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以FeCl_3·6H_2O和FeSO_4·7H_2O为原料,制得磁性Fe_3O_4纳米颗粒。利用静电吸引合成了双甘膦包裹的Fe_3O_4/双甘膦(PMIDA),使磁性微球表面连上大量的功能基团羧基,再与乙二胺通过键合使磁性微球外面修饰着氨基。将修饰过巯基乙酸的量子点CdSe/CdS与磁性微粒混合,量子点表面的羧基与Fe_3O_4表面的氨基进行连接。对其进行荧光分光光度计,透射电子显微镜(TEM)、振动样品磁强计(VSM)和荧光显微镜等表征,结果表明:复合后的微球具备很好的发光性能和优越的磁性能。
With FeCl 3 · 6H 2 O and FeSO 4 · 7H 2 O as raw materials, magnetic Fe 3 O 4 nanoparticles were obtained. The PMIDA-encapsulated Fe_3O_4 / PMIDA was synthesized by electrostatic attraction, a large number of carboxyl groups were attached to the surface of the magnetic microspheres, and amino groups were modified on the surface of the magnetic microspheres by bonding with ethylenediamine. The quantum dots CdSe / CdS modified with thioglycolic acid were mixed with magnetic particles, the carboxyl groups on the surface of the quantum dots were connected with the amino groups on the surface of Fe_3O_4. Fluorescence spectrophotometer, transmission electron microscopy (TEM), vibrating sample magnetometer (VSM) and fluorescence microscopy were used to characterize the microspheres. The results showed that the composite microspheres possessed good luminescent properties and excellent magnetic properties.