Mohamed M Rashad

Mohamed M Rashad
Central Metallurgical Research and Development Institute | CMRDI · Department of Electronic and Magnetic Materials

Professor
Prof of Materials Science and Engineering , Central Metallurgical Research and Development Institute, Cairo, Egypt

About

242
Publications
91,976
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Introduction
Rashad is Prof. of Materials Science and Engineering at Central Metallurgical Research and Development Institute (CMRDI), Egypt. Rashad awarded 5 state prizes in advanced materials technology as well as environmental studies. Rashad works deals with nanomaterials and nanotechnology, energy production and storage, magnetic materials, piezoelectric materials, optical materials, fuel cell, electronic & magnetic devices and smart materials
Additional affiliations
Education
July 2000 - July 2002
Ain Shams University
Field of study
  • Inorganic chemistry
September 1993 - March 1997
Mansoura University
Field of study
  • Chemistry
September 1985 - May 1989
Mansoura University
Field of study
  • Chemistry

Publications

Publications (242)
Article
In recent years, the strong-base free synthesis has attracted much interest due to their numerous advantages as being eco-friendly techniques. Herein, we successfully synthesized spinel cobalt ferrites, with compositions MxCo1-xFe2O4 (x = 0.0, 0.1, 0.3 and 0.5) where M is a transition metal ion as Mn²⁺ and Zn²⁺, by a novel strong-base free approach...
Article
Spinel Li2Co1–xCuxTi3O8 nanopowders (x = 0, 0.25, 0.5 molar ratios) were synthesized via a sol–gel auto-combustion scheme. The preparation conditions like annealing temperature, Cu2+ ion substituted on the crystallinity, microstructure and chemical composition were inspected using X-ray diffraction, X-rays photoelectron spectroscopy and field emiss...
Article
Full-text available
Sol- gel is used for preparation of zinc aluminate nanomaterials doped with copper in presence of glycine as a chelating agent with different molar ratios (0.0, 0.2, 0.4, 0.6, 0.8, and 1.0) and co-doped with C/Cu (II). The formed nano- powders were investigated using EDX, XRF, XRD and HR-TEM and studying their optical properties using UV spectrum a...
Article
Full-text available
At varying temperatures ranging from 25 0C to 75 0C, nanocrystalline zinc oxide ZnO films were customized onto indium doped tin oxide (ITO) substrates based on aqueous solutions of zinc nitrate. The electrodeposition technique was used to achieve this procedure. To grasp the deposition strategy, linear sweep voltammetry and chronopotentiometry proc...
Article
Full-text available
Purpose: To determine the cytotoxic, bronchorelaxant, spasmolytic, antidiabetic, α-glucosidase, acetylcholinesterase, butyrylcholinesterase, α-chymotrypsin and lipoxygenase inhibitory attributes of methanol and dichloromethane extracts of the aerial parts of Breynia distachia. Methods: The dichloromethane and methanol extracts of the aerial parts o...
Article
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A unique approach for customizing nanowire zinc oxide thin films on nanoporous anodic Al2O3 (nPAA) was developed in this study, which included the use of an electrochemical procedure to manufacture nanowire zinc oxide thin films on nanoporous anodic Al2O3 (nPAA). With a single step of anodization at 25 oC and low voltage, we were able to produce a...
Article
Aside from perovskite crystallization effectuation, the hole transport layer (HTL) acting a significant role in regulating charge transportation for inverted perovskite solar cells (PSCs). Herein, we show effective p-i-n PSCs based on solid solution-coating Kesterite Cu2ZnSnS4 (CZTS) by one-step heating as HTL in an air (O2) and nitrogen (N2) envir...
Article
Full-text available
Spinel cobalt ferrite/hexagonal strontium hexaferrite (2CoFe2O4/SrFe12−2xSmxLaxO19; x = 0.2, 0.5, 1.0, 1.5) nanocomposites were fabricated using the tartaric acid precursor pathway, and the effects of La3+–Sm3+ double substitution on the formation, structure, and magnetic properties of CoFe2O4/SrFe12−2xSmxLaxO19 nanocomposite at different annealing...
