Fabrication and Properties of Carbon-Encapsulated Cobalt Nanoparticles over NaCl by CVD

Haipeng Li, Yue Li, Yongguang Zhang, Chunyong Liang, Hongshui Wang, Baoe Li, Desmond Adair, Zhumabay Bakenov

Research output: Contribution to journalArticle

15 Citations (Scopus)

Abstract

Carbon-encapsulated cobalt (Co@C) nanoparticles, with a tunable structure, were synthesized by chemical vapor deposition using Co nanoparticles as the catalyst and supported on a water-soluble substrate (sodium chloride), which was easily removed by washing and centrifugation. The influences of growth temperature and time on the structure and magnetic properties of the Co@C nanoparticles were systematically investigated. For different growth temperatures, the magnetic Co nanoparticles were encapsulated by different types of carbon layers, including amorphous carbon layers, graphitic layers, and carbon nanofibers. This inferred a close relationship between the structure of the carbon-encapsulated metal nanoparticles and the growth temperature. At a fixed growth temperature of 400 °C, prolonged growth time caused an increase in thickness of the carbon layers. The magnetic characterization indicated that the magnetic properties of the obtained Co@C nanoparticles depend not only on the graphitization but also on the thickness of the encapsulated carbon layer, which were easily controlled by the growth temperatures and times. Optimization of the synthesis process allowed achieving relatively high coercivity of the synthesized Co@C nanoparticles and enhancement of its ferromagnetic properties, which make this system promising as a magnetic material, particularly for high-density magnetic recording applications.

Original languageEnglish
Article number432
JournalNanoscale Research Letters
Volume11
Issue number1
DOIs
Publication statusPublished - Dec 1 2016

Keywords

  • Carbon-encapsulated metal nanoparticles
  • Chemical vapor deposition
  • Magnetic property
  • Sodium chloride

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics

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