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In situ observation of coalescence growth of small gold clusters by X-ray diffraction technique

  • K. Koga
  • H. Takeo
Conference paper

Abstract

An in situ observation of coalescence growth among small Au clusters (1–2 nm) have been performed by means of a grazing-incidence X-ray diffraction method. The Au clusters, having predominantly the decahedral multiple-twinned structures, were piled up on a cold Si substrate at 92 K so that the coalescence growth could be avoided. By annealing the sample from 82 K up to 325 K, the broad diffraction pattern was found to be gradually sharpened as the annealing temperature increased. The morphology was observed by scanning electron microscopy, after annealing at 325 K showed lumpy-type networks having a typical lump size of 100 nm, indicating coagulation growth of clusters. However, the corresponding diffraction pattern could not be explained without the multiple-twinning relation of small grains; this suggests that the initial cluster structure strongly influences the growth of macroscopic cluster aggregates.

PACS

61.46.+w Clusters Nanoparticles and nanocrystalline materials — 61 10.-i X-ray diffraction and scattering — 61.43.11v Fractals; macroscopic aggregates 

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References

  1. 1.
    J.P. Perez et al.: J. Magn. Magn, Mater. 145, 74 (1995)ADSCrossRefGoogle Scholar
  2. 2.
    P. Melinon et al.: J. Chem. Phys. 107, 10 278 (1997)Google Scholar
  3. 3.
    S. Iwama, T. Sahashi: Jpn. Appi. Phys. 19, 1039 (1980)ADSCrossRefGoogle Scholar
  4. 4.
    J. Harada, K. Ohshima: Surf. Sci, 106, 51 (1981)ADSCrossRefGoogle Scholar
  5. 5.
    K. Koga, H. Takeo: Rev. Sci, Instrum, 67, 4092 (199(5)Google Scholar
  6. 6.
    K. Noga, H. Takec,,, T. Ikeda, K. Ohshima: Phys. Rev. B 57, 4053 (1998)CrossRefGoogle Scholar
  7. 7.
    C.H. Maegillavr-y, G.D. Rieck (Eds.): International Tables for X-ray Crystallography (D. Reidel Publishing Co,, Netherlands 1983) vol. III, p. 237Google Scholar
  8. 8.
    K. Yagi, K. Takayanagi„ K. Kobayashi, C. Honjo: J. Cryst. Growth 28, 117 (197.5)Google Scholar
  9. 9.
    W. Krakow, M. j6se-Yacairialn, J.L. Arag6n: Phys. Rev. B 49, 10 591 (1994)Google Scholar

Copyright information

© Springer-Verlag Italia 1999

Authors and Affiliations

  • K. Koga
    • 1
  • H. Takeo
    • 1
  1. 1.National Institute for Advanced Interdisciplinary ResearchTsukuba, IbarakiJapan

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