Low-Temperature Preparation of Superparamagnetic CoFe<sub>2</sub>O<sub>4</sub> Microspheres with High Saturation Magnetization
<p>Abstract</p> <p>Based on a low-temperature route, monodispersed CoFe<sub>2</sub>O<sub>4</sub> microspheres (MSs) were fabricated through aggregation of primary nanoparticles. The microstructural and magnetic characteristics of the as-prepared MSs were cha...
| Main Authors: | , , , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
SpringerOpen
2010-01-01
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| Series: | Nanoscale Research Letters |
| Subjects: | |
| Online Access: | http://dx.doi.org/10.1007/s11671-010-9718-7 |
| Summary: | <p>Abstract</p> <p>Based on a low-temperature route, monodispersed CoFe<sub>2</sub>O<sub>4</sub> 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 CoFe<sub>2</sub>O<sub>4</sub> MSs with narrow size distribution can be tuned from over 200 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 CoFe<sub>2</sub>O<sub>4</sub> MSs was discussed on the basis of time-dependent experiments, in which hydrophilic PVP plays a crucial role.</p> |
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| ISSN: | 1931-7573 1556-276X |