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HAADF study of Au-Pt core-shell bimetallic nanoparticles

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Abstract

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 (≈Z2). 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.

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Authors and Affiliations

  1. The Texas Materials Institute, University of Texas at Austin, 1 University Station C2201, Building ETC, Room 8.102, 78712-1063, TX, USA

    D. Garcia-Gutierrez, C. Gutierrez-Wing, M. Miki-Yoshida & M. Jose-Yacaman

  2. Instituto Nacional de Investigaciones Nucleares, Carr. Mex.-Tol. Km 36.5, Ocoyoacac, Edo. de Mexico, 52045, Mexico

    C. Gutierrez-Wing

  3. Centro de Investigacion en Materiales Avanzados, Miguel de Cervantes 120 Chihuahua, Chihuahua, C.P. 31109, Mexico

    M. Miki-Yoshida

  4. Center for Nano- and Molecular Science and Technology, The University of Texas at Austin, Welch Hall, Room 3.202 – MC A5300, Austin, TX, 78712, USA

    M. Miki-Yoshida & M. Jose-Yacaman

  5. Department of Chemical Engineering, The University of Texas at Austin, 1 University Station C0400, Austin, TX, 78712-1062, USA

    M. Jose-Yacaman

Authors
  1. D. Garcia-Gutierrez
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  2. C. Gutierrez-Wing
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  3. M. Miki-Yoshida
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  4. M. Jose-Yacaman
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Correspondence to M. Jose-Yacaman.

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PACS

81.07.-b; 61.46+w; 68.37.Lp

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Garcia-Gutierrez, D., Gutierrez-Wing, C., Miki-Yoshida, M. et al. HAADF study of Au-Pt core-shell bimetallic nanoparticles. Appl. Phys. A 79, 481–487 (2004). https://doi.org/10.1007/s00339-004-2600-7

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  • DOI: https://doi.org/10.1007/s00339-004-2600-7

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