증기급속응축법 제조 귀금속 나노분말의 결정학적 특성 연구

유연태; Yeon-tae Yu

Korean Journal of Materials Research, Vol.13, No.5, 285-291, May, 2003

DOI10.3740/MRSK.2003.13.5.285 Export Citation

증기급속응축법 제조 귀금속 나노분말의 결정학적 특성 연구

Characterization of Crystal Structure for Nanosized Noble Metal Particles Fabricated by ERC(Evaporation and Rapid Condensation) Method

유연태^†

한국지질자원연구원 자원활용연구부

Yeon-tae Yu^†

Minerals and Materials Processing Division, Korea Institute of Geoscience and Mineral Resources, Daejeon 305-350, Korea

E-mail:

The nanosized silver and gold particles are prepared by ERC method in which metal vapors with high temperature is rapidly quenched by coolants such as liquid nitrogen or liquid argon. In order to monitor the crystal structural changes on the internal and the surface of the nanosized noble metal particles, lattice parameter, internal strain and Debye-Waller factor are investigated, and the calculation of X-ray diffraction scattering intensity is performed. The lattice parameters of silver and gold particles agree with those of bulk materials, and crystal internal strain of the metal particles is not changed by rapid cooling. The Debye-Waller factor of gold particles is increased with decreasing particle size because of the surface softening phenomenon of nanosized particles, but the crystal structural change on the surface of the particles is not detected from the comparison the calculated X-ray diffraction profile with the experimental profile on gold particles with the particle size of 4 nm.

Keywords:nanosized particles;crystal structure;evaporation;condensation

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[3] Kato A, Suyama, J. Surf. Sci. Sco. Japan, 8, 20 (1987)

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[6] Cranqvist CG, Buhrman RA, J. Appl. Phys., 47, 2200 (1976)

[7] Mazdiyaski KS, Dolloff RT, Smith JS, J. Am. Ceram. Soc., 52, 523 (1669)

[8] Thomas JR, J. Appl. Phys., 37, 2914 (1966)

[9] Shiosaki T, Kawabata A, Japan J. Appl. Phys., 10, 153 (1971)

[10] Buckle E, Takiropoulos P, Pointion KC, Inter. Metals Rev., 31, 258 (1986)

[11] Ohno T, J. Cryst. Growth, 70, 541 (1984)

[12] Yu YT, Tsu Y, Mater. Trans., 33, 1178 (1992)

[13] Yu YT, Tsu Y, Mater. Trans., 34, 809 (1993)

[14] Cullity BD, Elements of X-ray Diffraction, Addison-Wesley Publishing Co., 350 (1977) (1977)

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[27] International Tables for X-ray Crystallography Vol. IV, 71 (1974) (1974)