Grain boundary mediated hydriding phase transformations in individual polycrystalline metal nanoparticles.

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 bound

SUBMITTER: Alekseeva S 

PROVIDER: S-EPMC5651804 | biostudies-literature | 2017 Oct

REPOSITORIES: biostudies-literature