전기선폭발법에 의해 카본 코팅된 Cu 나노분말의 제조 및 특성 연구
Fabrication and Characterization of Carbon-Coated Cu Nanopowders by Pulsed Wire Evaporation Method
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초록
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/CH4 (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 ㎚ and are covered with graphite layers of 2-4 ㎚. When oxygen-passivated Cu nanopowders were annealed under flowing argon gas (600 and 800℃), the crystallinity of Cu2O 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.
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/CH4 (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 ㎚ and are covered with graphite layers of 2-4 ㎚. When oxygen-passivated Cu nanopowders were annealed under flowing argon gas (600 and 800℃), the crystallinity of Cu2O 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.
참고문헌 (18)
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