In the present research, the fabrication and characterization of ZnS urchin-like nanoparticles (ULNPs) via simple, template free and onestep hydrothermal method are reported. Zinc acetate dihydrate, thiosemicarbazide and ethylenediamine are utilized as precursors. Nanostructure characterization of three-dimension ZnS ULNPs is specified by X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive x-ray spectroscopy (EDX), transmission electron microscopy (TEM), Fourier transform infrared (FT-IR) and ultraviolet-visible (UV-Vis) spectroscopy. The photocatalytic activity of ZnS NPs is determined by measuring the degradation of an organic dye methylene orange (MO) under UV-irradiation. The lattice characteristics such as nanocrystallite size, strain, stress, and deformation energy density are specified using Williamson-Hall (W-H) and Halder-Wagner (H-W) analysis with different considerations about the isotropic nature of the crystal. XRD analysis reveals that ZnS NPs are hexagonal wurtzite phase. The shape and mean diameter of NPs are demonstrated by TEM and SEM techniques to be 3D urchin-like with an average size of 60 nm. N2 adsorption-desorption and UV-Vis spectroscopies are utilized to specify the optical characteristics such as mean pore diameter, total pore size, and BET special surface area. The band gap of fabrication ZnS NPs has been evaluated from the Tauc equation and absorption edge to be 3.84 eV.
Synthesis of TiO 2-Al 2 O 3-SiO 2 nanopowder composite, as well as composite coating on soda lime glass and Si (100) by sol-gel method is reported. The morphology and the crystal structure of composite are characterized by the use of field emission scanning electron microscopy (FE-SEM), Energy dispersive X-ray (EDAX), atomic force microscopy (AFM) and X-ray diffraction (XRD) techniques. The effects of chemical compositions and Calcination temperature on surface topography and the crystallization of phases are studied. In addition, the lattice strain and coating roughness parameters are calculated during thermal treatment.
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