In situ observation of coalescence growth of small gold clusters by X-ray diffraction technique
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.
PACS61.46.+w Clusters Nanoparticles and nanocrystalline materials — 61 10.-i X-ray diffraction and scattering — 61.43.11v Fractals; macroscopic aggregates
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