Controlling Structure and Morphology of CoPt Nanoparticles through Dynamical or Static Coalescence Effects

J. Penuelas, P. Andreazza, C. Andreazza-Vignolle, H. C. N. Tolentino, M. De Santis, and C. Mottet
Phys. Rev. Lett. 100, 115502 – Published 18 March 2008

Abstract

The structure and morphology of 1 to 3 nm size CoPt nanoparticles have been investigated in situ and in real time under different conditions: growth at 500°C or at room temperature (RT) followed by annealing at 500°C. The small-angle x-ray scattering measurements show size and temperature dependent growth mode with particle motions on the surface, while wide-angle scattering results, supported by Monte Carlo simulations, allow structure identification. If icosahedra are systematically detected at the first growth stages at RT, annealing at 500°C yields the decahedral structure from the quasistatic coalescence of icosahedral morphology. Meanwhile, growth at 500°C proceeds by a dynamical coalescence mechanism at the early stage, yielding truncated octahedral cubic structures.

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  • Received 12 November 2007

DOI:https://doi.org/10.1103/PhysRevLett.100.115502

©2008 American Physical Society

Authors & Affiliations

J. Penuelas1, P. Andreazza1,*, C. Andreazza-Vignolle1, H. C. N. Tolentino2, M. De Santis2, and C. Mottet3

  • 1Centre de Recherche sur la Matière Divisée, UMR 6619 Université d’Orléans & CNRS, 1 bis, rue de la Férollerie, 45071 Orléans Cedex, France
  • 2Institut Néel, CNRS & UJF, 25 avenue des Martyrs BP 166, 38042 Grenoble Cedex 9, France
  • 3Centre de Recherche en Matière Condensée et Nanosciences-CNRS, Campus de Luminy, case 913, 13288 Marseille Cedex 9, France

  • *Corresponding author. Pascal.Andreazza@univ-orleans.fr

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Issue

Vol. 100, Iss. 11 — 21 March 2008

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