Synthesis and Characterization of ZnS:Ag Nanocrystals Surface-capped with Thiourea

摘要

Ag^+-doped ZnS nanocrystals surface-capped with thiourea(expressed as ZnS∶Ag/thiourea) were synthesized through sol-gel method with thiourea as a surface modifier and characterized by X-ray diffraction(XRD), transmission electron microscope(TEM), X-ray fluorescence spectrum(XRF), infrared spectrum(IR), UV-Vis absorption spectrum(UV-Vis), and photoluminescence spectrum(PL). The results show that Ag^+ ions are doped in ZnS nanocrystals, and the sulfur atoms in thiourea molecules coordinate with metal ions on the surface of the nanocrystals. The spherical ZnS∶Ag/thiourea nanocrystals with an average diameter of 5 nm have good fluorescent characteristics, and therefore have great potential for use in molecular assembly and novel luminescence materials.