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  In Situ Atomic-Scale Observation of Surface Tension Induced Structural Transformation of Ag-NiPx Core-Shell Nanocrystals

Huang, X., Liu, Z., Millet, M.-M., Dong, J., Plodinec, M., Ding, F., et al. (2018). In Situ Atomic-Scale Observation of Surface Tension Induced Structural Transformation of Ag-NiPx Core-Shell Nanocrystals. ACS Nano. doi:10.1021/acsnano.8b03106.

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Huang, Xing1, 2, Autor           
Liu, Zhongqiang3, 4, Autor
Millet, Marie-Mathilde1, Autor           
Dong, Jichen4, Autor
Plodinec, Milivoj1, 5, Autor           
Ding, Feng3, 6, Autor
Schlögl, Robert1, 2, Autor           
Willinger, Marc Georg1, 7, Autor           
Affiliations:
1Inorganic Chemistry, Fritz Haber Institute, Max Planck Society, ou_24023              
2Heterogeneous Reactions, Max-Planck-Institute for Chemical Energy Conversion , Stiftstr. 34 - 36 45470 Mülheim an der Ruhr, Germany, ou_persistent13              
3Department of physics, Qufu Normal University, Qufu, 273165, P. R. China, ou_persistent22              
4Center for Multidimensional Carbon Materials, Institute for Basic Science (IBS), Ulsan 44919, Republic of Korea, ou_persistent22              
5Division of Material Physics, Rudjer Boskovic Institute, Bijenicka 54, 10000 Zagreb, Croatia, ou_persistent22              
6Department of Materials Science and Engineering, Ulsan National Institute of Science and Technology (UNIST), Ulsan 44919, Republic of Korea, ou_persistent22              
7Scientific Center for Optical and Electron Microscopy, ETH Zürich, Auguste-Piccard-Hof 1, 8093 Zürich, Switzerland, ou_persistent22              

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 Zusammenfassung: The properties of nanocrystals are highly depending on their morphology, composition and structure. Tailored synthesis over these parameters is successfully applied for the production of nanocrystals with desired properties for specific applications. However, in order to get a full control over the properties, the behavior of nanocrystals under external stimuli and application conditions needs to be understood. Herein, using Ag-NiPx nanocrystals as a model system, we investigate the structural evolution upon thermal-treatment by in situ aberration-corrected scanning transmission electron microscopy (STEM). A combination of real-time imaging with elemental analysis enables the observation of the transformation from a Ag-NiPx core-shell configuration to a Janus structure at the atomic scale. The transformation occurs through de-wetting and crystallization of the NiPx shell and is accompanied by surface segregation of Ag. Further temperature increase leads to a complete sublimation of Ag, and formation of individual Ni12P5 nanocrystals. The transformation is rationalized by theoretical modelling based on density functional theory (DFT) calculations. Our model suggests that the transformation is driven by changes of the surface energy of NiPx and the interfacial energy between NiPx and Ag. The here presented direct observation of atomistic dynamics during thermal-treatment induced structural modification will help to understand more complex transformations that are induced by ageing over time or the interaction with a reactive gas phase in applications such as catalysis.

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Sprache(n): eng - English
 Datum: 2018-04-252018-06-202018-06-20
 Publikationsstatus: Online veröffentlicht
 Seiten: 9
 Ort, Verlag, Ausgabe: -
 Inhaltsverzeichnis: -
 Art der Begutachtung: Expertenbegutachtung
 Identifikatoren: DOI: 10.1021/acsnano.8b03106
 Art des Abschluß: -

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Titel: ACS Nano
Genre der Quelle: Zeitschrift
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Ort, Verlag, Ausgabe: Washington, DC : American Chemical Society
Seiten: 9 Band / Heft: - Artikelnummer: - Start- / Endseite: - Identifikator: ISSN: 1936-0851
CoNE: https://pure.mpg.de/cone/journals/resource/1936-0851