【摘要】 先采用一步溶剂热法和水热法制备了碳包覆的Ag@Fe₃O₄核壳型磁性纳米粒子,然后通过表面氨基化改性后与巯基乙酸修饰的CdTe量子点反应,将量子点键合到磁性微球上,最后在其表面包覆上一层二氧化硅壳层,制备出具有荧光增强的Ag@Fe₃O₄@C-CdTe@SiO2磁性荧光复合材料。实验结果表明,该纳米粒子的平均粒径大约为150nm,磁饱和强度为224A/g（22.4emu/g）,在室温下具有较好的磁性能。其中Ag@Fe₃O₄@C-CdTe磁性荧光纳米粒子的荧光强度大于Fe₃O₄@C-CdTe,其主要原因是内核为45nm的Ag纳米粒子具有表面等离子体共振作用,能够使其表面或附近的量子点荧光得到增强。更多还原

【Abstract】 Novel hybrid nanoparticles Ag@ Fe₃O₄@ C-CdT e@ SiO 2were 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 CdT e quantum dots（ QDs） on the surface of Ag@ Fe₃O₄@ C-PEI（ Ag@ Fe₃O₄@ C-CdT e）,and an ordered SiO 2structured 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-CdT e nanostructures in this composite with the Ag cores of about 45 nm has more enhancement compared with that of Fe₃O₄@ C-CdT e nanostructures due to the strong surface plasmonic resonance of the Ag cores.更多还原