Fe3O4@SiO2@An磁性纳米荧光粒子的制备及对锌离子的识别

通过微乳法一步合成了SiO2包覆Fe3O4的磁性纳米颗粒(MNP)并通过硅烷偶联剂将表面氨基化,进一步通过化学成键将荧光分子蒽修饰到氨基化的纳米粒子表面,制得Fe3O4@SiO2@An磁性纳米荧光粒子.采用XRD、TEM、FTIR等实验方法对该粒子进行一系列的表征,其直径约为9nm,常温时具有超顺磁性,通过外加磁场,能够使粒子从溶液中简单有效地分离.该粒子在溶剂中具有较好的分散性,荧光实验表明,对锌离子具有较好的选择性,在锌离子存在下基于光诱导电子转移( PET,PhotoinducedElectron Transfer)机理,粒子荧光强度显著增强,检出限为2.8571×10-5mol/L.

Synthesis of Magnetic Nano Fluorescent Particles Fe3O4@SiO2@An and Identification of Zinc Ions

Silica-coated iron oxide magnetic nanoparticles（MNP） were synthesized by one-step microemulsion method,and the surface of the compound was aminated by amino-silane coupling agent.Subsequently fluorescent molecular anthracene was grafted to the surface via an amide bond. The anthracene modified nanoparticles（AMNP） were characterized by XRD,TEM and FTIR.The nanoparticles had a superparamagnetic property at room temperature with the diameter of 9nm around,and that can be easily and effectually seperated from the solution in the presence of an external magnet.The particles had good dispersion in solvent,and fluorescence experiments showed that the particles had excellent selectivity for zinc ions.The particles exhibited fluorescence increase upon the binding of the Zn²⁺ based on the inhibition of the photoinduced electron transfer quenching mechanism.The fluorescence detection limit for zinc ions was 2.8571×10^-5mol/L.