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Öğe Comparison between NiO and MnO2 nanoparticles deposited on graphene-coated nickel foam for water purification applications(Elsevier, 2023) AlAnazi, Maha; Ghrib, Taher; Ercan, Filiz; Kotb, Essam; Bubshait, Ruqaiyah; Almilad, Fatimah; Elibol, ErdemNanoparticles of NiO, and MnO2 nanoparticles were successfully synthesized on graphene-coated Nickel foam (NFG) substrates for the synthesis of dual-functional specimens for antibacterial and photocatalytic applications. The morphological, structural, and optical properties were investigated thanks to the techniques of scanning electron microscopy (SEM), Fourier-transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), UV-Vis, and photoluminescence spectroscopy. It was observed from XRD analysis that alpha-MnO2 and NiO nanoparticles were deposited with high purity as a thin film on NFG substrates. The photocatalytic efficiency of the synthesized materials was tested on a Methylene blue (MB) solution as a target dye pollutant and the obtained results indicate a good degradation rate under visible light irradiation. Antibacterial activity was tested on Staph aureus, Pseudomonas aeruginosa, and the yeast Candida albicans. The obtained results show that MnO2/NFG and NiO/NFG specimens constitute good candidates for the treatment of wastewater.Öğe Crystallinity Improvement of Co3O4 by Adding Thiourea(2020) Ercan, Filiz; Mahmood, Bahroz Kareem; Agıd, Riyadh Saeed; Bulut, Niyazi; Ercan, Ismail; Yahıa, I.S.; Ateş, TankutTricobalt tetraoxide (Co3O4) samples having different thiourea/Co molar ratio of 0, 5 and 10 were prepared by wetchemical synthesis. The effects of thiourea content on the crystal structure-related parameters of Co3O4 weredetermined. The increase in the amount of thiourea caused a gradual decrease in the lattice parameters and specificsurface area and an increase in the crystallinity and crystallite size. The experimental analysis results showed thatthiourea content can be used to control the crystal structure-related parameters of Co3O4.Öğe The effects of Zn/Fe co-dopants on the structural, thermal, magnetic, and in vitro biocompatibility properties of calcium pyrophosphate ceramics(Elsevier, 2022) Kebiroğlu, Hanifi; Ateş, Tankut; Bulut, Niyazi; Ercan, İsmail; Ercan, Filiz; Açarı, İdil Karaca; Köytepe, SüleymanIn the present work, calcium pyrophosphate (CPP) samples co-doped with Zn and Fe were prepared by using a wet chemical method, and their thermal, magnetic, structural, morphologic, and in vitro biocompatibility properties were investigated for the first time. X-ray diffraction (XRD) results showed that a continuous decreasing trend in two lattice parameters, unit cell volume, and average crystallite size was observed with the increasing Zn content. Zn content affected the magnetic and thermal behaviors, cell viability property of the CPP, as well as morphology. The sample containing 0.22 at.% Zn and 0.22 at.% Fe showed the best biocompatibility among all the samples, and the higher amount of Zn caused the lower cell viability. The bandgap of the CPP decreased with adding of Zn, while the linear absorption coefficient value increased.Öğe Enhanced photocatalytic degradation of methylene blue by nanocomposites prepared by laser ablation of Bi on CNT-a-Fe2O3 nanoparticles(Elsevier Sci Ltd, 2022) Manda, Abdullah A.; Elsayed, Khaled; Gaya, Umar İbrahim; Haladu, Shamsuddeen A.; Ercan, İsmail; Ercan, Filiz; Alheshibri, MuidhThe low conductivity and high combination rate of photogenerated electrons (e-) and photogenerated holes (h+) are the real challenges of photocatalysis. These problems could be mitigated by the synthesis of heterostructured nanocomposites (NCs). In this study, Bi@CNT-Fe2O3 nanocomposite was fabricated via pulsed laser ablation in liquid and characterized by UV-Vis spectroscopy, photoluminescence (PL), X-ray diffraction (PXRD) and field scanning electron microscopy (FESEM). These techniques revealed successfully the formation of CNT-alpha-Fe2O3 and Bi@CNT-alpha-Fe2O3 nanocomposites. The photocatalytic activities of the Fe2O3, CNT-alpha-Fe2O3, and Bi@CNT-Fe2O3 photocatalysts were evaluated by the degradation of methylene blue (MB) dye under ultraviolet (UV) light irradiation in the presence of a very low concentration of hydrogen peroxide (H2O2) as an oxidizing agent. The results show that the Bi@CNT-alpha-Fe2O3 NC has the highest photocatalytic degradation efficiency of MB which completes in 20 min of UV light irradiation. In addition, the obtained rate constants (min-1) of Bi@CNT-alpha-Fe2O3 NC were 1.3 and 3.4 times higher than those of CNT-alpha-Fe(2)O(3 )and alpha-Fe2O3. nanocatalysts, respectively.