Interdiffusion in epitaxial, single-crystalline Au/Ag thin films studied by Auger electron spectroscopy sputter-depth profiling and positron annihilation

Noah, Martin A.; Flötotto, David; Wang, Zumin; Reiner, Markus; Hugenschmidt, C.; Mittemeijer, E. J.

doi:10.1016/j.actamat.2016.01.061

Cited by 15 publications

(6 citation statements)

References 52 publications

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“…Although our results were observed at around 400 °C, the fitting curve of the diffusion coefficients can be used for estimating the activation energy and the diffusion coefficients at other temperatures as shown in Table S3, (Supporting Information for 450 °C. The nanoparticles in our study show similar activation energy as bulk materials [ 41,42 ] (about 1.3*10 24 eV/mol). The diffusion coefficients predicted by our method also fit well to tabulated bulk values and other referenced Au@Ag NPs [ 15,43 ] at 450 °C.…”

Section: Resultssupporting

confidence: 68%

Estimation of Temperature Homogeneity in MEMS‐Based Heating Nanochips via Quantitative HAADF‐STEM Tomography

Chen,

Skorikov,

van der Hoeven

et al. 2023

Part & Part Syst Charact

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Sample holders for transmission electron microscopy (TEM) based on micro‐electro‐mechanical systems (MEMS) have recently become popular for investigating the behavior of nanomaterials under in situ or environmental conditions. The accuracy and reproducibility of these in situ holders are essential to ensure the reliability of experimental results. In addition, the uniformity of an applied temperature trigger across the MEMS chip is a crucial parameter. In this work, it is measured the temperature homogeneity of MEMS‐based heating sample supports by locally analyzing the dynamics of heat‐induced alloying of Au@Ag nanoparticles located in different regions of the support through quantitative fast high‐angle annular dark‐field scanning TEM tomography. These results demonstrate the superior temperature homogeneity of a microheater design based on a heating element shaped as a circular spiral with a width decreasing outwards compared to a double spiral‐shaped designed microheater. The proposed approach to measure the local temperature homogeneity based on the thermal properties of bimetallic nanoparticles will support the future development of MEMS‐based heating supports with improved thermal properties and in situ studies where high precision in the temperature at a certain position is required.

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Section: Resultssupporting

confidence: 68%

Estimation of Temperature Homogeneity in MEMS‐Based Heating Nanochips via Quantitative HAADF‐STEM Tomography

Chen,

Skorikov,

van der Hoeven

et al. 2023

Part & Part Syst Charact

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“…Indeed, for diffusion of Au in Ag, which is the limiting process in our experiment since Ag in Au diffusion is faster, tabulated bulk diffusion coefficients are around 2 × 10 −19 m 2 /s at 450 °C. 43,44 Interestingly, although the size-dependent increase in the alloying speed is a concern for the stability of Au−Ag core−shell nanoparticles with diameters below 5 nm, 45 the alloying dynamics of particles studied in this work (with characteristic sizes larger than 20 nm) follow the bulk material behavior. Although studying the size-dependent, shapedependent, and composition-dependent alloying dynamics in more detail lies beyond the scope of this work, our methodology allows for doing so on a single nanoparticle basis and will be valuable for future work in that direction.…”

Section: Resultsmentioning

confidence: 81%

Quantitative 3D Characterization of Elemental Diffusion Dynamics in Individual Ag@Au Nanoparticles with Different Shapes

et al. 2019

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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 darkfield 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 was 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.

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“…From Table 2, we conclude that the obtained values of diffusion coefficients for all NPs investigated in this work are of the same order of magnitude as those reported for Au and Ag interdiffusion in bulk Au-Ag solid solutions and for single-crystalline Au/Ag thin films. [46,47] This suggests that the difference in the volumes of the NPs at the investigated length scale does not affect the alloying dynamics significantly. A slightly higher diffusion coefficient can be observed for SC-NRs when compared to SC-NCs.…”

Section: Alloying Of Au@ag Single-crystalline and Pentatwinned Nanorodsmentioning

confidence: 86%

The Influence of Size, Shape, and Twin Boundaries on Heat‐Induced Alloying in Individual Au@Ag Core–Shell Nanoparticles

Mychinko

Skorikov

Albrecht

et al. 2021

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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.

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Interdiffusion in epitaxial, single-crystalline Au/Ag thin films studied by Auger electron spectroscopy sputter-depth profiling and positron annihilation

Cited by 15 publications

References 52 publications

Estimation of Temperature Homogeneity in MEMS‐Based Heating Nanochips via Quantitative HAADF‐STEM Tomography

Estimation of Temperature Homogeneity in MEMS‐Based Heating Nanochips via Quantitative HAADF‐STEM Tomography

Quantitative 3D Characterization of Elemental Diffusion Dynamics in Individual Ag@Au Nanoparticles with Different Shapes

The Influence of Size, Shape, and Twin Boundaries on Heat‐Induced Alloying in Individual Au@Ag Core–Shell Nanoparticles

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