Grain boundary mediated hydriding phase transformations in individual polycrystalline metal nanoparticles

Svetlana Alekseeva, Alice Bastos da Silva Fanta, Beniamino Iandolo, Tomasz J. Antosiewicz, Ferry Anggoro Ardy Nugroho, Jakob B. Wagner, Andrew Burrows, Vladimir P. Zhdanov and Christoph Langhammer ()
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Svetlana Alekseeva: Chalmers University of Technology
Alice Bastos da Silva Fanta: Technical University of Denmark
Beniamino Iandolo: Technical University of Denmark
Tomasz J. Antosiewicz: Chalmers University of Technology
Ferry Anggoro Ardy Nugroho: Chalmers University of Technology
Jakob B. Wagner: Technical University of Denmark
Andrew Burrows: Technical University of Denmark
Vladimir P. Zhdanov: Chalmers University of Technology
Christoph Langhammer: Chalmers University of Technology

Nature Communications, 2017, vol. 8, issue 1, 1-10

Abstract: Abstract Grain boundaries separate crystallites in solids and influence material properties, as widely documented for bulk materials. In nanomaterials, however, investigations of grain boundaries are very challenging and just beginning. Here, we report the systematic mapping of the role of grain boundaries in the hydrogenation phase transformation in individual Pd nanoparticles. Employing multichannel single-particle plasmonic nanospectroscopy, we observe large variation in particle-specific hydride-formation pressure, which is absent in hydride decomposition. Transmission Kikuchi diffraction suggests direct correlation between length and type of grain boundaries and hydride-formation pressure. This correlation is consistent with tensile lattice strain induced by hydrogen localized near grain boundaries as the dominant factor controlling the phase transition during hydrogen absorption. In contrast, such correlation is absent for hydride decomposition, suggesting a different phase-transition pathway. In a wider context, our experimental setup represents a powerful platform to unravel microstructure–function correlations at the individual-nanoparticle level.

Date: 2017
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DOI: 10.1038/s41467-017-00879-9

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