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先采用一步溶剂热法和水热法制备了碳包覆的Ag@Fe_3O_4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@Fe_3O_4@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@Fe_3O_4@C-CdTe磁性荧光纳米粒子的荧光强度大于Fe_3O_4@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。
Carbon-coated Ag @ Fe_3O_4 core-shell magnetic nanoparticles were prepared by one-step solvothermal method and hydrothermal method, and then were quantum dot-bonded to the CdTe QDs modified with thioglycolic acid through surface modification Finally, a silica shell was coated on the surface of the magnetic microspheres to prepare Ag @ Fe_3O_4 @ C-CdTe @ SiO2 magnetic fluorescent composites with enhanced fluorescence. The experimental results show that the average particle size of the nanoparticles is about 150nm, the magnetic saturation intensity is 224A / g (22.4emu / g), and has good magnetic properties at room temperature. The fluorescence intensity of Ag @ Fe_3O_4 @ C-CdTe magnetic fluorescent nanoparticles is larger than that of Fe_3O_4 @ C-CdTe. The main reason is that Ag nanoparticles with 45nm core have surface plasmon resonance, which can make the quantum dots on or near the surface fluorescently Be enhanced.