Magnetic and Optical Properties of Ag@Fe3O4@C-CdTe@SiO2 Hybrid Nanoparticles

Novel hybrid nanoparticles Ag@Fe3O4@C-CdTe@SiO2 were prepared. The synthesis method is included of a Fe3O4 magnetic embedded Ag core (Ag@Fe3O4), an interlayer of carbon modified by PEI to form sufficient amounts of amine functional groups (Ag@Fe3O4@C-PEI), the grafting of CdTe quantum dots (QDs) on the surface of Ag@Fe3O4@C-PEI (Ag@Fe3O4@C-CdTe), and an ordered SiO2 structured shell. The nanocomposites possess an average diameter of 150 nm, orange emission feature and the saturation magnetization of 224 A/g (22.4 emu/g), which has room temperature ferro-magnetism. The photoluminescence measurement reveals that the fluorescence of Ag@Fe3O4@C-CdTe nanostructures in this composite with the Ag cores of about 45 nm has more enhancement compared with that of Fe3O4@C-CdTe nanostructures due to the strong surface plasmonic resonance of the Ag cores. © 2017, Science Press. All right reserved.