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MM: Fachverband Metall- und Materialphysik
MM 27: Topical Session: Interface-dominated phenomena - Nanoporous Metals
MM 27.5: Vortrag
Dienstag, 17. März 2020, 15:15–15:30, IFW A
Nanoporous gold with controlled surface morphology — •Stefan Berger1, Lingzhi Liu1,2, Jürgen Markmann3,1, and Jörg Weißmüller1,3 — 1Institut für Werkstoffforschung, Werkstoffmechanik, Helmholtz-Zentrum Geesthacht — 2Chinese Academy of Sciences, Institute of Metal Research, Shenyang National Laboratory for Materials Science — 3Institut für Werkstoffphysik und Werkstofftechnologie, Technische Universität Hamburg
Nanoporous gold is a nanostructured material with a high specific surface area. The large surface of the nano sized gold structures make the material interesting for applications like catalysis and sensing. Investigations of the catalytic behaviour of gold have shown surface dynamics and surface reconstructions. Based on these findings, we present a method to control the surface morphology by annealing in different gaseous environments. Surface morphology investigations by electron microscopy are presented to classify different faceting behaviour. We show that oxygen is a strong driver for faceting and that high index surfaces appear on gold nano ligaments, when treated in oxygen containing environments. A Oxygen free reducing environment in carbon monoxide in contrast will produce more roughed surfaces with only low index facets. A controlled surface morphology might help to further tune the surface properties, which have a great impact on the bulk properties of nanoporous materials.