Synthesis And Photoluminescence Properties Of Silica-coated Core-shell Nanoparticles

Inorganic nanomaterials have a major prospect in the biomedical field asfluorescent probes. SiO₂can suppresse the surface defects nanoparticles and improvethe luminescent properties and then couple biological molecules. In recent yearsZnO/SiO₂core-shell structure and QDs/SiO₂core-shell structure nanoparticlesfluorescent probes of biological research received increasingly widespread concern. ForZnO/SiO₂, QDs/SiO₂core-shell structure and the control of core-shell structurenanoparticles were prepared and modulating its photoluminescence has importantscientific significance and practical value.In this paper, based on the above research background for QDs-SiO₂core-shellnanostructures and photoluminescence study of this research, we use the liquid-phasesynthesis method and the microemulsion method to study the ontrollable preparationand photoluminescence properties about ZnO nanoparticles, ZnO-SiO₂core-shellstructure of nanoparticles and QDs-SiO₂core-shell nanoparticles. We study about theliquid phase synthesis of ZnO nanoparticles growth characteristics to achieve the ZnOnanoparticle morphology and luminescence band modulation, meanwhile study toachieve a synthesis of monodisperse ZnO-SiO₂core-shell nanoparticles by preparationof SiO₂cladding realized under luminous intensity of ZnO doubled in the solution. Weprepared different size and different luminescence properties of ZnO nanoparticles bythe reverse microemulsion method and under SiO₂coated ZnO nanoparticles have alsoproved the SiO₂coating significantly enhanced luminescence properties of ZnO. Wehave coated the CdSe/ZnS quantum dots with SiO₂and studied through the regulationof experimental parameters and then control the morphology of structural ofCdSe/ZnS-SiO₂core-shell nanoparticles luminescence properties.Results of these studies will greatly promote the understanding for QDs-SiO₂core-shell nanostructures and photoluminescence. More importantly, this research willpromote practical applications of ZnO-SiO₂and QDs-SiO₂core-shell nanoparticles inthe biomedical field.