Regensburg 2019 – wissenschaftliches Programm
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MM: Fachverband Metall- und Materialphysik
MM 29: Microstructure and Phase Transformations
MM 29.9: Vortrag
Mittwoch, 3. April 2019, 17:15–17:30, H46
Formation and evolution of silver clusters in nanoporous gold: Views from kinetic Monte Carlo simulations — •Bao-Nam Dinh Ngô1, Yong Li2, Jürgen Markmann1,2, and Jörg Weissmüller1,2 — 1Institute of Materials Research, Materials Mechanics, Helmholtz-Zentrum Geesthacht, Geesthacht, Germany — 2Institute of Materials Physics and Technology, Hamburg University of Technology, Hamburg, Germany
Nanoporous gold (NPG) made by dealloying assumes the geometry of an interconnected network of nanoscale ligaments. Thanks to its abundant free surface, the material offers a wide range of potential applications in actuation, catalysis, and sensing. While the fabrication process gives rise to a mostly monolithic network structure, the small remnant of silver content proves to have strong influences on the performance of the material at work. Here, using on-lattice kinetic Monte Carlo simulations, we systematically study the formation and evolution of silver clusters at different stages of dealloying as well as during the subsequent post-dealloying coarsening. We then explore the role of dealloying potentials on the size and number of silver clusters. Finally, we briefly discuss how the environment influences the surface concentration of silver in NPG.