SiO_2包覆FePt磁性纳米颗粒的制备和其磁性能  

Synthesis of silica oxide-coated FePt magnetic nanoparticle and its magnetic properties

作　　者：杜雪岩[1,2] 郭海霞[1,2] 李翠霞[1,2] 李芳[1,2] 

机构地区：[1]兰州理工大学甘肃省有色金属新材料重点实验室,甘肃兰州730050 [2]兰州理工大学有色金属合金及加工教育部重点实验室,甘肃兰州730050

出　　处：《兰州理工大学学报》2010年第3期22-24,共3页Journal of Lanzhou University of Technology

基　　金：甘肃省自然科学基金(0916RJZA019)

摘　　要：分别以乙酰丙酮铁(Fe(acac)3)和氯铂酸(H2PtCl6.6H2O)作为Fe源和Pt源,硼氢化钠(NaBH4)作为还原剂,通过化学还原法制备FePt纳米粒子.配制出OP-10/正丁醇/环己烷/浓氨水/的反相微乳液.采用反相微乳液法实现SiO2对FePt纳米粒子的硅层包覆.运用X射线衍射仪(XRD),透射电子显微镜(TEM)和振动样品磁强计(VSM)对FePt@SiO2复合纳米粒子进行表征.结果表明:SiO2成功包覆在FePt表面,且磁性纳米复合粒子饱和磁化强度几乎不变,矫顽力趋近于零,仍显示超顺磁性.Taking Fe（acac）3 and H2PtCl6·6H2O as Fe ions source and Pt ions source,respectively,and NaBH4 as reductant,the FePt nanoparticles were synthesized by using chemical reduction method.Reverse microemulsion were made of OP-10/buty alcohol/cyclohexane/water.Then,FePt@SiO2 nanoparticles were prepared with a water-in-oil microemulsion method.The nanocomposite particles were characterized by X-ray powder diffraction（XRD）,transmission electronmicroscopy（TEM）,and vibrating sample magnetometer（VSM）.The result showed that the primary silica was coated successfully on the surface of FePt nanoparticles and their saturation magnetization almost did not change.The coercivity of the nanocomposite particles was near zero,implying that the nanocomposite particles were superparamagnetic.

关 键 词：FEPT SIO2 反相微乳液 包覆 

分 类 号：TB383[一般工业技术—材料科学与工程]