IMPACT OF SULFUR ION CONCENTRATION ON THE OPTICAL AND STRUCTURAL CHARACTERISTICS OF Ag Ag2S Core Shell NANOSTRUCTURES

Summary: In this study, silver nanoparticles (AgNPs) were synthesized via chemical reduction. Then Ag-Ag2S core-shell structures were synthesized by simply mixing different concentrations of Na2S aqueous solution (5,10 and 15mM) and AgNPs. The structural and optical properties of these structures were analyzed. Changes in the structure of the samples were analyzed by X-ray diffraction (XRD). The optical properties and bandgap values were studied using ultraviolet-visible (UV-Vis) spectroscopy. The structural and optical properties of AgNPs revealed clear differences in their physical properties after sulfidation. From the study of optical properties, we determined that Ag-Ag2S core-shell structures have broadband absorption properties that can be controlled by changing the concentration of sulfur ions in the sulfidation process. Also, because of sulfidation, it was determined that the value of the bandgap of Ag-Ag2S structures changes.