Safwat AbdelHaleem Mahmoud

• Professor. https://orcid.org/0000-0003-3323-2644
• Professor (Full) at Minia University

A carbon nanotube (CNT)/polyaniline (PANI)@silver nanoparticle (AgNP) nanocomposite was synthesized using a scalable spray-coating technique and evaluated for its electrochemical performance. Electrochemical impedance spectroscopy analysis revealed an ultra-low charge transfer resistance (Rct = 1.2 Ω), significantly reducing interfacial losses and...

Metal oxide-based composites have garnered significant attention as advanced functional materials for addressing pressing environmental and public health challenges, particularly in the degradation and adsorption of pollutants , and antibacterial applications. These composites synergistically combine the intrinsic properties of metal oxides, such a...

Escalating global energy demands and environmental pollution necessitate innovative solutions for sustainable development. Conventional methods often prove inadequate, driving research towards advanced materials and technologies. This review critically analyzes existing industrial wastewater treatment approaches, highlighting their merits and limit...

In this study, the experimental adsorption isotherms of 2,4-dichlorophenoxyacetic acid (2,4-DA) on peanut skin treated with sulfuric acid were analyzed under different temperatures and characterized by Fourier transform infrared spectroscopy. The adsorption mechanism was interpreted based on statistical physics theory using the homogeneous double-l...

Fluorescence‐based biosensors have become highly effective analytical instruments, revolutionizing the landscape of biological and chemical detection across diverse fields. These devices harness the unique properties of fluorescence to detect and quantify a wide array of analytes with remarkable sensitivity and specificity. By integrating biologica...

Mn/Co/SnSe nanoparticles were synthesized using the co-precipitation method with the ratios MnxCoySn(1−x)(1–y)Se (where x = 0.1–0.5 and y = 0.1–0.5) coded MCSS-1, MCSS-2, MCSS-3, MCSS-4 and MCSS-5 nanoparticles. MnxCoySn(1−x)(1−y)Se nanoparticles were characterized with X-ray diffraction (XRD), UV-absorbance spectroscopy, and scanning electron micr...

This study examines the effects of incorporating varying ratios of chitosan (CS) through an ultrasound method on the adsorption properties of SnS2-g-C3N4 nanocomposite (GSn10). The optical and structural characteristics of the synthesized composite (CS30GSn10) were evaluated using various advanced techniques, including HRTEM, XRD, XPS, PL, EIS, DRS...

A novel composite material composed of polyvinyl alcohol and L-2-Amino-3-mercaptopropionic Acid has been developed to efficiently remove heavy metals namely; mercury, chromium, lead and cadmium from industrial wastewater. The composite structure was confirmed via a variety of analytical techniques, ensuring its structural, chemical, and physical st...

Halide-based double-perovskites have shown significant promise as compounds that can contribute to producing renewable energy. Their unique properties and characteristics allow them to address the issues of energy shortages. This study examined the physical properties of A2AuSbZ6 (A = Na, K, and Z = F, Cl) double perovskite halides, using first-pri...

MXenes are 2D-layered transition metal carbides, carbonitrides and nitrides that have received considerable attention as promising materials for water purification systems. MXenes' unique layered structure allows for boosted performance, e. g., huge surface area and porosity, enhanced light harvesting, improved charge separation , tunable band gap...

This paper presented the preparation, characterization, and adsorption properties of Brazil nut shell activated carbon for catechol removal from aqueous solutions. The equilibrium adsorption of catechol molecules on this activated was experimentally quantified at pH 6 and temperatures ranging from 25 to 55 °C, and at 25 °C and pH ranging from 6 to...

This present research employs a comprehensive study of the structural, optical, and electrical properties of Se85−xTe15Sbx glassy alloys, where x = 2.5,5,7.5,10, and 15 at.%. The synthesis of the glassy materials of Se85−xTe15Sbx is made through the conventional melt quenching method. Se85−xTe15Sbx thin films were then prepared on glass substrates,...

Nonplanar electron acoustic waves (NEAWs) having double spectral index distributed hot electrons are studied under two temperature electrons model in a collisionless unmagnetized plasma. Using this model, the Korteweg-de Vries (KdV) equation is derived in nonplanar geometry. On the basis of solutions of KdV equation, alteration of velocity, width a...

