Dresden 2009 – wissenschaftliches Programm

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MM: Fachverband Metall- und Materialphysik

MM 21: Topical Session Nanoporous Functional Materials - Poster

MM 21.2: Poster

Dienstag, 24. März 2009, 14:45–16:30, P4

Metals with tunable properties based on porous nanostructures — •Thomas Traußnig1, Klemens Rumpf2, Petra Granitzer2, Stephan Landgraf3, Heinz Krenn2, and Roland Würschum11Institut für Materialphysik, Technische Universität Graz, Petersgasse 16, A-8010 Graz, Austria — 2Institut für Physik, Karl Franzens Universität Graz, Graz, Austria — 3Institut für Physik. u. Theoret. Chemie, Technische Universität Graz, Graz, Austria

Electric field-induced tuning of material properties is usually restricted to nonmetals such as semiconductors and piezoelectric ceramics. Studies on the property tuning of metals have been initiated recently making use of nanocomposites of porous nanocrystalline metals and liquid electrolytes [1-3]. Owing to the high surface-to-volume ratio of nanoscale metals, voltage-induced formation of electrochemical double layers gives rise to a high fraction of interfacial space-charge regions which results in a reversible change of the overall physical properties of the metal. Studies of the variation of the magnetic behaviour of nanophase metals and alloys upon in-situ charging in a SQUID magnetometer will be presented.

[1] J. Weissmüller et al., Science 300 (2003) 312.

[2] H. Drings et al., Appl. Phys. Lett. 88 (2006) 253103.

[3] M. Sagmeister et al., Phys. Rev. Lett. 96 (2006) 156601

Acknowledgement: Financial support by FWF - Austrian Science Fund (project S10405-N16) is appreciated.

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