链霉亲和素-异硫氰酸荧光素偶联核壳型Fe_3O_4/Au纳米晶的合成及性质

采用改进的Polyol合成法,以PEO-PPO-PEO为表面活性剂制备了链霉亲和素-异硫氰酸荧光素偶联的Fe3O4/Au纳米粒子;利用透射电镜和X射线衍射仪分析证实了Fe3O4/Au的核壳型纳米结构,确定了其粒径和分布;采用紫外-可见吸收光谱仪和荧光光谱仪测定了所制备的纳米粒子的光学活性和荧光特性,并采用振动样品磁强计(VSM)测量了其磁化率.结果表明,所制备的Fe3O4/Au纳米粒子具有光学活性和荧光特性,以及优异的磁性.

Synthesis and Properties of Streptavidin-FITC-Conjugated Fe3O4/Au Nanoparticles with Core-Shell Structure

Streptavidin-fluorescein isothiocyanate （STA-FITC） conjugated Fe3O4/Au nanoparticles with core shell structure were synthesized via a modified polyol process by using poly（eth- ylene glycol）-block-poly（propylene glycol）-block-poly-（ethylene glycol） （PEO-PPO-PEO） polymer as the surfactant. The core-shell structure of the resulting nanoparticles was verified by means of transmission electron microscopy and X-ray diffraction, and their grit size and size distribution were then determined. At the same time, an ultraviolet-visible light absorbance spectrometer was performed to evaluate the surface plasmon characteristic and photoluminescence properties of the as-prepared nanoparticles. And a vibrating sample magnetic meter was used to examine the magnetic properties of the nanoparticles. It has been found that the as-prepared Fe3O4/Au nanopa＇rticles have optical and fluorescent activity as well as excellent magnetism.