BACKGROUND A novel silver adsorbent, (2Z,2′ E)‐2,2′‐((1,10‐phenanthroline‐2,9‐diyl)bis(methaneylylidene))bis(N‐phenylhydrazine‐1‐carboxamide) (PHMC), was synthesized for efficient Ag⁺ adsorption. PHMC was prepared by refluxing 1,10‐phenanthroline‐2,9‐dicarboxaldehyde with N‐phenylhydrazinecarboxamide at 120 °C. The structural and morphological prop...

Correction for ‘Sustainable polymeric adsorbents for adsorption-based water remediation and pathogen deactivation: a review’ by Huda Alkhaldi et al., RSC Adv., 2024, 14, 33143–33190, https://doi.org/10.1039/D4RA05269B.

Water is a fundamental resource, yet various contaminants increasingly threaten its quality, necessitating effective remediation strategies. Sustainable polymeric adsorbents have emerged as promising materials in adsorption-based water remediation technologies, particularly for the removal of contaminants and deactivation of water-borne pathogens....

Rapidly developing two-dimensional (2D) materials, such as MoS2, graphene, and other transition metal dichalcogenides (TMDCs), have opened new possibilities for biosensing technologies. These materials exhibit unique electrical, mechanical, and optical properties, making them ideal candidates for highly sensitive and selective biosensors. This revi...

Antiperovskites have become the main focus of research and development in energy harvesting technologies. This research aims to evaluate the structural, electronic, optical, and thermoelectric characteristics of K3CuO and K3AgO using DFT-based calculations with the WIEN2K program. The cubic phase and thermal stability assessment has been ascertaine...

Gold nanoclusters (AuNCs), with sizes below 2 nm, have emerged as remarkable nanomaterials exhibiting unique optical, electronic, and chemical properties. Their ultra-small size imparts advantageous characteristics, including high surface area, tunable fluorescence, and excellent biocompatibility, making AuNCs highly promising for diverse applicati...

In this comparative study of the adsorption of l-phenylalanine (l-Phe) on two modified low-activated carbons (ACK and ACZ) at four temperatures (293–313 K), steric and energetic characteristics of adsorption were investigated. An advanced statistical physics multilayer model involving single-layer and double-layer adsorption scenarios was developed...

The Yttrium (Y)-rich sample was collected from the microgranite dikes in the Ras Abdah area, Northern Eastern Desert of Egypt. The mineralogical studies on the Y-rich microgranite dike (RMGD) revealed the presence of REEs-bearing minerals with 8480 mg/kg Y content. In this study, a novel method was used to selectively recover the Y(III) content (84...

Graphitic carbon nitride (g-C3N4)-based materials have emerged as promising photocatalysts due to their unique band structure, excellent stability, and environmental friendliness. This review provides a comprehensive and in-depth analysis of the current state of research on g-C3N4-based photocatalysts. The review summarizes several strategies to im...

Mercury, known for its severe health and environmental impacts even in trace amounts, necessitates effective removal from water systems. This research focuses on preparation of a novel adsorbent of 3,9−bis((4−amino−5−hydroxy−1 H−pyrazol−3−yl)amino)−2,4,8,10−tetraoxa−3,9−diphosphaspiro[5.5] undecane 3, 9−dioxide (PADP) for Hg(II) ions adsorption. To...

This work investigates the compositional dependence and thermal annealing of the morphological properties, electrical conductivity mechanisms and Mott's parameters of sprayed MoxW1-xO3 (x = 0, 0.05, 0.10 and 0,20) thin films. The prepared thin films were examined using field emission scanning electron microscopy (FE-SEM), energy dispersive X-ray an...

A facilely prepared composite based on Polyvinyl alcohol anchored‐ L‐cysteine (PVA‐L‐CYS) demonstrated efficient functionality in the elimination of heavy metals (Hg, Cr, Pb, and Cd) from working wastewater. The synthesis of the composite was validated through a comprehensive characterization utilizing various analytical techniques to ensure the co...

This study investigates the research capacity building (RCB) needs among faculty members at a university, focusing on the challenges and opportunities they encounter. It aims to develop strategies that are specifically tailored to the local context. An online survey revealed faculty members' neutral or positive views on various RCB aspects. A train...

