SKM 2021 – wissenschaftliches Programm
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MM: Fachverband Metall- und Materialphysik
MM 5: Topical Session Interface Dominated Phenomena - Poster
MM 5.12: Poster
Dienstag, 28. September 2021, 10:00–12:45, P
Influence of oxygen on the development of facets on the ligaments of nanoporous gold — •Ulrike Dette1, Stefan A. Berger1, Ling-Zhi Liu2, Jürgen Markmann1,3, and Jörg Weissmüller3,1 — 1Institut für Werkstoffmechanik, Helmholtz-Zentrum Hereon — 2Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences — 3Institut für Werkstoffphysik und Werkstofftechnologie, Technische Universität Hamburg
Even at comparably low temperatures, gold atoms diffuse on the surface of ligaments in nanoporous gold and create facets. Defects and residual silver act as pinning points for the diffusion and thus the facets. For a better understanding of the faceting mechanism and the role of oxygen in it, we annealed nanoporous gold in argon atmosphere at 500°C for 3 h with different oxygen partial pressures controlled by an electrolyzer. We used samples with and without residual silver on the surface. The results show that the higher the oxygen level the stronger the faceting and bigger the ligament size. Therefore, oxygen does support the faceting of nanoporous gold and the coarsening of the ligaments during annealing. We additionally found that the more residual silver on the surface the more silver clusters are formed during annealing and the smaller the facets become. It confirms that residual silver does act as a pinning point for the facets.