期刊
JOURNAL OF SOLID STATE CHEMISTRY
卷 180, 期 11, 页码 3218-3223出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jssc.2007.08.018
关键词
Carbon nanotubes; Coating; Chemical treatment; Magnetic properties; Mossbauer spectroscopy
资金
- National Natural Science Foundation of China [50473002]
- Shanghai Nanotechnology Special Project [0359nm208]
- Shenzhen University Project [4CHQ]
- Ministry of Education of China [704021]
Novel magnetic composites (Ni0.5Zn0.5Fe2O4-MWCNTs) of multi-walled carbon nanotubes (MWCNTs) coated with Ni0.5Zn0.5Fe2O4 nanocrystals were synthesized by chemical precipitation-hydrothermal process. The composites were characterized by X-ray powder diffractometer (XRD), X-ray photoelectron spectrometer (XPS), Fourier transform infrared spectroscopy (FTIR), Mossbauer spectroscopy (MS), transmission electron microscopy (TEM), and selected area electron diffraction (SAED), etc. A temperature of about 200 degrees C was identified to be an appropriate hydrothermal condition to obtain Ni0.5Zn0.5Fe2O4-MWCNTs, being lower than the synthesis temperature of a single-phase Ni0.5Zn0.5Fe2O4 nanocrystals. The sizes of Ni0.5Zn0.5Fe2O4 in the composites were smaller than those of Ni0.5Zn0.5Fe2O4 nanocrystals in single phase. The composites exhibited more superparamagnetic than Ni0.5Zn0.5Fe2O4 nanocrystals in their relaxation behaviors. The magnetic properties measured by a vibrating sample magnetometer showed that the composites had a high coercive field of 386.0 Oe at room temperature, higher than those of MWCNT and Ni0.5Zn0.5Fe2O4 nanocrystals. (C) 2007 Elsevier Inc. All rights reserved.
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