Journal of Powder Materials (한국분말재료학회지)

The Korean Powder Metallurgy & Materials Institute (한국분말재료학회 (*구 분말야금학회))
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Effect of Carrier Gas on the Microstructure and Magnetic Properties of Co Nanoparticles Synthesized by Chemical Vapor Condensation

화학기상응축공정(Chemical Vapor Condensation)으로 제조된 Co 나노분말의 미세구조 및 자기적 성질에 미치는 운송기체의 영향

  • ;
  • X. L. Dong ;
  • ;
  • ;
  • 최철진 (한국기계연구원 재료연구부) ;
  • ;
  • 유지훈 (한국기계연구원 재료연구부) ;
  • 김진천 (한국기계연구원 재료연구부) ;
  • 김병기 (한국기계연구원 재료연구부)
  • Published : 2004.02.01
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Abstract

The nano-sized Co particles were successfully synthesized by chemical vapor condensation (CVC) process using the precursor of cobalt carbonyl ($Co_2(CO)_8$). The influence of carrier gases on the microstructure and magnetic properties of nanoparticles was investigated by means of XRD, TEM, XPS and VSM. The Co nano-particles with different phases and shapes were synthesized with a change of carrier gas : long string morphologies with coexistence of fcc and hcp structure in Ar carrier gas condition; finer Co core in a mass of cobalt oxide with only fcc structure in He; rod type cobalt oxide phase in Ar＋6vol％$O_2$. The saturation magnetization and coercivity was lower in Co nanoparticles synthesized in He carrier gas, due to their finer size.

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