期刊
NATURE COMMUNICATIONS
卷 8, 期 -, 页码 -出版社
NATURE PUBLISHING GROUP
DOI: 10.1038/s41467-017-00879-9
关键词
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资金
- ERC [StG 678941]
- Knut and Alice Wallenberg Foundation [2015.0057]
- Chalmers Areas of Advance Nanoscience and Nanotechnology
- Swedish Foundation [RMA11-0037]
- Polish National Science Center [2012/07/D/ST3/02152]
- Russian Federal Agency for Scientific Organizations [0303-2016-0001]
- People Programme (Marie Curie Actions) of the European Union's Seventh Framework Programme under REA [609405]
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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