Publication
Title
Quantitative 3D characterization of elemental diffusion dynamics in individual Ag@Au nanoparticles with different shapes
Author
Abstract
Anisotropic bimetallic nanoparticles are promising candidates for plasmonic and catalytic applications. Their catalytic performance and plasmonic properties are closely linked to the distribution of the two metals, which can change during applications in which the particles are exposed to heat. Due to this fact, correlating the thermal stability of complex heterogeneous nanoparticles to their microstructural properties is of high interest for the practical applications of such materials. Here, we employ quantitative electron tomography in high-angle annular dark-field scanning transmission electron microscopy (HAADF-STEM) mode to measure the 3D elemental diffusion dynamics in individual anisotropic Au–Ag nanoparticles upon heating in situ. This approach allows us to study the elemental redistribution in complex, asymmetric nanoparticles on a single particle level, which has been inaccessible to other techniques so far. In this work, we apply the proposed method to compare the alloying dynamics of Au–Ag nanoparticles with different shapes and compositions and find that the shape of the nanoparticle does not exhibit a significant effect on the alloying speed whereas the composition does. Finally, comparing the experimental results to diffusion simulations allows us to estimate the diffusion coefficients of the metals for individual nanoparticles.
Language
English
Source (journal)
ACS nano. - -
Publication
2019
ISSN
1936-0851
DOI
10.1021/ACSNANO.9B06848
Volume/pages
13 :11 (2019) , p. 13421-13429
ISI
000500650000115
Pubmed ID
31626527
Full text (Publisher's DOI)
Full text (open access)
Full text (publisher's version - intranet only)
UAntwerpen
Faculty/Department
Research group
Project info
Correlating the 3D atomic structure of metal anisotropic nanoparticles with their optical properties (SOPMEN).
MULTIMAT: A multiscale approach towards mesostructured porous material design
Enabling science and technology through European electron microscopy (ESTEEM3).
European infrastructure for spectroscopy, scattering and imaging of soft matteer (EUSMI).
Three-dimensional characterization of the growth of anisotropic Au nanoparticles.
Spectral electron tomography as a quantitative technique to investigate functional nanomaterials.
Three-dimensional atomic modelling of functional nanocrystalline structures from a single viewing direction.
Complex hetero-nanosystems: three-dimensional characterisation down to the atomic scale.
Publication type
Subject
Affiliation
Publications with a UAntwerp address
External links
Web of Science
Record
Identifier
Creation 21.11.2019
Last edited 02.10.2024
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