Berlin 2015 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 35: Nanostructures at Surfaces

O 35.15: Poster

Dienstag, 17. März 2015, 18:15–21:00, Poster A

Teaching the growth of nanostructures and Ostwald ripening in a master course chemistry — •Jan Philipp Meyburg and Detlef Diesing — Universität Duisburg-Essen

Growth of nanostructures and processes as ageing and ripening of grown nanostructures are fundamental for the understanding of processes in catalysis, for instance. The authors show a computer experiment based on a kinetic Monte Carlo simulation. The computer experiment describes both phenomena, growth and ripening applied to the homoepitaxial growth of silver on a Ag(111) surface. Using DFT data for the activation energy of diffusion and lateral pair interaction energies the computer experiment simulates the island formation during the nanostructure growth in the regime of low coverages θ ≈ 0.1. If the adsorption processes are switched off, the dendritic to hexagonal shapes of the nanostructures change to larger sphere like structures due to sole surface diffusion as typical for Ostwald ripening. A selection of the first student results is shown. These results are compared with STM experiments [1,2] for growth and ripening on (111) surfaces. [1] E. Cox et al. Phys. Rev. B, 71:115414, 2005 [2] K. Morgenstern et al., Phys. Rev. Lett., 76:2113, 1996.