One step synthesis of silica-coated nanoparticles at room temperature and their luminescence properties

摘要

A novel one-step preparation method for core-shell CdS/SiO_2 nanoparticles was proposed using 3-mercaptopropyl-trimethoxysilane (MPS) as stabilizing agent in MeOH, in which CdCl_2·2.5H_2O and Na_2S·9H_2O were used as the source of Cd and S, respectively. And the photostability of the nanoparticles was further investigated. The morphology and structure of products was characterized by scanning probe microscope and FT-IR spectra, respectively. Furthermore, the influences of Zn and Cu doped in the products, individually, on the fluorescence property were discussed. The results showed that the products were ball-shaped and silica-coated with a uniform size, the spectra of Zn-doped was blue shifted, however, the spectra of Cu-doped was red shifted, the core-shell CdS/SiO_2 nanoparticles was more steady compared with thioglycolic acid-capped CdS nanoparticles.