Article
Chemistry, Physical
R. Kabilan, M. Ashokkumar
Summary: Cu and Cr co-doped ZnO nanopowder was synthesized and annealed at different temperatures. Sample S2 exhibited the best crystallization with the least defects, while samples S1 and S3 showed impurities and lattice distortion. The nanopowders displayed wide absorption and emission bands in UV/violet, blue, and green regions, with room-temperature ferromagnetism observed in all samples.
JOURNAL OF MOLECULAR STRUCTURE
(2022)
Article
Materials Science, Multidisciplinary
S. M. Devasena, G. Murali, D. Amaranatha Reddy, Y. C. Ratnakaram, A. Sharon Smiley, K. Sunil Kumar, R. P. Vijayalakshmi
Summary: In this study, the structural, optical, photoluminescence, and magnetic characteristics of pristine and Cr/Mn-doped ZnO nanoparticles were investigated. The results showed that the prepared nanoparticles had a monophasic hexagonal structure. The successful incorporation of Cr/Mn elements into the ZnO lattice was confirmed by various spectroscopy measurements. Additionally, both the photoluminescence intensity and ferromagnetic behavior of ZnO nanoparticles were enhanced by Cr/Mn doping.
MATERIALS SCIENCE AND TECHNOLOGY
(2023)
Article
Materials Science, Multidisciplinary
A. Tursucu, S. Aydogan, A. Kocyigit, A. Ozmen, M. Yilmaz
Summary: Undoped and Cr-doped ZnO thin films were deposited on glass and p-Si substrates using the chemical spray pyrolysis technique. The films were characterized and their electrical properties were studied. The results showed that the Au/ZnO:Cr/p-Si device exhibited good optoelectronic characteristics, making it suitable for optoelectronic applications.
Article
Engineering, Electrical & Electronic
S. Vinoth, A. M. S. Arulanantham, S. Saravanakumar, R. S. Rimal Isaac, N. Soundaram, N. Chidhambaram, Devarajan Alagarasan, S. Varadharajaperumal, Mohd. Shkir, S. AlFaify
Summary: Cobalt-doped ZnO thin films synthesized using chemical bath deposition show excellent UV photosensing properties, with nanowire morphology and hexagonal wurtzite crystal structure. Due to the replacement of Co2+ ions, an increase in crystallite size and decrease in bandgap was observed, leading to high photoabsorption capability, with the highest responsivity reaching 0.918 AW(-1).
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2021)
Article
Chemistry, Inorganic & Nuclear
Usman Khan, Adeela Nairan, Karim Khan, Ayesha Khan Tareen, Dang Wu, Junkuo Gao
Summary: In this study, the magnetic properties of Co ferrite were significantly improved by Cr substitution. The results showed that Cr substitution had a significant impact on the lattice contraction and magnetic properties of Co ferrite. In addition, the study of low-temperature magnetic properties provided insights into the temperature-dependent behavior of the magnetic properties.
SOLID STATE SCIENCES
(2022)
Article
Engineering, Environmental
SP. Keerthana, R. Yuvakkumar, G. Ravi, Abdullah G. Al-Sehemi, Dhayalan Velauthapillai
Summary: In this study, pure and La-doped barium ferrite samples were synthesized and characterized for their crystal structure, properties, and morphology. The La-doped sample showed higher efficiency in photocatalytic degradation of methylene blue and can be easily separated by magnetic methods for water reuse in wastewater treatment.
JOURNAL OF HAZARDOUS MATERIALS
(2022)
Article
Optics
R. B. Adamov, G. A. Melentev, I. V. Sedova, S. V. Sorokin, G. V. Klimko, I. S. Makhov, D. A. Firsov, V. A. Shalygin
Summary: This study investigates the THz luminescence in doped nanostructures with GaAs/AlGaAs quantum wells under interband optical pumping. The results show that the spatial separation of donors and acceptors can greatly enhance the integrated intensity of THz emission.
