首先通过共沉淀法制备酒石酸钠(ST)稳定的Fe3O4(四氧化三铁)纳米粒子(简称Fe3O4@ST),其次以酒石酸钠为双功能还原剂利用种子生长法获得Fe3O4@ST@Ag磁性复合纳米粒子。考察了不同反应体系、反应时间、Fe3O4@ST含量等因素对合成Fe3O4@ST@Ag复合纳米粒子的影响,通过紫外-可见分光光度计(UV-2450)、场发射扫描电子显微镜(SEM)以及动态光散射仪(DLS)等仪器对Fe3O4@ST和Fe3O4@ST@Ag复合纳米粒子进行系统表征。结果表明:最优条件下获得的Fe3O4@ST@Ag复合纳米粒子呈球状结构,平均粒径为31nm左右并在372nm处明显出现强而窄的Ag纳米粒子表面等离子体特征吸收峰。此外,Zeta电位结果显示Fe3O4@ST@Ag复合纳米粒子表面带有大量负电荷,归因于酒石酸钠分子中含有大量的羧基,说明其兼有稳定剂和还原剂的功能。
Firstly,sodium tartrate(ST) used as a mild stabilizer to synthesis the well-dispersed Fe3O4 magnetic nanoparticles (Fe3O4@ST) in water by simple modified coprecipitation method.Secondly,sodium tartrate acted as a difunctional reducing agent to prepare Fe3O4@ST@Ag nanocomposites by using simple reflux method.The effects of different reaction systems,reaction time and the content of Fe3O4@ST on the synthesis of Fe3O4@ST@Ag nanocomposites were discussed.The synthesis of Fe3O4@ST and Fe3O4@ST@Ag nanoparticles was characterized by ultraviolet-visible spectrophotometer (UV-2450),field emission scanning electron microscopy (SEM) and dynamic light scatter (DLS).The results showed the obtained Fe3O4@ST@Ag nanoparticles under the optimal conditions exhibited a spherical structure with an average particle size about 31nm,and appeared a strong and narrow Ag nanoparticles plasma characteristic absorption peak at 372nm.In addition,zeta potential results showed the surface of Fe3O4@ST@Ag had plenty of negative charges,due to numerous carboxyl groups of ST molecule which not only possessed reduction but also as stabilization functions.
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