Regensburg 2022 – scientific programme
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MM: Fachverband Metall- und Materialphysik
MM 18: Poster Session 2
MM 18.31: Poster
Tuesday, September 6, 2022, 17:30–20:00, P2
Self-detachment and sub-surface densification of dealloyed nanoporous thin films — •Gideon Henkelmann1, Diana Waldow1, Maowen Liu1, Lukas Lührs1, and Jörg Weißmüller1,2 — 1Institute of Materials Physics and Technology, Hamburg University of Technology, Hamburg, Germany — 2Institute of Materials Research, Materials Mechanics, Helmholtz-Zentrum Geesthacht, Geesthacht, Germany
This work highlights experimental observations showing microstructural gradients at interfaces in nanoporous gold, and it explains those observations as a consequence of gradients in a laterally averaged mean curvature of the pore surfaces. Nanoporous gold can be covered by a densified layer at its external surfaces. Furthermore, as we report, thin films of the material often spontaneously detach from massive gold base layers that are intended to enhance adhesion to the substrate. Those phenomena appear intrinsic to the material, as they are naturally reproduced by our kinetic Monte Carlo (KMC) simulation of dealloying and of the subsequent microstructure evolution. Our results suggest that spontaneous densification or decohesion at interfaces may be generic features of nanoscale porous network materials that evolve by curvature-driven surface diffusion.