JOURNAL OF LUMINESCENCE
(2024)
Article
Chemistry, Physical
Anusree Das, Nilesh Khamaru, Sudipta Bandyopadhyay, Souvik Chatterjee, Dipankar Das
Summary: This study synthesized nanocomposites (NCs) containing SrFe12O19 and Bi0.9Dy0.1FeO3, where Dy-substitution increased the magnetization and dielectric constant of BiFeO3 (BFO), while increasing SFO content in the NCs led to higher magnetization but lower dielectric constant. The changes in capacitance of the NC samples in the presence of a magnetic field up to 150 kOe indicated a substantial enhancement of the magnetoelectric (ME) coupling coefficient of BFO in the nanocomposites, which tended to improve with higher SFO content in the NCs.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Materials Science, Ceramics
P. Ning, C. C. Liu, X. Ma, G. W. Mao, D. F. Luo, Y. J. Wang, Y. F. Hou, T. Fu
Summary: Calcium doped magnetite nanoparticles were synthesized for biomedical applications. The presence of high calcium content affected the morphology, magnetic properties, antibacterial activity, and osteogenetic properties of the nanoparticles.
CERAMICS INTERNATIONAL
(2022)
Article
Materials Science, Multidisciplinary
G. Sridhar, Deepak N. Hebbar, Samvit G. Menon, Prinston Melroy Lewis, K. S. Choudhari, Robin E. Kroon, Hendrik C. Swart, Suresh D. Kulkarni
Summary: In this study, Red-NIR emitting ZnGa2-xCrxO4 nanoparticles were synthesized and the effect of annealing on their properties was investigated. The annealing process resulted in an increase in crystallite size and a change in color tone, indicating dopant diffusion. Spectral analysis revealed the presence of Cr3+ and its structural characteristics in the crystal field.
Article
Engineering, Electrical & Electronic
D. Berman-Mendoza, O. Diaz-Grijalva, R. Lopez-Delgado, A. Ramos-Carrazco, M. E. Alvarez-Ramos, F. Romo-Garcia, H. J. Higuera-Valenzuela, R. Rangel
Summary: The growth of CdS thin films by chemical bath deposition and doping with copper ions was reported to produce pseudo-MOSFETs with adjustable channel currents. Cu-doping was found to improve the electrical behavior of the thin film transistors, leading to changes from n-type to p-type channels with different mobilities. This study contributes to the development of thin film transistors by introducing Cu ions to modify their electrical properties.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2021)
Article
Engineering, Electrical & Electronic
Pramod Mandal, Udai P. Singh, Sudesna Roy
Summary: This study aims to dope beta gallium oxide with different concentrations of europium, revealing that the optimal dopant concentration in beta gallium oxide is around 10% Eu. The optical bandgap of beta gallium oxide was found to decrease due to doping with europium, with transmittance increasing drastically but the bandgap remaining independent of the dopant concentration.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2021)
Article
Engineering, Electrical & Electronic
Harpreet Kaur, Anand Kumar Tyagi, Amrik Singh, Dharamvir Singh Ahlawat
Summary: Ferrite samples with improved magnetic and dielectric properties were prepared by sol-gel process. Structural and morphological analysis showed a decrease in lattice parameter and the formation of aggregated structures. Magnetic characterization revealed a transition from hard magnetic to soft magnetic materials, with narrower hysteresis loops. Dielectric measurements demonstrated a decrease in dielectric constant and loss at low frequencies.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2023)
Article
Biotechnology & Applied Microbiology
Astita Dubey, Soma Salamon, Supun B. Attanayake, Syaidah Ibrahim, Joachim Landers, Marianela Escobar Castillo, Heiko Wende, Hari Srikanth, Vladimir V. Shvartsman, Doru C. Lupascu
Summary: Ionic engineering is used to substitute rare-earth elements in BiFe0.95Mn0.05O3 NPs, resulting in morphological changes and improved piezoresponse and magnetic hyperthermia potential. The increment in magnetization has an impact on the hyperthermia results.
FRONTIERS IN BIOENGINEERING AND BIOTECHNOLOGY
(2022)
Article
Materials Science, Ceramics
Pinki Punia, R. K. Aggarwal, Rakesh Kumar, Rakesh Dhar, Preeti Thakur, Atul Thakur
Summary: This study investigated the adsorption of heavy metals (Cd and Cr) from industrial wastewater using a series of Ca-substituted nickel zinc nanoferrites (CaxNi0.4Zn0.6-xFe2O4 (x = 0.1, 0.2, 0.3, 0.4, 0.5 and 0.6)) (CNZNFs). The effect of calcium doping and contact time on the adsorption of cadmium and chromium ions was examined, and the prepared nanoadsorbents showed high removal efficiencies for both Cd (98.25%) and Cr (51%) ions. Structural analysis confirmed the formation of spinel structured nanoparticles with varying crystallite size and porosity depending on the calcium concentration. The adsorption data was well fitted by the pseudo second order kinetic model and Langmuir isotherm model, with high adsorption efficiencies of Cd (128.20 mg/g) and Cr (23.54 mg/g) observed. The Langmuir isotherm model showed better fitting than the Freundlich isotherm model due to higher correlation coefficients for both heavy metals.
