Nano Archive

Low-Temperature Preparation of Superparamagnetic CoFe2O4 Microspheres with High Saturation Magnetization

Yuan, Hong Lei and Wang, Yong Qiang and Zhou, Shao Min and Liu, Li Sheng and Chen, Xi Liang and Lou, Shi Yun and Yuan, Rui Jian and Hao, Yao Ming and Li, Ning (2010) Low-Temperature Preparation of Superparamagnetic CoFe2O4 Microspheres with High Saturation Magnetization. Nanoscale Research Letters, 5 (11). pp. 1817-1821.

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Abstract

Based on a low-temperature route, monodispersed CoFe2O4 microspheres (MSs) were fabricated through aggregation of primary nanoparticles. The microstructural and magnetic characteristics of the as-prepared MSs were characterized by X-ray diffraction/photoelectron spectroscopy, scanning/transmitting electron microscopy, and vibrating sample magnetometer. The results indicate that the diameters of CoFe2O4 MSs with narrow size distribution can be tuned from over 200 to similar to 330 nm. Magnetic measurements reveal these MSs exhibit superparamagnetic behavior at room temperature with high saturation magnetization. Furthermore, the mechanism of formation of the monodispersed CoFe2O4 MSs was discussed on the basis of time-dependent experiments, in which hydrophilic PVP plays a crucial role.

Item Type:Article
Subjects:Material Science > Nanochemistry
ID Code:9827
Deposited By:CSMNT
Deposited On:14 Jan 2011 07:56
Last Modified:14 Jan 2011 07:56

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