Article
Spinel nickel-cobalt sulfide (NiCo2S4) supported on reduced graphene oxide (rGO) was fabricated through a facile one-step hydrothermal method for energy storage applications. The distribution of the NiCo2S4 nanoparticles on the rGO surface was found to improve the supercapacitive performance of the assembled device. The NiCo2S4/rGO nanocomposite ex...
Article
Full-text available
In this report, lanthanum strontium manganite at different Sr2+ ion concentrations, as well as Gd3+ or Sm3+ ion substituted La0.5−YMYSr0.5MnO3 (M = Gd and Sm, y = 0.2), have been purposefully tailored using a sol gel auto-combustion approach. XRD profiles confirmed the formation of a monoclinic perovskite phase. FE-SEM analysis displayed a spherica...
Article
Full-text available
In this report, Yb0.8Ca0.2MnO3, Dy0.8Ca0.2MnO3, and Nd0.8Ca0.2MnO3 perovskite compounds have been felicitously elaborated based on a fertile cost-effective solid-state reaction strategy. Dy0.8Ca0.2MnO3 and Nd0.8Ca0.2MnO3 powders were found to manifest orthorhombic structure, whereas the Yb0.8Ca0.2MnO3 sample was found to demonstrate hexagonal struc...
Article
Full-text available
As proficient photovoltaic devices, dye-sensitized solar cells (DSSCs) have received considerable consideration in recent years. In order to accomplish advanced solar-to-electricity efficiency and increase long-term functioning stability, improvements in the configuration structure of DSSCs are essential, as is an understanding of their elementary...
Article
Full-text available
Lithium ion-substituted hexagonal strontium ferrite (Sr1−xLi2xFe12O19, where x = 0.1, 0.2, and 0.3) powders have been successfully fabricated using tartrate precursor route. The impact of Li+ content, as well as annealing temperature on the phase evolution, microstructure, and magnetic performance, was monitored by X-ray diffraction profile, scanni...
Article
In the current report, nitrogen and carbon co-doped molybdenum disulfide (MoS2) nanoflakes were prepared via a simple single-step hydrothermal scheme. The structural, morphological, and chemical composition of the as-synthesized material was purposefully depicted using X-ray diffraction profile, scanning electron microscopy, and high-resolution tra...
Chapter
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The 3D-perovskite halides have gained a considerable reputation versus their counterpart semiconductor materials since they achieved a remarkable high-power conversion efficiency of 25.2% within a decade. Perovskite solar cells also have some problems as lattice degradation and sensitivity against moisture, oxygen, and strong irradiation. The perov...
Article
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The present work is concerned with studying the electrical and dielectric properties of a single, binary, and ternary nanocomposite of Mn3O4 (M), TiO2 (T), and reduced graphene oxide (RGO). The electrical properties of the investigated systems were studied via dc-, ac- conductivity, dielectric, and impedance spectroscopy (EIS) measurements. The ele...
Preprint
Full-text available
Lithium ion substituted hexagonal strontium ferrite (Sr 1-x Li 2 x Fe 12 O 19, where x = 0.1, 0.2, and 0.3) powders have been felicitously fabricated using tartrate precursor scheme. The impact of the Li ⁺ content, as well as the annealing temperature on the phase evolution, microstructure and magnetic performance, was commanded by X-ray diffractio...
Article
Full-text available
Graphene (G) and ternary nanocomposites of Mn3O4, TiO2, and reduced graphene oxide(rGO) electrodes have been prepared for supercapacitor applications. The as-synthesized samples were characterized using several techniques including XRD, SEM, TEM, XPS, and Raman spectroscopy. Electrochemical characterizations were studied via cyclic voltammetry (CV)...
Article
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A magma S that meets the identity, xy·z = zy·x, ∀x, y, z ∈ S is called an AG-groupoid. An AG-groupoid S gratifying the paramedial law: uv · wx = xv · wu, ∀ u, v, w, x ∈ S is called a paramedial AGgroupoid. Every AG-grouoid with a left identity is paramedial. We extend the concept of inverse AG-groupoid [4, 7] to paramedial AG-groupoid and investiga...
Article
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Valuation of Portland cement hydration using non-destructive techniques at early age is of great interest for predicting its thermal and durability characteristics. The acoustic emission (AE) technique is verified to be a high-quality non-destructive tool for real-time monitoring of structural micro-changes during the lifetime of Cement-based mater...
