core-shell structure

In this study, nanocomposites with core-shell structure consisting of nickel ferrite and zinc sulfide were fabricated by rapid chemical method with the aim of enhancing the photocatalytic properties and were investigated in the ultraviolet region. Therefore, first samples containing nickel ferrite nanoparticles (NiFe2O4) were synthesized by co-precipitation method, then NiFe2O4-Zns nanocomposite with average diameters of 66 nm was made. The morphology and microstructure of the nanocomposites produced were investigated using X-ray diffraction (XRD), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). XRD analyzes show that the constructed nanostructures have a structure with a crystalline dominant phase. The magnetic properties of nanoparticles and nanocomposites prepared at room temperature were investigated using an alternating force gradient magnetometer (AGFM). The sample of nanocomposites produced using ultraviolet-visible (UV-Vis) optical spectrometer and the effect of the amount of adsorbent and irradiation time on the percentage reduction of dye concentration of solutions were investigated. The aqueous and methyl orange acids tested in the presence of the nanocomposite were significantly reduced, which is confirmed by the photocatalytic properties of the nanocomposite, which ultimately led to a reduction in the concentration of dyes used.

In the present research, nanoparticles and silicon nanoparticles were synthesized using gold catalyst by chemical vapor deposition methods and liquid-solid vapor VLS techniques at different times. The Nano structural properties of the synthesized samples were investigated using experimental techniques of scanning electron microscopy SEM, transmission electron microscopy TEM and X-ray diffraction XRD. The results of SEM images showed nanoparticles with spherical morphology with diameters in the range of 60 to 180 nm and nanoparticles with needle morphology. XRD analysis confirmed the presence of crystalline phase silicon peaks in the synthesized sample. The results of TEM and Raman show the inner structure of the samples at 10 and 20 nm scales as crystalline core-shell, respectively.