物理化学学报 >> 2009, Vol. 25 >> Issue (10): 2167-2172.doi: 10.3866/PKU.WHXB20091014

研究论文 上一篇    下一篇

反相微乳液助水热法可控合成FeNi3合金纳米结构

王润涵, 姜继森, 胡鸣   

  1. 华东师范大学物理系, 纳米功能材料与器件应用研究中心, 上海 200062
  • 收稿日期:2009-05-12 修回日期:2009-07-22 发布日期:2009-09-29
  • 通讯作者: 姜继森 E-mail:jsjiang@phy.ecnu.edu.cn

Controlled Syntheses of FeNi3 Alloy Nanostructures via Reverse Microemulsion-Directed Hydrothermal Motheds

WANG Run-Han, JIANG Ji-Sen, HU Ming   

  1. Center of Functional Nanomaterials and Devices, Department of Physics, East China Normal University, Shanghai 200062, P. R. China
  • Received:2009-05-12 Revised:2009-07-22 Published:2009-09-29
  • Contact: JIANG Ji-Sen E-mail:jsjiang@phy.ecnu.edu.cn

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摘要：

利用水热法处理表面活性剂/正辛烷/正己醇/水四元微乳体系成功合成FeNi3合金纳米结构. 通过改变表面活性剂的用量和类型来调控产物粒径与形貌. 当表面活性剂为聚乙二醇4000(PEG4000)时, 产物为球状, 粒径约为75 nm. 当表面活性剂为十六烷基三甲基溴化铵(CTAB)时, 产物为海胆状.单个海胆状颗粒是由许多纳米棒构成, 其直径约为42 nm, 长度为0.4-1.2 μm. 利用X射线粉末衍射(XRD), 穆斯堡尔谱, 扫描电子显微镜(SEM), 透射电子显微镜(TEM), 选区电子衍射(SAED), 多功能磁天平(MMVFTB)等测试手段对产物的组成、形貌和磁性能进行了表征. 球状和海胆状的FeNi3样品在室温下呈现典型的铁磁性特征, 其饱和磁化强度(Ms)值分别为114.4和97.4 emu·g-1, 矫顽力(Hc)值分别为94.0和329.0 Oe.

关键词: 纳米颗粒, FeNi3合金, 反相微乳液, 水热法, 形貌控制

Abstract:

FeNi3 alloy nanostructures were synthesized by hydrothermal methods in the surfactant/n-octane/n-hexanol/water quaternary reverse microemulsion systems. The size and shape of the products could be controlled by changing the type and dosage of the surfactant. Spherical particles with a diameter of ca 75 nmwere prepared when polyethylene glycol 4000 (PEG4000) was used as the surfactant. Sea-urchin-like particle was obtained when cetyltrimethylammonium bromide (CTAB) was used as the surfactant. The single sea-urchin-like particles were composed of many nanorods with diameters of ca 42 nm and lengths of 0.4-1.2 μm. The as-synthesized products were characterized by powder X-ray diffraction (XRD), Mossbauer spectroscopy, scanning electronic microscopy (SEM), transmission electron microscopy (TEM), selected area electron diffraction (SAED), and multi-purpose magnetic variable field translation balance (MM VFTB). Both the spherical and sea-urchin-like FeNi3 samples exhibited typical ferromagnetic behavior at roomtemperature. Their saturation magnetization values (Ms) were 114.4 and 97.4 emu·g-1, respectively, while their coercivity values (Hc) were 94.0 and 329.0 Oe, respectively.

Key words: Nanoparticles, FeNi3 alloy, Reverse microemulsion, Hydrothermal method, Morphology control