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Synthesis, morphology, and magnetic properties of NiCo/carbon nanocomposites

Published online by Cambridge University Press:  17 November 2011

Meihua Xu ,
Wei Zhong ,
Chaktong Au ,
Liya Lv  and
Youwei Du
Meihua Xu
Affiliation:
Nanjing National Laboratory of Microstructures, Nanjing University, Nanjing 210093, People's Republic of China; Jiangsu Provincial Laboratory for NanoTechnology, Nanjing University, Nanjing 210093, People's Republic of China; and Department of Applied Physics, Nanjing University of Technology, Nanjing 210009, People's Republic of China
Wei Zhong*
Affiliation:
Nanjing National Laboratory of Microstructures, Nanjing University, Nanjing 210093, People's Republic of China; and Jiangsu Provincial Laboratory for NanoTechnology, Nanjing University, Nanjing 210093, People's Republic of China
Chaktong Au
Affiliation:
Chemistry Department, Hong Kong Baptist University, Hong Kong, People’s Republic of China
Liya Lv
Affiliation:
Nanjing National Laboratory of Microstructures, Nanjing University, Nanjing 210093, People's Republic of China; and Jiangsu Provincial Laboratory for NanoTechnology, Nanjing University, Nanjing 210093, People's Republic of China
Youwei Du
Affiliation:
Nanjing National Laboratory of Microstructures, Nanjing University, Nanjing 210093, People's Republic of China; and Jiangsu Provincial Laboratory for NanoTechnology, Nanjing University, Nanjing 210093, People's Republic of China
*
a)Address all correspondence to this author. e-mail: [email protected]
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Abstract

Depending on the Ni:Co molar ratio, composites of NiCo/carbon nanorods and NiCo/carbon nanotubes can be synthesized through catalytic decomposition of benzene at 500 °C over NiCo nanoparticles derived from sol–gel synthesis followed by hydrogen reduction. According to x-ray diffraction results, the average grain size of NiCo31 is 11.2 nm, whereas that of NiCo13 and NiCo22 is 24.9 nm. Field-emission scanning electron microscopic and high-resolution transmission electron microscopic images reveal that over NiCo13 and NiCo22, the carbon nanomaterials are mainly in the form of nanorods, whereas over NiCo31, they are in the form of nanotubes. The composites of carbon and NiCo alloy are highly stable in air and show soft magnetic property and almost equal coercivity. It is observed that the saturation magnetization is affected by the composition of NiCo alloy.

Keywords

CompositeMagnetic propertiesMorphology
Type
Articles
Information
Journal of Materials Research , Volume 26 , Issue 24 , 28 December 2011 , pp. 3058 - 3064
Copyright
Copyright © Materials Research Society 2011

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References

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