Synthesis and magnetic properties of carbon-coated Ni/SiO2 core/shell nanocomposites

Nujiang Tang*, Liya Lü, Wei Zhong, Chak Tong AU, Youwei Du

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)

Abstract

A simple method for the synthesis of carbon-coated Ni/SiO2 core/shell nanocomposites is reported. The Ni nanoparticles were coated with silica layers via a combined procedure of sol-gel fabrication and hydrogen reduction prior to carbon coating via acetylene decomposition at an appropriate temperature. It was found that the anti-acid ability of the Ni/SiO2 composites was greatly enhanced after carbon coating. The results of magnetization measurement show that the real part (μ′) of complex permeability of the as-obtained sample is almost independent of frequency, and the imaginary part (μ″) stays small up to a frequency of 1 GHz. The encapsulation of Ni particles with SiO2 results in the rise of Ni nanoparticles resistivity. The outcome is the reduction in effect of eddy current at high frequency, making the real part μ′ almost constant and the imaginary part μ″ very small. Thus, this simple method may be effective for preparing composites of soft magnetic properties, especially in the high-frequency range.

Original languageEnglish
Pages (from-to)31-34
Number of pages4
JournalScience China: Physics, Mechanics and Astronomy
Volume52
Issue number1
DOIs
Publication statusPublished - Jan 2009

Scopus Subject Areas

  • Physics and Astronomy(all)

User-Defined Keywords

  • Carbon
  • Core/shell structure
  • Magnetic properties
  • Nanocomposites
  • Nickel
  • Soft magnetic properties
  • Stability

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