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Grain boundary mediated hydriding phase transformations in individual polycrystalline metal nanoparticles

Svetlana Alekseeva (Institutionen för fysik, Kemisk fysik (Chalmers)) ; A. B. D. Fanta ; Beniamino Iandolo ; Tomasz Antosiewicz (Institutionen för fysik, Bionanofotonik (Chalmers)) ; Ferry A. A. Nugroho (Institutionen för fysik, Kemisk fysik (Chalmers)) ; J. B. Wagner ; A. Burrows ; Vladimir P. Zhdanov (Institutionen för fysik, Kemisk fysik (Chalmers)) ; Christoph Langhammer (Institutionen för fysik, Kemisk fysik (Chalmers))
Nature Communications (2041-1723). Vol. 8 (2017),
[Artikel, refereegranskad vetenskaplig]

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.



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Denna post skapades 2017-11-16. Senast ändrad 2017-11-16.
CPL Pubid: 253184

 

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