Cadmium selenide@sulfide nanoparticle composites: Facile precipitation preparation, characterization, and investigation of their photocatalyst activity

We report a two-step synthesis and structural characterization of CdSe/CdS core/shell nanoparticles by the precipitation method. Besides, the effects of preparation parameters such as reaction temperature, the speed of the reaction stirrer, and the rate of adding sulfide source on the size, morphology, and photocatalyst activity of CdSe/CdS core–shell nanoparticles were studied by SEM images and degradation of methyl orange (MO) dye test. The structure and composition of the obtained products were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), high-resolution field-emission transmission electron microscope (HRTEM), photoluminescence spectroscopy (PL), scanning electronic microscopy (SEM), spectra energy dispersive analysis of X-ray (EDS), and ultraviolet–visible (UV–vis) techniques.