Influences of different synthesis conditions on properties of Fe3O4 nanoparticles
Influences of different synthesis conditions on properties of Fe3O4 nanoparticles
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DOI：
10.1016/j.matchemphys.2008.06.036
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发表时间：
2009-01-15
影响因子：
4.6
通讯作者：
Shen, Yue
中科院分区：
文献类型：
--
作者：
Yan, Hao;Zhang, Jiancheng;Shen, Yue
以双(2-乙基己基)琥珀酸磺酸钠(AOT)为表面活性剂，以水合肼(N2H4中心圆点H2O)为还原剂，通过水热反应制备了磁性纳米Fe3O4。考察了不同浓度的ACT和N2H4中心点H2O对纳米粒子的影响，并对不同的反应温度和时间进行了分析。用X射线粉末衍射仪(XRD)、高分辨电子显微镜(HRTEM)、选区电子衍射仪(SAED)、能谱仪(EDS)和傅立叶变换红外光谱(FT-IR)对其结构和形貌进行了表征。利用振动样品磁强计(VSM)对产物的磁性能进行了研究。用德拜-谢雷尔方程计算了样品的微晶尺寸。结果表明，在合成过程中用表面活性剂对制备的纳米粒子进行了表面修饰。AOT和N_2H_4中心点H_2O的用量、反应温度和反应时间对粒子的大小、分散性和磁性都有影响。当ACT和N2H4中心点H2O的浓度分别为0.10M和20%(v/v)时，在150℃下反应10h，可以制备出分散良好、尺寸分布较好的磁性Fe3O4纳米粒子。此外，还对可能的作用机制进行了讨论。皇冠版权所有(C)2008由爱思唯尔出版。保留所有权利。
Magnetic nanoparticles of Fe3O4 had been fabricated through hydrothermal reaction by using sodium bis(2-ethylhexyl) sulfosuccinate (AOT) as a surfactant and hydrazine hydrate (N2H4 center dot H2O) as a reductant. The influences of different concentrations of ACT and N2H4 center dot H2O on the nanoparticles were investigated; moreover, the different reaction temperatures and time were also analyzed. Their structure and morphology were characterized by X-ray powder diffraction (XRD), high-resolution transmission electron microscopy (HRTEM), selected area electron diffraction (SAED), energy dispersive spectrometer (EDS) and Fourier transform infrared spectroscopy (FT-IR). Furthermore, magnetic properties of the products were studied by vibrating sample magnetometer (VSM). The crystallite size of the samples was calculated using Debye-Scherrer equation. It was found that the as-prepared nanoparticles had been modified by using surfactant during the synthesis process. The amount of AOT and N2H4 center dot H2O, the reaction temperature and time had effects on the size, the dispersal and the magnetic properties of the particles. The well-dispersed magnetic Fe3O4 nanoparticles with better size distribution could be prepared at 150 degrees C for 10 h when the concentrations of ACT and N2H4 center dot H2O were 0.10 M and 20% (v/v), respectively. Besides, possible mechanisms related to the effects were also discussed. Crown Copyright (C) 2008 Published by Elsevier B.V. All rights reserved.