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| Azevedo, Nuno Monteiro |
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Albrecht, Wiebke
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Publications (7/7 displayed)
- 2024Estimation of Temperature Homogeneity in MEMS-Based Heating Nanochips via Quantitative HAADF-STEM Tomography
- 2024Unexpectedly high thermal stability of Au nanotriangle@mSiO<sub>2</sub> yolk–shell nanoparticlescitations
- 2024Estimation of Temperature Homogeneity in MEMS‐Based Heating Nanochips via Quantitative HAADF‐STEM Tomographycitations
- 2022Quantitatively linking morphology and optical response of individual silver nanohedracitations
- 2021Quantitative morphometric analysis of single gold nanoparticles by optical extinction microscopy: material permittivity and surface damping effectscitations
- 2021The influence of size, shape, and twin boundaries on heat-induced alloying in individual Au@Ag core-shell nanoparticlescitations
- 2017Fully alloyed metal nanorods with highly tunable properties
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article
The influence of size, shape, and twin boundaries on heat-induced alloying in individual Au@Ag core-shell nanoparticles
Abstract
Environmental conditions during real-world application of bimetallic core-shell nanoparticles (NPs) often include the use of elevated temperatures, which are known to cause elemental redistribution, in turn significantly altering the properties of these nanomaterials. Therefore, a thorough understanding of such processes is of great importance. The recently developed combination of fast electron tomography with in situ heating holders is a powerful approach to investigate heat-induced processes at the single NP level, with high spatial resolution in 3D. In combination with 3D finite-difference diffusion simulations, this method can be used to disclose the influence of various NP parameters on the diffusion dynamics in Au@Ag core-shell systems. A detailed study of the influence of heating on atomic diffusion and alloying for Au@Ag NPs with varying core morphology and crystallographic details is carried out. Whereas the core shape and aspect ratio of the NPs play a minor role, twin boundaries are found to have a strong influence on the elemental diffusion.