Öğe Exploring the Influence of Various Solvents on the Structural, Optical, and Spectroscopic Properties of MgO(Tayfun UYGUNOĞLU, 2024) Kareem, Rebaz Obaıd; Ahmad, Bast; Bulut, Niyazi; Demirci, Tuna; Ercan, Ismail; Ercan, Filiz; Ateş, TankutMagnesium oxide (MgO) samples were manufactured at different temperatures using various solvents of water and ethanol. MgO structure was also modeled and its vibration modes were calculated. The kind of solvent as-used in the synthesis and calcination temperature caused changes in the lattice parameter, crystallinity, and crystallite size. The crystallite size increased with increasing production temperature for both series of the MgO. The morphology and bandgap energy were also affected significantly by the solvent and calcination temperature.Öğe Investigation of structural, spectroscopic, dielectric, magnetic, and in vitro biocompatibility properties of Sr/Ni co-doped hydroxyapatites(Elsevier Sci Ltd, 2022) Ercan, Filiz; Kayed, Tarek S.; Kaygılı, Ömer; Bulut, Niyazi; Almohazey, Dana; Ateş, Tankut; Al-Ahmari, Fatimah SaadIn this study, the changes caused by Ni and Sr additives on the structural, thermal, dielectric, and magnetic properties of hydroxyapatite (HAp) samples were examined and reported for the first time in detail. Some effects of the Sr/Ni site disorder on the crystallographic, dielectric, and magnetic properties in Sr/Ni-HAp have been examined, as well as their cytotoxicity effects. The addition of Ni affected the morphology of nanoparticles with a low agglomeration increase. Our results showed that the dielectric constant (epsilon') and dielectric loss (epsilon '') have greater values at low frequencies than at higher frequencies for all the samples. It can be concluded that Ni and Sr additions to the HAp structure contribute to the development of thermal, magnetic, and dielectric properties required to mimic natural HAp in the study conducted with the idea of creating a medical application area for bone healing and regeneration. The cytotoxicity test of the produced nanoparticles and the evaluation of the results were also performed using human foreskin fibroblasts (HFF). The viability of cells after treatment for 48 h ranged between 50 and 75%. While 0.37Ni-0.37Sr-HAp and 1.11Ni-0.37Sr-HAp were similar to 0.37Sr-HAp, 0.74Ni-0.37Sr-HAp had the highest cellular viability. At 0.1 mg/mL, 0.74Ni-0.37Sr-HAp had a viability of 79.97% compared to the untreated control cells. Our Sr/Ni-HAp nanoparticles have promising medical applications in bone healing and regeneration.Öğe Investigation on structural, optical, thermal, and dielectric properties of cellulose propionate/styrene-maleic anhydride copolymer/molybdenum nanocomposite prepared by pulsed laser ablation(Elsevier, 2024) Haladu, Shamsuddeen A.; Elsayed, Khaled A.; Ercan, Ismail; Ercan, Filiz; Kayed, T. S.; Demirci, Tuna; Yildiz, MesutPolymer nanocomposite films of cellulose propionate/styrene-maleic anhydride copolymer/molybdenum (CP/ SMAC/Mo) were fabricated by pulsed laser ablation of Mo in the polymer solution for 10, 20, and 30 min. The films were then characterized by various analytical methods. X-ray diffraction (XRD) revealed that the addition of Mo to CP/SMAC removed the crystalline peaks of Mo without changing the amorphous nature of the copolymer. According to the scanning electron microscopy (SEM) and atomic force microscopy (AFM) patterns, Mo atoms were trapped in the amorphous polymer stacks. The energy -dispersive X-ray (EDX) spectrum features C, O, and Mo. FTIR confirmed the embedding of Mo in the polymers. Thermogravimetric analysis (TGA) and differential thermal analysis (DTA) were carried out on the samples. The pristine polymer film exhibited a band gap energy of 2.9 eV, which decreased to 2.05 eV because of the loading of the Mo nanoparticles. The intensity of the photoluminescence (PL) peak of the films increases with ablation time such that the absorption intensity of the film at a lambda max of 426 nm increases by trifold during the 30 min of irradiation, which is consequently due to the increased amount of Mo in the nanostructure. The incorporation of Mo in the polymer matrix enhances the dielectric constant ( epsilon') (6.28 -18.13) and ac conductivity ( sigma ac ) (3.19 x 10 - 5 -1.12 x 10 -4 S/cm) of the polymer with negligible dielectric loss. The results suggest possible technological utilization of these materials in such applications as supercapacitors, light -emitting diodes, and organic optoelectronic devices, among others.