Preparation of superparamagnetic γ-Fe2O3 nanoparticles in nonaqueous medium by γ-irradiation

被引：24
作者：
Du, JH
Liu, HR [1 ]
机构：
[1] Univ Sci & Technol China, Dept Polymer Sci & Engn, Hefei 230036, Anhui, Peoples R China
[2] Univ Sci & Technol China, Dept Chem, Hefei 230036, Anhui, Peoples R China
来源：
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS | 2006年 / 302卷 / 01期
基金：
中国国家自然科学基金;
关键词：
gamma-Fe2O3; nanoparticles; nonaqueous medium; superparamagnetism; gamma-irradiation;
D O I：
10.1016/j.jmmm.2005.09.016
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Superparamagnetic gamma-Fe2O3 nanocrystallites have been prepared by gamma-irradiating ferrocene in the presence of isopropyl alcohol to get Fe nanoparticles in nitrogen atmosphere and at room temperature, followed by oxidization in air to obtain gamma-Fe2O3. The final black powder was characterized with X-ray powder diffraction (XRD), transmission electron microscope (TEM) and X-ray photoelectron spectroscopy (XPS). From XRD pattern and XPS spectrum, we can confirm to get gamma-Fe2O3. The particle size is several nanometers as shown in TEM image. Magnetic hysteresis loop measurements exhibited that the gamma-Fe2O3 nanoparticles display superparamagnetism. However, a trace black powder was obtained in kerosene oil using the same method. A possible formation mechanism of the gamma-Fe2O3 nanoparticles was suggested. (c) 2005 Elsevier B.V. All rights reserved.
引用
收藏
页码：263 / 266
页数：4
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