Article
This study approved a microemulsion method to successfully prepare nanocrystalline (cobalt or nickel) iron tungstate powders (Nix or Cox)Fe1-XWO4 where X=0, and 0.5). The powders were calcined within a temperature of 600 ℃ for 6 hours and optimized at pH 10. The change in the crystal structure, microstructure, crystallite size, optical properties,...
Article
Samarium titanate nanopowders have been successfully synthesized from their corresponding precursors through a facile modified sol–gel route.
Article
Due to rapid industrialization, the presence of heavy metals in water and wastewater is a matter of environmental concern. Though some of the metals are essential for our system but if present beyond their threshold limit value (TLV), they are harmful and their treatment prior to disposal becomes inevitable. The present communication has been addre...
Chapter
In the current study, an incisive review of the recent noticed advances implemented to improve the net efficiency of PSCs through using metal oxide nanoparticles as the charge transport materials is delivered, focusing on the architectures as well as the different fabrication pathways based on solution processes for metal oxides as transport materi...
Article
Four novel polymers have been investigated as promising solution processable, dopant-free polymeric hole-transporting materials (HTMs) for efficient and stable perovskite solar cells. The poly(1-(4-hexylphenyl)-2,5-bis(5-methylthiophen-2-yl)-1H-pyrrole) p(hPhDTP), poly(1-(4-methoxyphenyl)-2,5-bis(5-methylthiophen-2-yl)-1H-pyrrole)p(mPhDTP), poly(3-...
Article
Four novel polymers have been investigated as promising solution processable, dopant-free polymeric hole-transporting materials (HTMs) for efficient and stable perovskite solar cells. The poly(1-(4-hexylphenyl)-2,5-bis(5-methylthiophen-2-yl)-1H-pyrrole) p(hPhDTP), poly(1-(4-methoxyphenyl)-2,5-bis(5-methylthiophen-2-yl)-1H-pyrrole)p(mPhDTP), poly(3-...
Article
Full-text available
This study investigates the electrochemical evaluation of the activated carbon (AC) prepared from pomegranate peels which were collected, dried, carbonized and finally activated with KOH at different temperatures. The characterization of the as-prepared AC revealed an amorphous type of carbon and densely layer-stacking sheets with an interconnected...
Article
Despite the priority of titanium dioxide (TiO2) as electron transport layers (ETLs) for perovskite solar cells (PSCs), some questions are still needed to be solved to achieve better high-power conversion efficiency (PCE). Herein, TiO2 nanotube (TD-NT) with network structures has been obtained through an inexpensive hydrothermal strategy. The obtain...
Article
Full-text available
A TiO2/GO/CuFe2O4 heterostructure photocatalyst is fabricated by a simple and low-cost ball-milling pathway for enhancing the photocatalytic degradation of chlorinated pesticides under UV light irradiation. Based on the advantages of graphene oxide, TiO2, and CuFe2O4, the nanocomposite exhibited visible light absorption, magnetic properties, and ad...
Article
Full-text available
Hybrid perovskites are organometal halide materials that are attractive to the researchers owing to impressive physical properties like absorption coefficients. Controlled formation of perovskite crystal during the preparation process is key to achieving better morphological features, thereby influencing the material’s properties. In this paper, we...
Article
Full-text available
samples were characterized by XRD, FT-IR, BET, TEM, , Photoluminescence (PL), and UV-vis absorption techniques. X-ray diffraction (XRD) and FT-IR confirmed the formation of rGO-M nanocomposites and transmission electron microscopy (TEM) study revealed that M nanomaterials with average size 75 nm were embedded on rGO surface. Under visible light ill...
Article
Lead-free piezoelectric thin films of composition (1-x)Bi0.5Na0.5TiO3-xBi0.5K0.5TiO3-0.03SrZrO3 (x = 15, 17.5, 20 and 22.5%) have been created using the sol-gel spin coating approach over a Pt/Ti/SiO2/Si substrate. The X-ray diffraction profiles suggest that a remarkable transition from tetragonal to rhombohedral-phase passing by a morphotropic pha...
