Journal of Powder Materials (한국분말재료학회지)

The Korean Powder Metallurgy & Materials Institute (한국분말재료학회 (*구 분말야금학회))
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Fabrication and Characterization of Carbon-Coated Cu Nanopowders by Pulsed Wire Evaporation Method

전기선폭발법에 의해 카본 코팅된 Cu 나노분말의 제조 및 특성 연구

  • Lee, H.M. (Nuclear Materials Research Division, Korea Atomic Energy Research Institute) ;
  • Park, J.H. (Nuclear Materials Research Division, Korea Atomic Energy Research Institute) ;
  • Hong, S.M. (Nuclear Materials Research Division, Korea Atomic Energy Research Institute) ;
  • Uhm, Y.R. (Nuclear Materials Research Division, Korea Atomic Energy Research Institute) ;
  • Rhee, C.K. (Nuclear Materials Research Division, Korea Atomic Energy Research Institute)
  • 이희민 (한국원자력연구원 원자력재료연구부) ;
  • 박중학 (한국원자력연구원 원자력재료연구부) ;
  • 홍성모 (한국원자력연구원 원자력재료연구부) ;
  • 엄영랑 (한국원자력연구원 원자력재료연구부) ;
  • 이창규 (한국원자력연구원 원자력재료연구부)
  • Published : 2009.08.28
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Abstract

Carbon-coated Cu nanopowders with core/shell structure have been successfully fabricated by pulsed wire evaporation (PWE) method, in which a mixed gas of Ar/$CH_4$ (10 vol.%) was used as an ambient gas. The characterization of the samples was carried out using x-ray diffraction (XRD), scanning electron microscope (SEM), and high resolution transmission electron microscope (HRTEM). It was found that the nanoparticles show a spherical morphology with the size ranging of 10-40 nm and are covered with graphite layers of 2-4 nm. When oxygen-passivated Cu nanopowders were annealed under flowing argon gas (600 and 800$^{\circ}C$), the crystallinity of $Cu_2O$ phase and the particle size gradually increased. On the other hand, carbon-coated Cu nanopowders remained similar to as-prepared case with no additional oxide or carbide phases even after the annealing, indicating that the metal nanoparticles are well protected by the carbon-coating layers.

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References

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