Yazar "Kayed, T. S." seçeneğine göre listele

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    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, Mesut
    Polymer 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.
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    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.
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    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, İsmail
    The 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.