Correction for ‘Highly selective optical sensor N/S-doped carbon quantum dots (CQDs) for the assessment of human chorionic gonadotropin β-hCG in the serum of breast and prostate cancer patients’ by Yasmeen M. AlZahrani et al., RSC Adv., 2023, 13, 21318–21326, https://doi.org/10.1039/D3RA01570J.

Correction for ‘Novel sensor for the determination of CA 15-3 in serum of breast cancer patients based on Fe–gallic acid complex doped in modified cellulose polymer thin films’ by Hind A. AlGhamdi et al., RSC Adv., 2023, 13, 21769–21780, https://doi.org/10.1039/D3RA02495D.

Fe-gallic acid MOF embedded in an epoxy methyl cellulose polymer (CMC) thin film was synthesized and characterized by different micro-analytical tools such as: FE-SEM/EDX, XPS analysis, XRD analysis, FT-IR, and fluorescence spectroscopy. Fe-gallic acid MOF doped in a stable CMC polymer thin film is used as a novel sensor to identify CA 15-3 in the...

A low-cost, accurate, and highly selective method was used for the assessment of the human chorionic gonadotropin β-hCG in the serum of breast and prostate cancer patients. This method is based on enhancing the intensity of luminescence displayed by the optical sensor N/S-doped carbon dots (CQDs) upon adding different concentrations of β-hCG. The l...

Zn1−xFexO films with x = 0, 5, 10, 15 and 20% at. were created using an electron beam gun and high vacuum. It has been considered how the concentration of Fe doping will affect the films' structural, magnetic and optical properties. All films' XRD signals at different Fe concentrations revealed wurtzite-type structures. The results demonstrate that...

An accurate, sensitive and selective RP-HPLC-UV method has been established for the estimation of Molnupiravir (MOL) in pure bulk powder and pharmaceutical formulation. Separation was achieved on an Inertsil C18 column (150.0 mm × 4.6 mm, 5.0 μm), using a mobile phase of 20 mM phosphate buffer pH 2.5 : acetonitrile (80 : 20, v/v%) in isocratic mode...

1,3,4-Thiadiazole molecules (1-4) were synthesized by the reaction of phenylthiosemicarbazide and methoxy cinnamic acid molecules in the presence of phosphorus oxychloride, and characterized with UV, FT-IR, 13C-NMR, and 1H-NMR methods. DFT calculations (b3lyp/6-311++G(d,p)) were performed to investigate the structures' geometry and physiochemical p...

Compositional dependence of microstructure and morphological properties of MoxW1-xO3 (0.2≥ x ≥ 0.0 at. %) thin films was studied. MoWO3 films were deposited by chemical spray pyrolysis technique on pre-heated glass substrates at 400oC and the sedimentation rate was kept constant at 70 ml/min with the deposition time fixed at 10 min to keep the film...

Europium doped titanium dioxide thin films were synthesized by sol–gel method to enhance the photocatalytic activity and achieve efficient treatment for industrial pharmaceutical effluent, under solar irradiation. Thin films were characterized by X-ray diffraction technique. X-ray diffraction pattern demonstrate that both pure and europium doped ti...

A simple, accurate and fast method was developed for the assessment of 3-nitrotyrosine as a biomarker for the early diagnosis of liver cirrhosis with minimal hepatic encephalopathy (MHE) using a (Eu(TTA)3Phen) photo probe. 3-Nitrotyrosine can remarkably quench the luminescence intensity of the (Eu(TTA)3Phen) complex in DMSO at pH = 9 and λem = 617...

An innovative, simple and cost effective Tb3+-atorvastatin photo probe was designed and used as a core for a spectrofluorometric approach to sensitively determine two vital biological compounds in serum samples. Tb3+-atorvastatin complex displays a characteristic electrical band with λ em at 545 nm with significant luminescence intensity, which is...

An innovative, simple and cost effective Tb3+-simvastatin photo probe was designed and used as a core for a spectrofluorometric approach to sensitively determine four vital biological compounds in different matrices. A Tb3+-simvastatin complex displays a characteristic electrical band with λ em at 545 nm with significant luminescence intensity, whi...