Article
Full-text available
Multiferroic of strontium titanate and magnesium ferrite nanocomposites with chemical formula x SrTiO3 + (1 − x) MgFe2O4; x = 0, 0.6, 0.7, 0.8, 0.9 and 1.0 have been synthesized through sol gel auto-combustion pathway. The blending is based on ball milling method. The lattice parameters and crystallite size of the combination nanocomposites were co...
Poster
Full-text available
The exploration of alternative low-cost molecular hole-transporting materials (HTMs) for both highly efficient and stable perovskite solar cells (PSCs) is a relatively new research area. Herein, we demonstrated copolymer poly(1‐(4‐hexylphenyl)‐2,5‐di(thiophene‐2‐yl)‐1H‐pyrrole) (PHDP) as hole-transporting materials (HTMs) used in perovskite solar c...
Article
New series of spinel LiNi0.25Fe0.2Mˊ0.05Mn1.5O4 (Mˊ = Cu, Mg or Zn) cathode materials have been purposefully tailored using sol-gel auto-combustion method at low annealing temperature ~ 700°C for 3 h. The XRD analysis showed that all substituted (LNFMO-Mˊ) samples are comported with the main structure of undoped (LNFMO) with crystalline disordered...
Article
Full-text available
Nanocrystalline spinel zinc ferrite ZnFe2O4 thin film has been studied and synthesized via the electrodeposition-anodization process. Electrodeposited ZnFe2 alloys were obtained from aqueous sulphate bath. The resulted alloys were electrochemically oxidized in strong alkaline solution (1 M KOH) at room temperature to the analogous hydroxides. The e...
Article
Nanocrystalline bismuth ferrite BFO; BiFeO 3 and manganese sillenite, BMO; Bi 12 MnO 20 (BMO) powders have been successfully elaborated using a facile co-precipitation approach. The formed materials were examined using X-ray diffraction analysis (XRD), field emission scanning electron microscopy (FE-SEM). Furthermore, the change in the optical prop...
Article
Constructing electrode materials with high energy densities are the effective way to develop asymmetric supercapacitor devices. Therefore, the inlay of conductive materials into pseudo‐capacitive constituents is a practical approach to increase the performance of supercapacitors electrodes. Herein, we declare a facile one‐step as an economic strate...
Article
Two AB2O4 spinel structures have been synthesized by alternating the A- and B-site atoms in the forms (MnCo2O4 and CoMn2O4) through implementing the low-cost co-precipitation technique. Structural investigation results indicated the pronounced phase transformation from cubic of MnCo2O4 to the tetragonal spinel of CoMn2O4, while no change in the cry...
Article
Lanthanum replaced strontium M-type ferrite particles, Sr1−xLa2x/3Fe12O19 (where x = 0.0, 0.1, 0.2 and 0.3) have been elaborated using tartrate precursor pathway. The manipulation of different synthesis conditions was assayed. Typical, Sr²⁺ ion surplus and La³⁺ ion substitution was discovered to develop the phase evolution and the microstructure of...
Article
Full-text available
Inspired by their distinctive properties, transition metal phosphides have gained immense attention as promising electrode materials for energy storage and conversion applications. The introduction of a safe and large-scale method of synthesizing a composite of these materials with carbon is of great significance in the fields of electrochemical an...
Article
Synthesis of TiO2 photocatalysts with better activity via facile methods is desired to facilitate their applications. Here, we report a facile method to synthesize layered titanate/rutile heterojunction photocatalysts showing activity higher (up to twice) than that of a benchmark P25 TiO2 under irradiation with a solar simulator. In this method, a...
Article
Magnesium yttrium oxide (MgO–Y2O3) nanocomposites have been purposefully tailored using a oxalate precursor pathway. Commonly, MgO-Y2O3 nanocomposites possessed a significant technological challenge in electroceramics; particularly remarkable as the anode material for solid oxide fuel cells (SOFC). In this regard, different weight ratios,% of MgO a...
Article
Full-text available
Typically, low cost as well as stability factors of the organo-metal halide perovskite solar cells based on inorganic hole transport layers (HTLs) have been the focus of intense research over the past few years. Accordingly, the power conversion efficiencies have rapidly been improved to ~ 20% with high stabilities. Therefore, this review covers th...
Article
Full-text available
Various dc conduction mechanisms and high frequency (1MHz up to 3 GHz) dielectric properties have been studied for the particulate and 0-3 core shell composites. X -ray diffraction has been used to identify the structural properties. Tetragonal and cubic structures for PZT and ferrite respectively were appeared either in the pure form or in composi...
