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通过微乳法一步合成了SiO_2包覆Fe_3O_4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Fe_3O_4@SiO_2@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~(-5)mol/L。
One-step synthesis of magnetic nanoparticles (MNP) coated with Fe_3O_4 by microemulsion method and surface-amination by silane coupling agent further modified anthracene by chemical bonding to the surface of the aminated nanoparticles to prepare Fe_3O_4 @ SiO_2 @ An magnetic nano-fluorescent particles. The particles were characterized by XRD, TEM and FTIR. The diameter of the particles was about 9 nm. Superparamagnetism was observed at room temperature. The particles were separated from the solution easily and effectively by the applied magnetic field. The particles have good dispersibility in the solvent. Fluorescence experiments show that the particles have good selectivity for zinc ions, the fluorescence intensity of the particles is significantly enhanced by the mechanism of photoinduced electron transfer (PET) in the presence of zinc ions, The detection limit was 2.8571 × 10 ~ (-5) mol / L.