Fe3O4@Au核壳纳米颗粒的制备及表征
Preparation and Characterization of Fe3O4@Au Core-shell Nano-particle
葛兆强1, 刘翠翠1, 张根义1, 沈晓芳1,2
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作者单位：(1. 江南大学 食品学院, 江苏 无锡 214122; 2. 江南大学 食品科学与技术国家重点实验室, 江苏 无锡 214122)
中文关键字：Fe3O4@Au； 核壳型磁性纳米颗粒； 制备； 表征
英文关键字：Fe3O4@Au; core-shell magnetic nano-particles; synthesis; characterization
中文摘要：采用共沉淀法制备Fe3O4磁性纳米颗粒，并在此基础上采用柠檬酸钠还原HAuCl4的方法制备Fe3O4@Au核壳纳米颗粒。通过透射电镜(TEM)、能量衍射光谱(EDS)、傅立叶变换红外光谱(FT-IR)、X-射线衍射仪(XRD)分别对产物的形貌、结构和组成等性质进行表征。结果表明：Au成功包裹在Fe3O4纳米颗粒表面，所制得的Fe3O4@Au核壳纳米颗粒在水中的分散性较好，粒径比较均匀，为(15±5) nm；且当Fe3O4和Au摩尔比为5 ∶ 1时，制备的Fe3O4@Au核壳纳米颗粒的磁性较好。
英文摘要：Fe3O4 magnetic nano-particles were prepared by co-precipitation method and then the above particel was used as seeding materials for the reduction of gold precursors to produce gold-coated Fe3O4 nano-particles (Fe3O4@Au). The synthesized nano-particles were characterized by transmission electron microscopy(TEM), energy dispersive spectrometer (EDS), fourier-transform infrared (FTIR) spectrum and X-ray diffraction. The Fe3O4@Au nano-particles have a particle size of (15±5) nm and can be quickly separated in solution by an external magnet. The Fe3O4@Au particle has the better magnetism when the mole ratio of Fe3O4 and Au is 5 ∶ 1.