A highly coercive carbon nanotube coated with Ni0.5Zn0.5Fe2O4 nanocrystals synthesized by chemical precipitation-hydrothermal process

被引：41

作者：

Cao, Huiqun ^{[2
]}

Zhu, Meifang ^{[1
]}

Li, Yaogang ^{[1
]}

Liu, Jianhong ^{[2
]}

Ni, Zhuo ^{[2
]}

Qin, Zongyi ^{[1
]}

机构：

[1] Donghua Univ, State Key Lab Modificat Chem Fibers & Polymer Mat, Coll Mat Sci & Engn, Shanghai 200051, Peoples R China

[2] Shenzhen Univ, Coll Chem & Chem Engn, Shenzhen 518060, Peoples R China

来源：

JOURNAL OF SOLID STATE CHEMISTRY | 2007年 / 180卷 / 11期

基金：

中国国家自然科学基金;

关键词：

Carbon nanotubes; Coating; Chemical treatment; Magnetic properties; Mossbauer spectroscopy;

D O I：

10.1016/j.jssc.2007.08.018

中图分类号：

O61 [无机化学];

学科分类号：

070301 ; 081704 ;

摘要：

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.

引用

页码：3218 / 3223

页数：6

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