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Magnetic-fluorescent bifunctional Fe3O4 /SiO2-CdTeS nanocomposites are synthesized.Fe3O4 superparamagnetic nanoparticles are firstly prepared through the thermal decomposition of Fe oleate precursors and coated with a mesoporous silica shell using the St(o)ber method,and the silica surface is then modified with positively charged amino groups by adding 3-aminopropyltrimethoxysilane.Finally,negatively charged CdTeS quantum dots are linked and assembled onto the positively charged surface of Fe3O4/SiO2 through electrostatic interactions.X-ray diffraction,transmission electron microscopy,photoluminescence spectroscopy,and magnetometry are applied to characterize the nanocomposites.The results show that the bifunctional nanocomposites combine the optical properties of near-infrared CdTeS quantum dots with the superparamagnetic properties of Fe3O4 perfectly,expressing the potential application as a biocompatible magnetofuorescent nanoprobe for in vivo labelling.