采用水热合成法和Stber法制备了氨基功能化SiO2包覆的Fe3O4磁性纳米微球Fe3O4@SiO2-NH2, 它与巯基乙酸修饰的CdTe量子点通过酰胺缩合反应, 将量子点键合到磁性微球上, 制备出单分散性的Fe3O4@SiO2@CdTe磁性荧光双功能微球.用透射电子显微镜、X-射线衍射仪、荧光分光光度计、振动样品磁强计表征了该纳米复合微球的结构和性能.结果表明: Fe3O4@SiO2@CdTe磁性荧光复合微球单分散性好, 平均粒径为470 nm, 饱和磁化强度为37.9 emu/g, 具有良好的超顺磁性和较高的荧光发光效率.

Monodisperse Fe3O4@SiO2@CdTe magnetic and luminescent double functional composite microsphere were successfully prepared by amide condensation reaction with Fe3O4 magnetic nanoparticles coated by SiO2 with －NH2, which were got by hydrolyzing with (3-ammonium propyl) triethoxy silane and CdTe quantum dots modified by thioglycolic acid. Fe3O4 magnetic nanoparticles were received by hydrothermal synthesis method and stber method. The structures and properties of the composite microsphere were characterized by transmission electron microscopy, X-ray diffraction, fluorescence spectrophotometer and vibrating sample magnetometer. The results demonstrated that Fe3O4@SiO2@CdTe magnetic and luminescent composite microspheres have good monodispersity, the average particles size is 470 nm and the saturation magnetization is 37.9 emu/g. The submicron magnetic and luminescent composite particles have well superparamagnetism and high efficiency fluorescent light.