Citation: ZHOU Xiang, WANG Xiu-Ling, LIU Yong-Jian, CHEN Yong-Bing, LIU Min. Preparation and Characterization of Fe3O4/PEI/Au@CdSe/CdS Multifunctional Composite Materials[J]. Chinese Journal of Inorganic Chemistry, ;2015, (6): 1165-1170. doi: 10.11862/CJIC.2015.150
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Fe3O4 nanoparticles were prepared by coprecipitation, which were modified by polyethyleneimine(PEI). Au nanoparticles were composited in situ, and then the Fe3O4/PEI/Au microspheres were obtained. CdSe/CdS QDs was modified with thioglycolic acid, and connected to magnetic nanoparticles. Fe3O4/PEI/Au@CdSe/CdS multifunctional composite microspheres were prepared successfully. Fourier transform infrared spectroscopy (FTIR), Fluorescence spectrophotometer, Fluorescence microscopy, X-ray diffraction (XRD), Transmission electron microscopy (TEM) and Vibrating sample magnetometer (VSM) are used for characterizing. The results shows that: the multifunctional composite microspheres with the size about 40 nm were superparamagnetic and remanence; the coercivity is near zero; the saturated magnetization is 28.83 A·m2·kg-1. What's more, the microspheres have both superior fluorescence and gold nanoparticles' properties.
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