical composition and thermal analysis were examined using scanning electron microscopy, X-ray diffraction, energy dispersive analysis of X-ray and Fourier transformation infrared spectroscopy, and thermal gravimetric...

CdS doped TiO2 thin films (with CdS content=0, 3, 6, 9 and 12 at%) were grown on glass substrates. The X-ray diffraction analysis revealed that the films are polycrystalline of monoclinic TiO2 structure. The microstructure parameters of the films such as crystallite size (Dnu) and microstrain (e) are calculated. Both the crystallites size and the m...