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Synthesis and formation mechanism of hollow carbon spheres encapsulating magnetite nanocrystals

Published online by Cambridge University Press:  31 January 2011

Boyang Liu ,
Dechang Jia ,
Haibo Feng ,
Qingchang Meng  and
Yingfeng Shao
Boyang Liu
Affiliation:
Institute for Advanced Ceramics, Harbin Institute of Technology, Harbin 150001, China
Dechang Jia*
Affiliation:
Institute for Advanced Ceramics, Harbin Institute of Technology, Harbin 150001, China
Haibo Feng
Affiliation:
Institute for Advanced Ceramics, Harbin Institute of Technology, Harbin 150001, China
Qingchang Meng
Affiliation:
Institute for Advanced Ceramics, Harbin Institute of Technology, Harbin 150001, China
Yingfeng Shao
Affiliation:
Institute for Advanced Ceramics, Harbin Institute of Technology, Harbin 150001, China
*
a)Address all correspondence to this author. e-mail: dcjia@hit.edu.cn
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Abstract

Hollow carbon spheres encapsulating magnetite nanocrystals were obtained in high-pressure argon at 600 °C followed by hydrolysis of Fe(NH3)2Cl2 in the hollow interiors at room temperature and heat treatment in argon at 450 °C for 2 h. The structure, morphology, and properties of the products were characterized by x-ray diffraction, field-emission scanning electron microscopy, transmission electron microscopy, thermogravimetric analysis, and vibrating sample magnetometry. The hollow carbon spheres have diameters of 1–10 μm and wall thicknesses of hundreds of nanometers; the wt% of magnetite nanocrystals in them is ∼13.2%. Equiaxed magnetite nanocrystals range in size from 15 to 90 nm, while acicular magnetite nanocrystals have diameters of ∼20 nm and lengths of 120–450 nm. The saturation magnetization value of the hollow carbon spheres encapsulating magnetite nanocrystals is 4.29 emu/g.

Keywords

AnnealingMagneticPowder processing
Type
Articles
Information
Journal of Materials Research , Volume 23 , Issue 7 , July 2008 , pp. 1980 - 1986
Copyright
Copyright © Materials Research Society 2008

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