Nanoporous metals prepared by alloy corrosion – Tuning of electrical, mechanical and magnetic properties

Markus Gößler, Eva-Maria Steyskal, Heinz Krenn, Lukas Lührs, J. Weissmüller, Roland Würschum

Research output: Contribution to conferenceAbstract

Abstract

Alloy corrosion has proved to be a powerful method to produce a plethora of different nanoporous metals. The underlying mechanism is both simple and effective: An etching agent leaches lesser noble atoms from an alloy, while the diffusivity of the nobler component is enhanced at the solid-electrolyte interface, leading to an agglomeration of noble atoms [1]. Adequate etching parameters, such as the type of electrolyte and the applied potential, ultimately lead to the formation of a nanoporous structure. One advantage of this class of nanoporous materials is the adjustable pore size, which can be controlled via thermal annealing after the production step.
Intrinsic bulk properties of nanoporous metals can be altered via surface modifications, based on the high surface-to-volume ratios of these materials. Such modulations can be an electrostatic charging of the surface or the deposition of a surface layer with a different chemical composition, which are both attainable in an electrochemical cell. Using the nanoporous metal as electrode enables an effective control of surface state.
In our studies the model system of nanoporous palladium was studied regarding its electrical, mechanical and magnetic properties in three innovative in situ measurement setups upon electrochemical treatment: In situ resistometry enabled to monitor changes of electrical resistance (ΔR), in situ dilatometry yielded direct length changes (ΔL) and insights in mechanical properties, while in situ SQUID-magnetometry was conducted to track alterations of magnetic moment (ΔM). A particularly effective tuning of magnetisation is shown for a nanoporous copper-nickel alloy in addition. All three in situ methods allow a direct assignment of property variations (ΔR, ΔL and ΔM) to chemical reactions and charging states [2], which is the basis for a controlled tailoring of material properties on the nanoscale.
References
[1] I. McCue, E. Benn, B. Gaskey, J. Erlebacher, Dealloying and dealloyed materials, Annu. Rev. Mater. Res. 46 (2016) 263-286.
[2] E.-M. Steyskal, S. Topolovec, S. Landgraf, H. Krenn, R. Würschum, In situ monitoring magnetism and resistance of nanophase platinum upon electrochemical oxidation, Beilst. J. Nanotech. 4 (2013) 394-399.
Original languageEnglish
Publication statusPublished - 2018
Event 85th IUVSTA Workshop on Nanoporous Materials for Green Energy Conversion and Storage - Seggau, Austria
Duration: 15 Oct 201819 Oct 2018

Workshop

Workshop 85th IUVSTA Workshop on Nanoporous Materials for Green Energy Conversion and Storage
CountryAustria
CitySeggau
Period15/10/1819/10/18

Fields of Expertise

  • Advanced Materials Science

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