In this study, a cadmium telluride (CdTe) film with a thickness of 1 μm was evaporated onto the glass substrate (at a constant temperature of 150°C) using the evaporation technique. These films were immersed in a Cu(NO3)2 (1 g/1000 mL) solution for 30 minutes to infuse copper onto CdTe film. In addition, the treated film was annealed in vacuum at d...

Novel synthesis of 3-(2-oxo-2H-chromene-3-yl) quinoxaline-2(1H)-one nanostructured thin film [3OCQ]TF has been developed. Its compositional, structural flexibility, tunable bandgap, high quantum photoluminescence yields, optical and electronic properties have been explored. While the progress of these properties has been studied recently, the roots...

In the present study, thermal evaporation techniques were used to prepare Cadmium Telluride (CdTe) films with thickness 1 μm on a glass substrate (at constant temperature150 °C). By immersing these films in a solution Cu(NO3)2 (1g/1000ml) for 30 min, the prepared films were doped by ion exchange with Cu. Furthermore, the doped films were annealed i...

Poly(ortho-phenylenediamine) micro-rods (PoPD) are synthesized in the acidic medium at 25 °C by an oxidative polymerization method in the absence or the presence of a soft template including the following surfactants para toluene sulfonic acid (PoPD-PTS) and trisodium citrate (PoPD-TSC). Then, the thin films of poly(ortho-phenylenediamine) (PoPD)F,...

[(Z)-2-((1,3-bis(diphenyl phosphaneyl) propylidene) amino) acetic acid/Zirconium oxide nanoparticles] composites thin film [DPPP + Gly/ZrO2]C is synthesized by utilizing physical vapor deposition (PVD) with a speed rate of 2000 rpm/30 s. The optimization of the samples was performed using density functional theory (DFT) by DMol3 and Cambridge Seria...

. The influence of annealing temperature on the crystallization, morphological and optical properties of polycrystalline sprayed V 2 O 5 was studied. X-ray diffraction analysis (XRD) revealed that films deposited at substrate temperature of 350 • C were an orthorhombic structure. Moreover , the degree of crystallization is improved by thermal annea...

The authors reported the data found by FT-IR spectroscopy, ultrasonic velocities, DTA investigations of 5Al2O3 – 25Li2O – (70 − x) P2O5 – x TiO2, (0 ≤ x ≤ 25 mol%) of the prepared glass samples. From FT-IR spectroscopy has been indicated the titanate doped phosphate glasses increase the produce of non-bridging oxygens. By ultrasonic velocities has...

[Poly(o-phenylenediamine)+poly(p-toluidine)/Zirconium oxide nanoparticles] nanofiber composites thin film [PoDA + PpT/ZrO2]C is fabricated by using oxidative polymerization method at pH~0.65/anhydrous FeCl3. In PEG200 as a soft template, the copolymerization process is performed at 25 °C. The nanofiber composite [PoDA + PpT/ZrO2]C thin film is stud...

Glass samples with the compositions xFe 2 O 3-35SiO 2-35B 2 O 3-10Al 2 O 3-(20 2 x) Na 2 O (0 £ x £ 1 mol.%) were designed and assembled by melting quenching technique. These samples were investigated by XRD, optical, mechanical, thermal, and FT-IR spectroscopy studies. FT-IR spectra reveal that these glasses are built up of BO 3 , BO 4 , and octah...

A copolymer of hydrochloric acid doped o-anthranilic acid with o-aminophenol (PAAOAP) was prepared in a highly acidic medium based on the oxidative polymerization in the presence of polyethylene glycol (PEG 200) as a soft template by ferric chloride initiator. The resulting doped hydrochloric acid copolymer (PAAOAP) was characterized by several tec...

Amorphous semiconducting thin films of Se 90-x Zn 5 Te 5 In x (x=0, 2, 4, 6, 8 and 10 at. %) are deposited on glass substrates by thermal evaporating technique with thickness about of 1000 nm. The transmittance spectra are investigated by Swanepoel method to compute the optical coefficients and parameters in the spectral region of (400-2500) nm, su...

