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Meeting 6th International Congress on 3D Materials Science (3DMS 2022)
Symposium 6th International Congress on 3D Materials Science (3DMS 2022)
Presentation Title Atomic-resolution 3D Analysis of Pt-Ru Alloy Nanoparticles by Electron Tomography
Author(s) Tomokazu Yamamoto, Koji Shigematsu, Kohei Kusada, Hiroshi Kitagawa, Syo Matsumura
On-Site Speaker (Planned) Tomokazu Yamamoto
Abstract Scope Electron tomography (ET) is an important characterization tool for the investigation of catalytic alloy nanoparticles because their properties depends on morphological and structural factors; their size, shapes, surface compositions, segregation patterns and so on. Aberration-corrected scanning transmission electron microscopy (STEM) imaging and recent progress of tomographic reconstruction algorism such as a generalized Fourier iterative reconstruction (GENFIRE) developed by A. Pryor Jr. et al. has enabled atomic-resolution tomographic reconstruction of metal nanoparticles. In this study, we applied atomic-resolution ET on 3D structural analysis of multiple twined Pt-Ru alloy nanoparticles which is a promising anode catalyst for direct methanol fuel cells. The GENFIRE reconstructions from 45 STEM images of the nanoparticles reveals 3D segregated element distributions and multiple twined structure with {111} twin boundary. The resolution of the reconstructed images varied with direction due to missing-wedge artifacts from limited angle reconstruction and diffraction contrasts in STEM images.
Proceedings Inclusion? Definite: Other

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