Aggregation of Fractal and Dendritic Ag Clusters on a Pt(111) Surface

We have used variable-temperature scanning tunneling microscopy to study the aggregation of two-dimensional Ag clusters on Pt(111). A transition from randomly ramified to dendritic fractal growth is observed in the diffusion-limited regime. Atomic-scale observations have identified the anisotropy of edge diffusion as microscopic origin of this crossover. Dependent on the deposition flux, this anisotropy is either amplified to the macroscopic-cluster shape and trigonal dendrites result, or it is degenerated and randomly ramified fractals occur. Our study elucidates the close relation between fractal and dendritic pattern formation in diffusion-limited aggregation on a two-dimensional lattice.


Published in:
Applied Physics a-Materials Science & Processing, 60, 2, 167-171
Year:
1995
ISSN:
0721-7250
ISBN:
0721-7250
Keywords:
Laboratories:




 Record created 2009-04-14, last modified 2018-03-17

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