CERAMICS INTERNATIONAL
(2022)
Article
Materials Science, Multidisciplinary
A. M. El-naggar, Zein K. Heiba, Mohamed Bakr Mohamed, A. M. Kamal, G. Lakshminarayana
Summary: A Poly(vinyl alcohol)/poly(ethylene glycol)/polyvinyl pyrrolidone blend loaded with nano-(Zn0.75-xFexCd0.25S) was prepared using thermolysis and casting procedures. The addition of Fe ions resulted in a slight increase in cell parameter and a decrease in crystallite size. X-ray diffraction analysis indicated possible cross-linking between different polymers in the blend. UV-Vis spectra analysis showed that the nanofiller-loaded blend had the highest values for absorbance, extinction coefficient, refractive index, dielectric constant, optical conductivity and nonlinear optical parameters when Fe content was 10%. The fluorescence intensity and colors emitted were dependent on the amount of Fe in the nanofiller, with the blend containing 15% Fe exhibiting the highest fluorescence intensity.
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
(2022)
Article
Materials Science, Multidisciplinary
Zein K. Heiba, Mohamed Bakr Mohamed, Ali Badawi
Summary: In this study, (1-x) ZnMn2O4/xMnS nanosamples were synthesized using co-precipitation and molten solid-state methods. The influence of Mn and S ion insertion in the ZMO lattice on various properties such as lattice parameters, absorption, and electrical behavior was investigated using different techniques.
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
(2022)
Article
Physics, Multidisciplinary
Zein K. Heiba, Mohamed Bakr Mohamed, Noura M. Farag, Ali Badawi
Summary: The (1 - x)NiCo2O4/xPbS (0 <= x <= 0.2) nanocomposite samples were synthesized using hydrothermal and thermolysis procedures. The different phases, structural and microstructure parameters were determined using x-ray diffraction and Rietveld quantitative phase analysis. The results showed that the nanocomposite samples had narrow size distribution, modified absorption spectra, increased optical band gaps and improved nonlinear optical properties.
Article
Chemistry, Physical
Zein K. Heiba, Mohamed Bakr Mohamed, Noura M. Farag, Ali Badawi
Summary: (1-x)CuCo2O4/xMnS (x = 0, 0.25, 0.5) nanocomposite samples were prepared using hydrothermal and thermolysis procedures, and the effect of inserting Mn and S ions into CuCo2O4 was investigated.
ZEITSCHRIFT FUR NATURFORSCHUNG SECTION A-A JOURNAL OF PHYSICAL SCIENCES
(2022)
Article
Multidisciplinary Sciences
A. M. El-Naggar, Zein K. Heiba, Mohamed Bakr Mohamed, A. M. Kamal, G. Lakshminarayana
Summary: This study investigates the effect of doping nano Zn0.75-x Mn (x) Cd0.25S on the optical properties of PVA/PEG (7:3) polymer blend. The optical bandgap of the blend decreases upon doping with Zn0.75Cd0.25S, but increases with increasing Mn content. The doped blend shows enhanced nonlinear parameters, making it suitable for applications in nonlinear optics and photonics.
