Preparation and characterization of polymer-capped CdS nanocrystals Original Research Article

Poly(vinyl pyrrolidone) (PVP)-capped CdS nanoparticles were prepared with CS2 as the sulfur source through the hydrothermal process. The obtained nanoparticles were characterized by X-ray diffraction, transmission electron microscopic, ultraviolet–visible and fluorescence spectroscopy. The capped CdS nanoparticles showed remarkable stability and significantly enhanced luminescence property compared with that of the noncapped ones. We attributed this observation to the surface passivation of the CdS nanoparticles by the PVP molecules.