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单分散性Fe_3O_4/CoO/SiO_2复合纳米粒子的制备与表征
引用本文:孙莉,刘福田,姜庆辉,孙雪娇,陈秀秀.单分散性Fe_3O_4/CoO/SiO_2复合纳米粒子的制备与表征[J].中国陶瓷工业,2010,17(6):1-5.
作者姓名:孙莉  刘福田  姜庆辉  孙雪娇  陈秀秀
作者单位:济南大学材料科学与工程学院;
摘    要:采用溶剂热法,在160℃下,以聚乙烯吡咯烷酮(PVP)为表面活性剂,制备Fe3O4/CoO复合纳米粒子;然后采用St觟ber法,在35℃下,以氨水催化正硅酸乙酯(TEOS),制备Fe3O4/CoO/SiO2复合纳米粒子。考察反应物配比、氨水浓度、醇水比对Fe3O4/CoO/SiO2复合粒子磁学性能的影响。对复合纳米粒子采用X射线衍射(XRD)、透射电子显微镜(TEM)、交流梯度磁强计(VSM)、差热分析(DTA)等手段进行表征分析。结果表明:Fe3O4/CoO/SiO2复合纳米粒子晶形生长良好,粒径在20nm左右。利用CoO进行表面修饰后,提高了纳米Fe3O4粒子的饱和磁化强度,通过包覆SiO2进行表面改性后,提高了纳米Fe3O4粒子的分散性和稳定性。实验确定了Fe3O4/CoO复合粒子与TEOS的摩尔比1∶2、TEOS与氨水的摩尔比1∶3、无水乙醇与蒸馏水的体积比2∶1为最佳反应物配比。

关 键 词:磁性材料  Fe3O4/CoO/SiO2复合粒子  核壳结构纳米粒子

SYNTHESIS AND CHARACTERIZATION OF MONODISPERSE Fe3O4/CoO/SiO2 CORE/SHELL NANOPARTICLES
Sun Li,Liu Futian,Jiang Qinghui,Sun Xuejiao,Chen Xiuxiu.SYNTHESIS AND CHARACTERIZATION OF MONODISPERSE Fe3O4/CoO/SiO2 CORE/SHELL NANOPARTICLES[J].China Ceramic Industry,2010,17(6):1-5.
Authors:Sun Li  Liu Futian  Jiang Qinghui  Sun Xuejiao  Chen Xiuxiu
Affiliation:Sun Li Liu Futian Jiang Qinghui Sun Xuejiao Chen Xiuxiu(School of Material Science and Engineering,University of Jinan,Jinan,Shandong 250022)
Abstract:Fe3O4/CoOCore/shell type nanoparticles were synthesized by a solvethermal method with the surfactant(PVP) at 160℃,then Fe3O4/CoO/SiO2 composite nanoparticles are prepared by a Stber method in which ammonia is a catalyst.We also studied the influencing factors of the reaction such as mixture ratios,ammonia concentration,and alcohol-water ratio.The particles were characterized by using various experimental techniques such as transmission electron microscopy(TEM),X-ray diffraction(XRD),Alternating gradient force magnetometer(AGM) and Differential thermal analyzer(DTA).The grain size of Fe3O4 /CoO/SiO2 nanoparticles is about 20nm in diameter.The surface modification with CoO in nano-Fe3O4 particles increases the saturation magnetization,and Further surface modification with SiO2 can improve the dispersion and stability of nanoparticles.The best ratio of reactants in the materials reaction is following:the molar ratio of Fe3O4 /CoO with TEOS composite particles is 1:2,the amount of ammonia is 3ml,the volume ratio of ethanol with distilled water is 2:1.
Keywords:magnetic materials  Fe3O4/CoO/SiO2 composite particles  core/shell nanoparticles  
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