Grain boundary mediated hydriding phase transformations in individual polycrystalline metal nanoparticles
Journal article, 2017

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.


Svetlana Alekseeva

Chalmers, Physics, Chemical Physics

A. B. D. Fanta

Technical University of Denmark (DTU)

Beniamino Iandolo

Technical University of Denmark (DTU)

Tomasz Antosiewicz

Chalmers, Physics, Bionanophotonics

Ferry Nugroho

Chalmers, Physics, Chemical Physics

Jakob B. Wagner

Technical University of Denmark (DTU)

A. Burrows

Technical University of Denmark (DTU)

Vladimir Zhdanov

Chalmers, Physics, Chemical Physics

Christoph Langhammer

Chalmers, Physics, Chemical Physics

Nature Communications

2041-1723 (ISSN) 20411723 (eISSN)

Vol. 8 1 1084

Areas of Advance

Nanoscience and Nanotechnology

Subject Categories

Condensed Matter Physics





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