Shape control of size-selected naked platinum nanocrystals

Yu Xia, Diana Nelli, Riccardo Ferrando (), Jun Yuan () and Z. Y. Li ()
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Yu Xia: University of Birmingham, Edgbaston
Diana Nelli: Università degli Studi di Genova
Riccardo Ferrando: Università degli Studi di Genova
Jun Yuan: University of York, Heslington
Z. Y. Li: University of Birmingham, Edgbaston

Nature Communications, 2021, vol. 12, issue 1, 1-8

Abstract: 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.

Date: 2021
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DOI: 10.1038/s41467-021-23305-7

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