Öğe Low-Cost synthesis of Ag-doped NiO thin Films: Their structural, optical, photocatalytic and antimicrobial properties(Elsevier, 2024) Benseghier, Sid Ahmed; Bennabi, Farid; Ercan, Ismail; Nehmar, Hamid; Khane, Yasmina; Moulayat, Nasreddine; Ercan, FilizIn this study, the influence of Ag atom doping on NiO thin films was investigated, focusing on their optical, structural, surface morphological, and chemical composition properties. The NiO thin films were doped with Ag atoms at concentrations of 2 at.% and 4 at.%, resulting in significant changes in their structural and surface morphological characteristics. Optical measurements showed variations in transmittance and optical band gap energies for the doped films compared to undoped NiO. FTIR analysis revealed distinctive peaks corresponding to Ni-O and Ag-O bonds, confirming the successful doping process. The Ag-doped NiO thin films exhibited improved antibacterial activity against E. coli and enhanced photodegradation efficiency for Methylene Blue and Malachite Green dyes. These findings highlight the potential of Ag-doped NiO thin films for applications in photocatalysis and antimicrobial materials.Öğe Pulsed laser ablation-mediated facile fabrication of MoO3/TiO2/rGO nanocomposite as a photocatalyst for dye degradation(Elsevier Sci Ltd, 2024) Al-Otaibi, Amal L.; Elsayed, Khaled A.; Manda, Abdullah A.; Haladu, Shamsuddeen A.; Gaya, Umar Ibrahim; Ercan, Filiz; Kayed, T. S.In this work, for the first time, the MoO3/TiO2/rGO nanocomposites with different weight ratios of rGO (0%, 5%, 10%, and 20%) were fabricated using pulsed laser ablation technique. The as-fabricated nanocomposites were employed for photodegradation of Methylene Blue (MB) under UV light irradiation. The morphological, struc-tural, and chemical properties of the fabricated photocatalysts were characterized using XRD, TEM, SEM, UV -DRS, XPS, FTIR, TGA, DSC, and PL. Comparative experimental studies displayed that MoO3/TiO2/rGO nano -composites fabricated with 5% rGO showed the highest photocatalytic degradation (95%) of MB under UV irradiation. This superior photocatalytic performance could be ascribed to the narrow bandgap of the fabricated nanocomposites as well as the synergistic effect of the three components.Öğe Structural, magnetic and gamma-ray shielding features of cerium doped Mg2FeTiO6 double perovskite(Elsevier, 2023) Saleh, Noha A.; Alqahtani, Muna Y.; Mhareb, M. H. A.; Ercan, Filiz; Ghrib, Taher; Kayed, Tarek S.; Özçelik, BekirThe Mg2FeTi1-xCexO6 [ x = (0, 2, 4, 6, 8, 10)%] ceramics with different Ce concentrations have been pre-pared by solid-state technique. That compounds were doped with cerium dioxide (CeO2) to develop new material for gamma radiation shielding. The prepared nanomaterials were analyzed to investigate their structural and optical properties by XRD, FTIR, SEM, magnetic properties, and UV techniques. It was de-termined by the XRPD method that the atomic and molecular structures of Ce-doped compounds were in the tetragonal crystal system and crystallized in the P4/mmm (No: 123) space group. The refinement parameters of the compound Ce doped x = 8% were gof 2.4 and Rf 0.82. The effect of the Ce doping on the magnetization was measured in the magnetic field ranging at +/- 10 kOe for two temperatures (300 and 10 K) and showed that its Saturation Magnetization (Ms) was increased with the doping increase from 6.2 to 8.1 and from 14.7 to 18.7 for the temperatures 300 and 10 K, respectively. Various radiation shielding parameters for gamma-rays, neutron, and proton were evaluated using Phy-X and SRIM soft -wares. The linear attenuation coefficient (LAC) increases gradually with adding CeO2 to Mg2FeTiO6 from 54.290 to 92.032 cm -1 at 0.015 MeV. Also, fast neutron removal cross-section ( ER ) rises from 0.077 to 0.115 cm-1 for x = 0 and x = 10%. While the sample x = 10% shows the lowest projectile range for pro-tons. This sample considers the best sample to stop protons. The Analysis demonstrates that the sample with x = 10% shows the highest gamma, proton, and neutron shielding properties nominated it to use in radiation shielding field.