Fabrication and Characterization of Carbon-Coated Cu Nanopowders by Pulsed Wire Evaporation Method

H.M. Lee; J.H. Park; S.M. Hong; Y.R. Uhm; C.K. Rhee

doi:10.4150/KPMI.2009.16.4.243

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전기선폭발법에 의해 카본 코팅된 Cu 나노분말의 제조 및 특성 연구: 이희민, 박중학, 홍성모, 엄영랑, 이창규
Fabrication and Characterization of Carbon-Coated Cu Nanopowders by Pulsed Wire Evaporation Method: H.M. Lee, J.H. Park, S.M. Hong, Y.R. Uhm, C.K. Rhee; Journal of Korean Powder Metallurgy Institute 2009;16(4):243-248
DOI: https://doi.org/10.4150/KPMI.2009.16.4.243

¹한국원자력연구원 원자력재료연구부
²한국원자력연구원 원자력재료연구부
³한국원자력연구원 원자력재료연구부
⁴한국원자력연구원 원자력재료연구부
⁵한국원자력연구원 원자력재료연구부
¹Nuclear Materials Research Division, Korea Atomic Energy Research Institute
²Nuclear Materials Research Division, Korea Atomic Energy Research Institute
³Nuclear Materials Research Division, Korea Atomic Energy Research Institute
⁴Nuclear Materials Research Division, Korea Atomic Energy Research Institute
⁵Nuclear Materials Research Division, Korea Atomic Energy Research Institute

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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°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.

Keywords: Pulsed wire evaporation;Carbon-coating;Oxygen-passivation;Cu nanopowder;

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