Amorphous semiconducting thin films of Se 90-x Zn 5 Te 5 In x (x=0, 2, 4, 6, 8 and 10 at. %) are deposited on glass substrates by thermal evaporating technique with thickness about of 1000 nm. The transmittance spectra are investigated by Swanepoel method to compute the optical coefficients and parameters in the spectral region of (400-2500) nm, su...

Titanium-doped and titanium-free lithium borate glasses were prepared using a quenching method and high-purity-grade chemical substances. Structural analysis was carried out by Fourier transform infrared (FT-IR) spectroscopy and mechanical measurement. The states of the produced glasses were examined by x-ray diffraction, and the density (ρ) and mo...

A series of aluminum, lead phosphate glasses with chemical composition 70P2O5–5Al2O3–(25-x) Na2O-x PbO, where x = (0, 5, 10, 15, 20 and 25 mol%) have been prepared and synthesized using a conventional melting method. The structural analysis has been performed using FTIR techniques. FT-IR confirmed that PbO4, and AlO4 are structural units. The optic...

Different compositions of the bulk sample of Zn1-xGdxO (x = 0, 0.02, 0.04, 0.06, 0.08 and 0.1) are fabricated using co-precipitation technique. The current study investigates the structural, optical and magnetic properties of ZnO thin films doped by Gd. The desired films were deposited onto highly-clean glass substrates by electron beam technique....

A simple, precise and sensitive method in which, Tb-acetyl acetone (Tb-ACAC) complex embedded in polymethylmethacrylate (PMMA) is used for the early diagnosis of liver cancer. The diagnosis process depends on the assessment of the concentration of alpha fetoprotein (AFP) in the serum samples of different liver patients. The Tb-acetyl acetone (Tb-ACA...

The impact of film thickness on both optical and electrical parameters of amorphous As47.5Se47.5Ag5 thin films at different thickness (174–1383 nm) was studied. In this study the envelope method was employed to determine the optical parameters of the studied films using the experimentally measured data of the optical transmittance Tλ. The optical a...

A series of Zn1−xCoxSe (x = 0, 0.025, 0.050, 0.075, and 0.100) films using were evaporated (thickness of 1 μm) using electron beam gun. The effect of Co doping on the structural, optical, and magnetic properties has been investigated. X‐ray diffraction studies confirm formation of zinc blend structure for all Zn1−xCoxSe films. The crystallite size...

Thin films of nickel oxide (NiO) were deposited on glass substrates at a different temperature of growth using a spray pyrolysis technique. X-ray diffraction (XRD) and optical properties have been studied for the properties of the samples obtained. Analysis of XRD data show that at a low growth temperature, an amorphous form has been obtained, whil...

In the current work, Cu2-xSxO(x = 0.05, 0.1 and 0.2) and Cu2-yCryO (y = 0.03 and 0.06) composite thin films were deposited on a heated glass substrate using spray pyrolysis technique. The effect of S and Cr doping on microstructure, crystal defects and mechanical properties of Cu2O nanoparticles was studied. X-ray diffraction results reveal that th...

Thin films of nickel oxide (NiO) were deposited on glass substrates at a different temperature of growth using spray pyrolysis. Optical properties were examined using spectral measurement at a wavelength range of 300–2500 nm. Optical constants (n and k) were calculated from corrected transmittance and correct reflection. The data obtained show that...

Thin films of nickel oxide (NiO) were deposited on glass substrates at a different temperature of growth using a spray pyrolysis technique. X-ray diffraction (XRD) and optical properties have been studied for the properties of the samples obtained. Analysis of XRD data show that at a low growth temperature, an amorphous form has been obtained, whil...

This article was devoted to synthesis nanocrystalline Cu2O thin films using the spray pyrolysis technique, besides to study the influence of their solution molarity on crystallography, microstructure and crystal defects. X-ray diffraction analysis revealed that as-deposited Cu2O films have the amorphous nature but after their annealing at 550 K for...

In this paper, Nano-Plasmonic Optical Resonator design of Fabry–Pérot type is proposed. It is an array of metal nanorods separated from a metal film by a dielectric layer. Some plasmonic optical resonators are briefly reviewed. Modeling and simulation of the spectral properties of the electric field in the resonator are presented. Tuning the resona...

