title: Electrochemically Tunable Resistance of Nanoporous Platinum Produced by Dealloying.
abstract: The extremely high surface-to-volume ratio of nanoporous platinum (np-Pt) produced by dealloying was applied for tuning electrical resistance by surface charging. In the as-dealloyed state, a characteristic sign-inversion of the charging-induced resistance variation occurs, which can be associated with the electronic structure of PtO. After electrochemical reduction, the relative resistance variations of np-Pt of up to 58% could be generated by electrochemically induced adsorption and desorption, which was 1 order of magnitude larger compared with that of cluster-assembled nanocrystalline Pt. Although the maximum resistance variation was also higher than that of dealloyed nanoporous gold (np-Au), the resistance variation related to the imposed charge was reduced owing to the higher bulk resistance of Pt compared with that of Au. The sign-inversion behavior of the resistance could be recovered by re-oxidation.
authors.affiliation: Institute of Materials Physics, Graz University of Technology , Petersgasse 16, A-8010 Graz, Austria.
authors.forename: Eva-Maria
authors.initials: EM
authors.lastname: Steyskal
authors.affiliation: Institute of Materials Physics and Technology, Hamburg-Harburg University of Technology , Eißendorfer Straße 42, D-21073 Hamburg, Germany.
authors.forename: Zhen
authors.initials: Z
authors.lastname: Qi
authors.affiliation: Institute of Electron Microscopy and Nanoanalysis, Graz University of Technology , Steyrergasse 17, A-8010 Graz, Austria.
authors.forename: Peter
authors.initials: P
authors.lastname: Pölt
authors.affiliation: Institute of Electron Microscopy and Nanoanalysis, Graz University of Technology , Steyrergasse 17, A-8010 Graz, Austria.
authors.forename: Mihaela
authors.initials: M
authors.lastname: Albu
authors.affiliation: Institute of Materials Physics and Technology, Hamburg-Harburg University of Technology , Eißendorfer Straße 42, D-21073 Hamburg, Germany.|Institute of Materials Research, Helmholtz-Zentrum Geesthacht , Max-Planck-Straße 1, D-21502 Geesthacht, Germany.
authors.forename: Jörg
authors.initials: J
authors.lastname: Weissmüller
authors.affiliation: Institute of Materials Physics, Graz University of Technology , Petersgasse 16, A-8010 Graz, Austria.
authors.forename: Roland
authors.initials: R
authors.lastname: Würschum