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以共沉淀法制备出表面羟基化的四氧化三铁(Fe_3O_4)磁性颗粒,通过柠檬酸(CA)修饰制备出Fe_3O_4/CA。三步法合成出具有较好荧光性能的CdSe(硒化镉)/CdS(硫化镉)量子点,并经锰(Mn)元素改性,使其具备更好的荧光特性。巯基乙酸(C_2H_4O_2S)为改性后量子点提供连接基团,经乙二胺(C_2H_8N_2)与Fe_3O_4/CA相连接。该材料经荧光分光光度计、荧光显微镜、透射电子显微镜(TEM)和振动样品磁强计(VSM)的表征。结果表明:通过乙二胺的连接(静电吸附及氢键作用),经Mn改性后的CdSe/CdS量子点成功与Fe_3O_4/CA连接,形成了具备磁性荧光双功能的复合材料,饱和磁化强度达到28.86emu/g,其优秀的磁性荧光性能在药物分离、靶向治疗等方面具有很高的应用价值。
The surface hydroxylated ferroferric oxide (Fe_3O_4) magnetic particles were prepared by coprecipitation, and Fe_3O_4 / CA was prepared by citric acid (CA) modification. The CdSe (cadmium selenide) / CdS (cadmium sulfide) quantum dots with good fluorescence properties were synthesized by the three-step method and modified by manganese (Mn) to make them have better fluorescence characteristics. Thioglycolic acid (C_2H_4O_2S) provides a linker for the modified QDs and is connected to Fe_3O_4 / CA via ethylenediamine (C_2H_8N_2). The material was characterized by fluorescence spectroscopy, fluorescence microscopy, transmission electron microscopy (TEM) and vibrating sample magnetometer (VSM). The results show that the CdSe / CdS QDs modified by Mn were successfully connected with Fe_3O_4 / CA via ethylenediamine attachment (electrostatic adsorption and hydrogen bonding) to form a composite with dual magnetic properties. The saturation magnetization Reached 28.86emu / g, its excellent magnetic fluorescence properties in drug separation, targeted therapy has a high value.