Normal ultrasonic transducers of 0.5, 1, and 2 MHz are modified using delay lines which are made of Quartz. Such modification is to ameliorate the capability of the transducer to investigate Gd-doped ZnO thin films whose thickness is too thin. The normal transducers cannot test materials that have too thin thickness due to the near fields of these...

The dynamics and noise of semiconductor lasers under optical feedback (OFB) have been simulated. The study is performed as applied to an optic-disc system in which laser radiation is reflected by the disc surface and re-injected into the laser cavity. We examine the possibility of suppressing OFB induced noise in the optic-disc system by the techni...

Electrochromic iridium oxide thin films were deposited by spray pyrolysis technique onto indium-doped tin oxide (ITO) coated glass substrates using iridium chloride as an aqueous solution. The influence of the substrate temperature, the deposition period of time and the solution molarity have been investigated as related to the film's electrochromi...

Electrochromic iridium oxide thin films were deposited by spray pyrolysis technique onto indium-doped tin oxide (ITO) coated glass substrates using iridium chloride as an aqueous solution. The influence of the substrate temperature, the deposition period of time and the solution molarity have been investigated as related to the film's electrochromi...

The various Crystalline and non-crystalline nickel oxide (NiO) thin films were obtained by spray pyrolysis technique (SPT) using nickel acetate tetrahydrate solutions onto glass substrates at different temperatures from 225 to 350 °C. Structure of the as-deposited NiO thin films have been examined by X-ray diffraction (XRD) and atomic force microsc...

Crystalline and non-crystalline nickel oxide (NiO) thin films were obtained by spray pyrolysis technique (SPT) using nickel acetate tetrahydrate solutions onto glass substrates at different temperatures from 225 to 350˚C. Structure of the as-deposited NiO thin films have been examined by X-ray diffraction (XRD) and atomic force microscope (AFM). Th...

Nanostructure and electrical properties of iridium oxide (IrO2) thin films prepared by spray pyrolysis technique (SPT) have been experimentally characterized. The effect of solution molarity (SM) and substrate temperature (Tsub) on the nanostructure features and electrical conductivity of these films has been investigated. The results of X-ray diff...

Optical properties of iridium oxide films fabricated by the spray pyrolysis technique (SPT) have been investigated. The transmission and reflection spectra of the sprayed films were measured by using a double-beam spectrophotometer in the wavelength range from 200 to 2500 nm. Influences of the preparative parameters; namely, substrate temperature (...

Semiconducting thin films of cadmium selenide have been grown by conventional thermal evaporation technique on glass substrate. Films evaporated at substrate temperature equal 523 K are stoichiometric and homogeneous. Effect of various growth parameters like rate of deposition and substrate temperature on the electrical properties has been studied...

Biofilms are grown on different polymer materials and are investigated by light and scanning force microscopy. Here, we present investigations of Escherichia coli bacterial biofilms grown on the polymer material polyetheretherketone (PEEK). A pulsed nitrogen laser has been applied to the samples and the interaction of the laser beam with the biofil...

Thorium dioxide (ThO2) thin films were deposited by the spray pyrolysis technique onto a glass substrate maintained in the temperature range 100-350 degreesC by using thorium nitrate as a starting solution. Structural, morphological, optical and electrical properties have been investigated. The results of FTIR showed that thorium nitrate is complet...

Polycrystalline nickel oxide films with preferential growth along (111) plane were deposited onto glass substrates, maintained at 350°C, by the spray pyrolysis technique using nickel chloride as starting solution. The effect of solution concentration on their structural, electrical, and optical properties was studied. Using X-ray diffraction, the s...

Polycrystalline Bi2S3 thin films of orthorhombic phase were prepared by a spray pyrolysis technique on an amorphous substrate. The influence of substrate temperature, Ts, in the range of 180–500°C and solution molarity (0.05–0.4mol) on the structural, electrical and optical properties were studied in detail. The crystal structure and orientation of...

Positron behaviour at grain boundaries is characterized by their bulk diffusibility D, their bulk free lifetime tf and their trapped lifetime tt (tt > tf). Al-Mgx samples (x = 0-1.4 at %) have been homogenized at 573 K for 12 hours. The mean lifetime, as (indirectly) measured at various concentrations, show a good fitting with Sigmodel giving tt =...