Regensburg 2022 – wissenschaftliches Programm
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MM: Fachverband Metall- und Materialphysik
MM 32: Nanomaterials: Surface Effects
MM 32.2: Vortrag
Donnerstag, 8. September 2022, 12:00–12:15, H45
Surfaces of nanoporous gold: rough and faceted? — •Stefan A. Berger1, Ulrike Dette1,2, Lingzhi Liu3, Jürgen Markmann1,2, and Jörg Weissmüller2,1 — 1Helmholtz Zentrum Hereon — 2Technische Universität Hamburg — 3Shenyang National Laboratory for Materials Science
Nanoporous gold is an interesting model system for studying the impact of surfaces on the properties of nanomaterials. The surface morphology, faceted or rough, is of interest in that context. Scanning electron micrographs almost invariably show smoothly curved surfaces at the scale of the ligament size, suggesting roughness as opposed to faceting. Here, we show that proper imaging conditions to reveal facets, suggesting that the roughness may be an artifact of imaging. We find that the roughness is most pronounced after annealing in oxygen atmosphere. While low index facets are expected to prevail on gold, we regularly also observe high index facets.