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MM: Fachverband Metall- und Materialphysik
MM 12: Postersitzung I
MM 12.42: Poster
Montag, 14. März 2011, 17:30–19:00, P5
Analytical transmission electron microscopy investigations of Sn-Pd nanoparticals with core-shell structures — •Dietrich Haeussler1, Bernhard Schaffer2,3,4, Fu Liu1,5, Ferdinand Hofer4, X. B. Zhang5, and Wolfgang Jaeger1 — 1Microanalysis of Materials, Christian-Albrechts-University Kiel, 24143 Kiel, Germany — 2SuperSTEM Facility, Daresbury Laboratory, Warrington, WA4 4AD, UK — 3SUPA, School of Physics and Astronomy, University of Glasgow, UK — 4Institute for Electron Microscopy, Graz University of Technology, 8010 Graz, Austria — 5Department of Materials Science and Engineering, Zhejiang University, Hangzhou, 310037, China
Metallic core-shell nanoparticles for applications in catalysis and as data storage materials offer the possibility to tailor macroscopic properties generally not obtained by the single-component particles. We show for Pd-Sn nanoparticles that a combination of the analytical techniques of the spectrum-imaging mode with high-angle annular dark-field imaging in Cs-corrected high-resolution scanning transmission electron microscopy enable to precisely analyse and map structure, morphology, and chemical composition of the particles. Beneficial additional information about the particle structure is obtained from electron nanodiffraction patterns. Our analyses of a number of Sn-Pd particles with diameters as small as 20 nm reveal particles with Pd-rich cores and oxidized shells enriched in Sn as well as polycrystalline alloy particles. The study confirms that these methods are useful for monitoring reactions or degradation for composite nanoparticle materials.