Article
Full-text available
Nanostructured powders of Sr1.96MgSi2O7:Eu 2+0.01, R 3+0.01 (R3+ = Er3+, Tm3+ and Tb3+) have been fabricated via urea combustion technique. XRD results implied that tetragonal Sr2MgSi2O7 was the major phase whereas monoclinic Sr2SiO4 and SrSiO3 were the minor phases. Meanwhile, field emission SEM textures showed the hollow spherical network-like sh...
Article
Full-text available
Tin-Zinc-Oxide nanocomposites (SZO) with various Sn:Zn ratios were successfully fabricated and tested as electron transport layer (ETL) in perovskite solar cells (PVSCs). The fabricated nanocomposites showed good crystallinity, good contact between layers, good electrical conductivity, and favorable light absorption, resulting in an enhancement in...
Article
Nanocrystalline spinel nickel ferrite NiFe2O4 thin film has been studied and synthesized via the electrodeposition-anodization process. Electrodeposited NiFe2 alloys were obtained from aqueous sulphate bath. The formed alloys were electrochemically oxidized (anodized) in aqueous (1 M KOH) solution, at room temperature, to the corresponding hydroxid...
Article
Full-text available
Sulfide-based chalcogenide quaternary semiconductors Cu2MSnS4 where M = Zn, Mn, Ni and, Co have emerged as a promising material for photovoltaic application due to their opto-electrical properties, friendly environment and earth-abundant composition. Herein, we report on the surfactant-assisted, solvent-free, hydrothermal synthesis of Cu2MSnS4 (M =...
Conference Paper
Plasmonic absorbers have been a matter of research in the last few years. The interest of nanophotonic applications was mainly in the visible and infrared regimes but very few focused on ultraviolet regimes. Metal-insulator-metal based plasmonic absorber is proposed to work in the ultraviolet regime. In this paper the spectral absorptance and refle...
Article
Full-text available
Spinel LiMn1.5Ni0.5O4 (LNMO) and LiMn1.5Ni0.25M0.25O4(M=Co (LNCMO) or Fe LNFMO) have been purposefully tailored using a sol–gel auto-combustion method at low annealing temperature. Well crystalline disordered spinel Fd3m structure was formed. The particles of LNMO sample evinced a regular octahedron shape-like morphology with wide particle size dis...
Article
Full-text available
Barium Y-type hexaferrite Ba2Co2Fe12O22 nanopowders have been purposefully tailored using two different chemical wet methods namely; sol gel auto-combustion (SGA) and co-precipitation (CP) routes. The impact of the pre-annealing and the annealing temperature of the formed precursors synthesized using two strategies on the structural, microstructure...
Article
Full-text available
В данной работе была исследована тонкая пленка нанокристаллического феррита никеля NiFe2O4, синтезированная методом электроосаждения-анодирования. Электроосажденные сплавы NiFe2 получали из водной сульфатной ванны. В водном (1 М КОН) растворе при комнатной температуре данные сплавы подвергали электрохимическому оксидированию (анодированию) до соотв...
Article
Full-text available
Ni-substituted zinc sulfide Zn1−xNixS (x = 0.0–0.8) nanopowders have been purposefully assembled using hydrothermal strategy based on inexpensive chloride salts and thiourea as sulfur sources. By X-ray diffraction, a hexagonal wurtzite structure with preferential orientation along the (0 0 8) plane was recognized at hydrothermal temperature 150 °C...
Article
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Nowadays, barium strontium titanate (BST; Ba0.5Sr0.5TiO3) as a versatile material is a prospect candidate in different electronic and magnetic applications. In this study, cubic BST nanoparticles have been prosperity fabricated based on the oxalate precursor method. Afterwards, the formed precursor powders are further annealed at temperature 1000 °...
Chapter
Full-text available
The power conversion efficiencies (PCEs) of perovskite solar cells (PSCs) have been reached the initial value when they emerged as dye-sensitized solar cell (DSSC) in 2012. Immediately, the interests were drawn in this field worldwide. The researchers have improved the efficiency of PSCs up-to 22%, which was originally started from its initial valu...