HAADF study of Au-Pt core-shell bimetallic nanoparticles

Bimetallic Pt/Au nanoparticles have been synthesized by the polyol method, stabilized by poly (vinylpyrrolidone) (PVP). The structure of the particles has been determined using transmission electron microscopy and a HAADF (High Angle Annular Dark Field) technique. Some particles present a core-shell...

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Bibliographic Details
Published in:Applied physics. A, Materials science & processing Materials science & processing, 2004-08, Vol.79 (3), p.481-487
Main Authors: GARCIA-GUTIERREZ, D, GUTIERREZ-WING, C, MIKI-YOSHIDA, M, JOSE-YACAMAN, M
Format: Article
Language:English
Subjects:
Atomic structure
Bimetals
Chemical synthesis methods
Core-shell structure
Cross-disciplinary physics: materials science
rheology
Exact sciences and technology
Gold
Materials science
Methods of nanofabrication
Nanoparticles
Orientation
Physics
Polyols
Strain
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Summary:Bimetallic Pt/Au nanoparticles have been synthesized by the polyol method, stabilized by poly (vinylpyrrolidone) (PVP). The structure of the particles has been determined using transmission electron microscopy and a HAADF (High Angle Annular Dark Field) technique. Some particles present a core-shell structure, with a contrast not predicted by simple atomic number contrast ({/content/U7E6GF035M0PRCKP/xxlarge8776.gif}Z). Strain fields present in the core-shell interface are thought to be the cause of this contrast, which depends on the orientation of the particle with respect to the electron beam. We propose HAADF as a useful technique to identified core-shell structures in nanoparticle systems.
ISSN:0947-8396
1432-0630
DOI:10.1007/s00339-004-2600-7