| CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES |
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Controllable Synthesis and Magnetic Properties of Monodisperse Fe$_{3}$O$_{4}$ Nanoparticles |
| Zhu-Liang Wang, Hui Ma, Fang Wang**, Min Li, Li-Guo Zhang, Xiao-Hong Xu** |
Key Laboratory of Magnetic Molecules and Magnetic Information Material (Ministry of Education), School of Chemistry and Materials Science, Shanxi Normal University, Linfen 041004
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| Cite this article: |
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Zhu-Liang Wang, Hui Ma, Fang Wang et al 2016 Chin. Phys. Lett. 33 107501 |
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Abstract Magnetite (Fe$_{3}$O$_{4}$) nanoparticles with different sizes and shapes are synthesized by the thermal decomposition method. Two approaches, non-injection one-pot and hot-injection methods, are designed to investigate the growth mechanism in detail. It is found that the size and shape of nanoparticles are determined by adjusting the precursor concentration and duration time, which can be well explained by the mechanism based on the LaMer model in our synthetic system. The monodisperse Fe$_{3}$O$_{4}$ nanoparticles have a mean diameter from 5 nm to 16 nm, and shape evolution from spherical to triangular and cubic. The magnetic properties are size-dependent, and Fe$_{3}$O$_{4}$ nanoparticles in small size about 5 nm exhibit superparamagnetic properties at room temperature and maximum saturation magnetization approaches to 78 emu/g, whereas Fe$_{3}$O$_{4}$ nanoparticles develop ferromagnetic properties when the diameter increases to about 16 nm.
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Received: 02 June 2016
Published: 27 October 2016
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| PACS: |
75.47.Lx
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(Magnetic oxides)
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81.07.-b
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(Nanoscale materials and structures: fabrication and characterization)
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81.10.Dn
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(Growth from solutions)
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81.16.Be
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(Chemical synthesis methods)
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| Fund: Supported by the National Natural Science Foundation of China under Grant Nos 51571135, 11274214 and 61434002, the Special Funds of Shanxi Scholars Program under Grant No IRT1156, Collaborative Innovation Center for Shanxi Advanced Permanent Materials and Technology, and the Special Funds of the Ministry of Education of China under Grant No 20121404130001. |
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