JOURNAL OF TAIBAH UNIVERSITY FOR SCIENCE
(2022)
Article
Engineering, Electrical & Electronic
Zein K. Heiba, Mohamed Bakr Mohamed, Noura M. Farag, Ali Badawi
Summary: In this study, Nano Mn0.95M0.05S (M equivalent to Cu, Mg) samples were prepared using the molten salt solid state reaction method. The X-ray diffraction and Fourier transform infrared techniques were applied to analyze the phase structure and characteristic vibrations of the samples. The results showed that Cu and Mg were successfully incorporated into the MnS lattice, and the doped nano MnS samples exhibited suitable colors for LED applications.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2022)
Article
Engineering, Electrical & Electronic
A. M. El-naggar, Zein K. Heiba, Mohamed Bakr Mohamed, A. M. Kamal, A. M. Aldhafiri, G. Lakshminarayana
Summary: Blended polymers with 70% PVA, 20% PVP, 10% PEG, and different weight percentages of SnS2/Y nanofiller were produced. The structural and microstructural parameters of the nanofiller were analyzed, and its distribution in the blended polymers matrix was examined. The optical and thermal properties of the blends were investigated, and the effect of SnS2/Y loading on these properties was discussed. The study found that the addition of SnS2/Y reduced the optical band gaps and altered the refractive index, making the loaded blends suitable for nonlinear optical and photonic applications.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2022)
Article
Engineering, Electrical & Electronic
Zein K. Heiba, Mohamed Bakr Mohamed, Ali Badawi, M. Abdellatief
Summary: Nanoparticles of TiO2 and Ti0.97M0.03O2 (M equivalent to V, W) doped with V and W ions were synthesized using the sol-gel method. The effects of doping on the crystal structure, cell parameters, and optical properties of TiO2 were investigated using synchrotron x-ray diffraction and density functional theory calculations, revealing significant changes in the lattice and electronic structure.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2022)
Article
Engineering, Electrical & Electronic
Zein K. Heiba, A. M. El-naggar, Mohamed Bakr Mohamed, A. M. Kamal, M. M. Osman, A. A. Albassam, G. Lakshminarayana
Summary: PVA/PVP blended polymers loaded with nano Zn0.75-xCd0.25VxS (x = 0, 0.05. 0.1, 0.15) were synthesized and found to have a homogeneous distribution of the embedded nano-powder throughout the matrix. The optical bandgaps of all loaded blends with the nano materials were decreased.
OPTICAL AND QUANTUM ELECTRONICS
(2022)
Article
Materials Science, Multidisciplinary
A. M. El-naggar, M. M. Osman, Zein K. Heiba, Mohamed Bakr Mohamed, A. M. Aldhafiri
Summary: This study investigated the effects of CsI doping on the optical properties of perovskite films, revealing changes in bandgap, absorption coefficient, and refractive index.
Article
Materials Science, Multidisciplinary
Zein K. Heiba, Mohamed Bakr Mohamed, Ah. Abd Ellatief, A. El-Denglawey, Ali Badawi
Summary: MgFe2O4 and MgFe2O4/(1-x)MnO-xCdO samples were synthesized and their structural and optical properties were investigated. The incorporation of Mn and Cd ions led to changes in lattice parameters and particle size, as well as variations in the optical band gaps. The samples showed weak ferrimagnetic behavior with an increase in saturation magnetization and a decrease in coercivity.
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
(2022)
Correction
Optics
A. M. El-naggar, Zein K. Heiba, Mohamed Bakr Mohamed, A. M. Kamal, G. Lakshminarayana, Muhammad Ali Shar
Article
Polymer Science
A. M. El-Naggar, Shadia Z. Brnawi, A. M. Kamal, A. A. Albassam, Zein K. Heiba, Mohamed Bakr Mohamed
Article
Materials Science, Multidisciplinary
Zein K. Heiba, M. A. Ahmed, M. Hassan, Ali Badawi, A. M. El-naggar, Mohamed Bakr Mohamed
Summary: In this study, an effective Ag2CO3/CeO2 p-n junction was developed for the photocatalytic reduction of a model cationic pollutant, rhodamine B dye. The Ag2CO3/CeO2 heterojunction was formed through sol-gel and sonochemical routes, with silver carbonate successfully distributed on localized active sites. The physicochemical features of the solid specimen were analyzed through various experimental methods. The results showed that the p-n junction exhibited enhanced photocatalytic activity for the decomposition of the dye compared to pristine CeO2 nanoparticles.
Article
Polymer Science
A. M. El-Naggar, Zein K. Heiba, A. M. Kamal, Omar H. Abd-Elkader, Mohamed Bakr Mohamed
Summary: Doping mixed polymers with appropriate fillers is believed to be the most efficient method to create novel materials for optoelectronic applications. Undoped and doped PVC polymers with ZnS/Mn were fabricated at different temperatures, and their structure and microstructure were analyzed. The distribution of the nanofiller in the PVC matrix was determined using various techniques, and the effect of preparation temperatures on the optical properties of the PVC polymer was studied. Doping with ZnS/Mn decreased the optical band gaps and enhanced fluorescence intensity in the PVC.
