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MM: Fachverband Metall- und Materialphysik

MM 8: Interface Controlled Properties, Nanomaterials and Microstructure Design II

MM 8.5: Talk

Monday, March 18, 2024, 12:45–13:00, C 230

Mitigation strategies for self-detachment of nanoporous thin films — •Gideon Henkelmann¹, Xinyan Wu^1,2, and Jörg Weissmüller^1,3 — ¹Institute of Materials Physics and Technology, Hamburg University of Technology, Germany — ²Institute of Optical and Electronic Materials, Hamburg University of Technology, Germany — ³Institute of Materials Research, Materials Mechanics, Helmholtz-Zentrum Geesthacht, Germany

Experiment shows thin films of dealloyed nanoporous gold (NPG) spontaneously detaching from massive gold base layers. NPG can also densify near its external surface. This is naturally reproduced by kinetic Monte Carlo (KMC) simulations of dealloying and coarsening and so appears generic for nanoscale network materials evolving by surface diffusion. This talk focuses on how the KMC simulation manages to predict intricate physical phenomena with few and simple assumptions to the kinetics. Finally, we provide strategies to mitigate the self-detachment effect supported by both simulation and experimental results.

Keywords: thin films; dealloying; surface diffusion; nanoporous metals