(c) 2022 Elsevier B.V. All rights reserved.Öğe Structural, optical, and electrical investigation of multilayered MnO2(n)/ NiO(p) heterojunctions for supercapacitors applications(Elsevier, 2023) Alanazi, Maha; Ghrib, Taher; Ercan, Filiz; Alsubaie, Mizna; Demirci, Tuna; Kaygili, Omer; Kayed, Tarek S.Heterojunctions of alternating MnO2 and NiO thin films were deposited on an Indium Tin Oxide (ITO). The MnO2 and NiO thin films were synthesized by electrodeposition and sol-gel methods respectively. The structural morphology of the synthesized heterojunctions was investigated by scanning electron microscopy (SEM) and atomic force microscopy (AFM). The microstructural and chemical compositions were examined by X-ray diffraction (XRD), Fourier transform infrared (FTIR), and Raman techniques. The optical properties were investigated by Ultraviolet-Visible (UV) analysis. The electrical conductivity, specific capacitance, and charge carrier density were determined using the Hall effect and Electrochemical impedance spectroscopy (EIS) methods. As a result, it was found that the MnO2 and NiO thin films crystallize in tetragonal and cubic crystal systems respectively. Increasing the number of NiO/MnO2 heterojunctions increases the electrical conductivity from 9.7 x 10- 7 to 1.2 x 10-3 S.cm- 1, the bandgap decreased 3.16 to 2.62 eV, the volume carrier density rises from 5.17 x 1011 to 4.62 x 1012 cm-3. The specimens constituted of two and four alternative staked MnO2 and NiO layers are characterized by a specific capacitance of 3.6 x 103 and 5.8 x 103 F.g -1 and capacitance retention of 14.8 and 12.9% which consider them promising materials for supercapacitor devices.Öğe Structural, optical, and electrical properties of Zn(1-x)MgxO nano-compounds and ZnO/Zn(1-x)MgxO heterostructures(Elsevier Science Sa, 2022) Ercan, Filiz; Alamroo, Nabilah; Ghrib, Taher; Kayed, Tarek; Özçelik, Bekir; Ercan, İsmail; Alonizan, NorahIn this study, the structural, thermal, optical, electrical and magnetic properties of Zn(1-x)MgxO (x = 0.0, 0.1, 0.3, 0.5) nano-compounds obtained by the addition of MgO to pure ZnO nano-compounds obtained by solid state reaction were investigated in detail. These nanomaterials were deposited by spin coating technique in hetero-structure of ZnO/Zn(1-x)MgxO. It was found by detailed structure solution that the crystal systems of nano materials obtained with MgO additive remained hexagonal, but the space group was transferred from P63mc to P6/mmm. The thermal gravimetry analysis shows the stability of prepared nanomaterials, the UV-Vis spectroscopy shows that the bandgap of the prepared was decreased from 3.02 to 2.52 eV with the Mg doping percentage. The Magnetization measurements at room temperature showed that all four of these Zn(1-x)MgxO nanostructures exhibited soft ferromagnetic behavior. The analysis of the ZnO/Zn(1-x)MgxO heterostructure showed that its band gap was increased from 3.69 to 3.79 eV, its carrier density was decreased from 1.14 x 10(19) to 4.20 x 10(13 )cm(-3) which introduce it as a good material to be used in optoelectronic devices field.Öğe Structural, Optical, Dielectric and Magnetic Properties of Double Perovskite Oxides A(2)FeTiO(6) (A = Zn, Mg, Cu) Nanopowders(Springer Heidelberg, 2022) Ghrib, Taher; Ercan, Filiz; Kayed, T. S.; Flemban, Tahani H.; Yıldız, Mesut; Kaygılı, Ömer; Ercan, İsmailThe investigation of structural, microstructural, optical, dielectric, and magnetic properties of double perovskite materials Zn2FeTiO6 (M1), Mg2FeTiO6 (M2), and Cu2FeTiO6 (M3) synthesized by solid-state reaction was reported in this work. The three compounds crystalized in a monoclinic structure with the space group of P12(1)/c. The microstructure of M1, M2, M3 samples was scanned by SEM to show the crystallinity in shape, and elemental mappings from EDX confirmed the consistency with sample concentrations. Similar spectra were observed from the FTIR technique. The diffused reflectance in the 200-800 nm wavelength range and photoluminescence for the samples were measured to investigate the optical properties. Dielectric constants, conductivity, frequency dependence of the tangent loss (tan delta), AC conductivity at different dc bias voltages, and the electric modulus M(omega) were examined to ensure the potential of the examined materials for microelectronic applications in circuit devices.