摘要
首先通过化学共沉淀法制备出Fe3O4磁性纳米颗粒,考察了表面活性剂的用量、碱的用量、陈化时间以及三价铁与二价铁的摩尔比等因素对Fe3O4纳米颗粒性能的影响。制备出饱和磁化强度为73.85A.m2/kg、粒径大小为10nm以下的Fe3O4纳米颗粒。在此基础上,制备出Fe3O4/Au复合纳米颗粒,通过VSM、TEM、XRD、XPS对产物进行了表征,研究了HAuCl4的用量、还原剂的种类、硅烷偶联剂以及包金之前的Fe3O4纳米颗粒对复合颗粒的影响,结果表明所制得的Fe3O4/Au复合磁性纳米颗粒包覆良好,粒径大小为50～200nm,饱和磁化强度为10.08A.m2/kg。
The Fe3O4 magnetic nanoparticles were prepared by the method of chemical co-precipitation first,the effect factors of influencing the properties of magnetic nanoparticles,such as precipitator selection,the quantity of precipitator and the way of addition,aging time,quantity of surfactant and Fe2＋/Fe3＋ molar ratio were studied by authors.The saturation magnetization of prepared Fe3O4 magnetic nanoparticles is 73.85A·m2/kg,and the particle diameter is below 10nm.Then,the Fe3O4/Au composite nanoparticles were prepared and characterized by VSM,TEM,XRD,XPS means.The authors studied the influence of the amount of HAuCl4,the kind of reducing agent,silane coupling agent,as well as Fe3O4 nano-particles before coating Au on the properties of composite particles,the results show that the obtained Fe3O4/Au composite nanoparticles are well-coated,particle size is 50-200nm,saturation magnetization is 10.08A·m2/kg.
出处
《功能材料》
EI
CAS
CSCD
北大核心
2011年第8期1429-1432,1435,共5页
Journal of Functional Materials
基金
国家自然科学基金资助项目(50875017)
