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Berlin 2005 – scientific programme

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M: Metallphysik

M 18: Nanoskalige Materialien I

M 18.4: Talk

Saturday, March 5, 2005, 10:00–10:15, TU H111

Charge-Induced Strain of Nanoporous Gold-Platinum Alloys — •Smrutiranjan Parida1, Dominik Kramer1, and Jörg Weissmüller1,21Forschungszentrum Karlsruhe, Institut für Nanotechnologie, Karlsruhe — 2Universität des Saarlandes, Fachrichtung Technische Physik, Saarbrücken

If porous, nanostructured metals immersed in an electrolyte are charged electrically, volumetric expansion and contraction is induced in phase with the applied potential [1,2], with strain amplitudes comparable to those of commercial piezoceramics [1]. It has been shown that such nanoporous metal/electrolyte actuator materials can be prepared by dealloying [2], the selective dissolution of the less noble components of an alloy. We present in-situ measurements of the charge-induced strain of nanoporous gold-platinum alloys prepared by dealloying of silver-gold-copper-platinum alloys. The observed strain amplitudes increase with increasing platinum content for the composition studied. The maximum strain amplitudes are very large - larger by one order of magnitude compared to nanoporous gold prepared by dealloying Ag75Au25.

[1] J. Weissmüller et al, Science 300 (2003) 312 [2] D. Kramer, R. N. Viswanath, J. Weissmüller, Nano Letters 4 (2004) 793

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