Öğe Structure and thermal decomposition of mu-1,1-azido bridged dinuclear Fe(III) complexes(Oldenbourg Verlag, 2007) Ercan, Filiz; Ateş, B. Meltem; Aksu, Levent; Sözeri, Hüseyin; Ercan, İsmail; Atakol, OrhanFe(III) complexes were prepared by the reaction of two different ONNO type Schiff bases N,N'-bis (salicylidene)-1,3-propanediamine (LH2) and N,N'-bis (salicylidene)-2,2'-dimethyl-1,3-propane diamine (LDMH2) in N-3(-) containing medium. The X-ray diffraction studies revealed that the complexes are of dinuclear type connected with mu-1,1-azido bridges. It was observed from the thermogravimetric analyses of the complexes that the azide group decomposed around 200 degrees C with exothermic reaction. This exothermic decomposition did not affect the rest of the molecule. Following the decomposition of the azide group the remainder of the molecule decomposed with carbonization process. It was seen that the molecule decomposed into Fe2O3 above 650 degrees C in oxygen containing medium. [FeLDMN3](2) complex was found to have N4O2 distorted octahedral sphere with Fe...Fe distance of 3.414 angstrom.Öğe Synthesis and Structural Characterization of Y-doped Pyramidal ZnO Powders(2020) Seçkin, Turgay; Köytepe, Süleyman; Okur, Havva Esma; Ercan, Filiz; Ercan, Ismail; Ateş, Tankut; Yahıa, I.S.The present study focuses on the structural changes in ZnO powder induced by doping of a rare earth metal of Y.For this aim, we synthesized four ZnO samples with different Y-content using the combustion reaction method.X-ray powder diffraction (XRPD) technique and scanning electron microscopy (SEM) results confirm that the asinvestigated structural parameters and morphology of the ZnO structure were affected directly by the concentrationof Y dopant. For each Y-doped sample, randomly-oriented pyramidal morphology and the formation of a minorityphase of Y2O3 were observed. A gradual increase in both lattice parameters and unit cell volume was detected withincreasing Y content. All samples were found to be thermally stable in the temperature interval of 25-950 °C.Öğe Synthesis of Ag nanoparticles-decorated on CNTs/TiO2 nanocomposite as efficient photocatalysts via nanosecond pulsed laser ablation(Elsevier Sci Ltd, 2022) Alheshibri, Muidh; Elsayed, Khaled; Haladu, Shamsuddeen A.; Magami, Saminu Musa; Al Baroot, Abbad; Ercan, İsmail; Ercan, FilizA simple, reproducible, and non-surfactant self-templating approach was developed for the synthesis of silver nanoparticles decorated on CNTs/TiO2 nanocomposite via a nanosecond pulsed laser ablation method. In addition, the effective use of the resulting nanocatalysts was carried out in the enhanced photocatalytic degradation of methylene blue dye contaminant. Following the synthesis of the nanocomposite catalysts, their morphology, heterostructure, and the nature of incorporation of their constituents were confirmed by TEM and SEM microscopy. In addition, characteristic diffraction patterns of the materials were studied by XRD powder diffraction method, confirming the crystalline nature of the nanocatalysts. The photoluminescence (PL) analysis provided information about the surface defects present as well as the electron-hole recombination properties of the prepared nanocatalysts. Despite the poor ultraviolet light absorption of the neat CNT and the TiO2 constituents beyond 400 nm, an efficient ultraviolet light-induced photodegradation of the methylene blue dye was successfully achieved. In this, by carrying out 50 min of ultraviolet light irradiation of the dye in the presence of the TiO2/CNT and the Ag/TiO2/CNT nanocomposite catalysts, 89.8% and 96 % reduction efficiencies were achieved, respectively. The experimental error associated with the photodegradation efficiency was within +/- 3%. The ultraviolet light-induced catalytic degradation of the dye follows first-order reaction kinetics, with rate constants of 3.95 x10-2 min-1 and 4.56 x 10-2 min-1 associated with the TiO2/CNT and the Ag/TiO2/CN catalyzed reactions, respectively.
