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Shape control of size-selected naked platinum nanocrystals

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Author(s)

  • Yu Xia
  • Diana Nelli
  • Riccardo Ferrando
  • Jun Yuan
  • Z Y Li

Department/unit(s)

Publication details

JournalNature Communications
DateAccepted/In press - 7 Apr 2021
DatePublished (current) - 21 May 2021
Issue number1
Volume12
Pages (from-to)3019
Original languageEnglish

Abstract

Controlled growth of far-from-equilibrium-shaped nanoparticles with size selection is essential for the exploration of their unique physical and chemical properties. Shape control by wet-chemistry preparation methods produces surfactant-covered surfaces with limited understanding due to the complexity of the processes involved. Here, we report the controlled production and transformation of octahedra to tetrahedra of size-selected platinum nanocrystals with clean surfaces in an inert gas environment. Molecular dynamics simulations of the growth reveal the key symmetry-breaking atomic mechanism for this autocatalytic shape transformation, confirming the experimental conditions required. In-situ heating experiments demonstrate the relative stability of both octahedral and tetrahedral Pt nanocrystals at least up to 700 °C and that the extended surface diffusion at higher temperature transforms the nanocrystals into equilibrium shape.

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© 2021, The Author(s).

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