期刊
JOURNAL OF MATERIALS SCIENCE
卷 45, 期 13, 页码 3483-3489出版社
SPRINGER
DOI: 10.1007/s10853-010-4378-7
关键词
-
资金
- National Natural Science Foundation of China [50504017]
- Hunan Provincial Key Science and Technology Project of China [2007FJ3008]
Monodisperse Fe3O4 nanoparticles with narrow size distribution could be successfully synthesized in large quantities by a facile solvothermal synthetic method in the presence of oleic acid and oleylamine. Well-defined assembly of uniform nanoparticles with average sizes of 8 nm can be obtained without a further size-selection process. The sizes of final products could be readily tuned from 5 to 12 nm by adjusting the experimental parameters such as reaction time, temperature, and surfactants. The phase structures, morphologies, and magnetic properties of the as-prepared products were investigated in detail by X-ray diffraction, transmission electron microscopy, selected area electron diffraction, high-resolution transmission electron microscopy, and magnetometry with a superconducting quantum interference device. The magnetic study reveals that the as-synthesized nanoparticles are ferromagnetic at 2 K while they are superparamagnetic at 300 K.
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