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MM: Fachverband Metall- und Materialphysik
MM 8: Interface Controlled Properties, Nanomaterials and Microstructure Design II
MM 8.2: Talk
Monday, March 18, 2024, 12:00–12:15, C 230
In-situ studies on the formation of nanoporous copper during electrochemical dealloying — •Samuel Graf1, Eva-Maria Steyskal1, Elisabeth Hengge2, Tatiana Kormilina3, and Roland Würschum1 — 1Institute of Materials Physics, NAWI Graz, Graz University of Technology, Austria — 2Insitute of Biotechnology and Biochemical Engineering, NAWI Graz, Graz University of Technology, Austria — 3Austrian Centre of Electron Microscopy and Nanoanalysis, Steyrergasse 17, 8010 Graz, Austria
Nanoporous metals formed by dealloying, a selective etching process which removes the less noble component(s) from an alloy, are versatile systems due to their self-similar, free-standing, conductive structure with very high surface-to-volume ratio. The here presented bulk nanoporous copper (np-Cu), produced from Mn-Cu [1] and Al-Cu alloys, represents a highly interesting alternative to the well-known nanoporous gold structure, both from an economic as well as a sustainability persperspective. Insights to the formation process of np-Cu are provided by in-situ resistometry during the electrochemical dealloying process, and supported by ex-situ scanning electron microscopy imaging after dealloying. The results show that compared to more noble metals, the surface reordering during nanoporous structure formation is suppressed on np-Cu. This is assigned to the stronger formation of oxides, which yields interesting properties for possible future applications. Financial support by the FWF project P 36409 is appreciated. [1] Hengge et al. Nanoscale Advances 5 (2023) 393-404
Keywords: Nanoporous copper; Electrochemical dealloying; In-situ; Resistometry; Oxide formation