The Analysis and Growth Mechanism of Core/Shell-type Ni/MnO Nanoparticls

Chin J Mater Res

2008, Vol. 22

Issue (3): 241-245 DOI:

Research Articles

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The Analysis and Growth Mechanism of Core/Shell-type Ni/MnO Nanoparticls

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大连理工大学

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;. The Analysis and Growth Mechanism of Core/Shell-type Ni/MnO Nanoparticls. Chin J Mater Res, 2008, 22(3): 241-245.

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Abstract Shell/core-type MnO-coated Ni nanoparticles was prepared by arc discharge method using micron-sized Ni and MnO2 powders as the raw materials, and the evaporating atmosphere was a mixture of hydrogen and argon. The morphology, structure and chemical composition of the as-prepared nanoparticles were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM) and thermal gravity analysis (TGA), respectively. It was showed that most of nanoparticles were in spherical shape in the range of 30-60 nm, with a shell of MnO phase and a core of Ni. The formation of nanoparticals was effectively explained by an extended mechanism of the Vapor-Liquid-Solid (VLS) with the existence of stoichiometric oxygen. The Ni core plays an essential catalyst in the formation of the core/shell structure.

Key words: core/shell structure DC arc plasma method Ni/MnO growth mechanism

Received: 12 June 2007

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