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Real-time imaging and elemental mapping of AgAu nanoparticle transformations

Lewis, E. A., Slater, T. J. A. ORCID:, Prestat, E., Macedo, A., O'Brien, P., Camargo, P. H. C. and Haigh, S. J. 2014. Real-time imaging and elemental mapping of AgAu nanoparticle transformations. Nanoscale 6 (22) , 13598–13605. 10.1039/C4NR04837G

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We report the controlled alloying, oxidation, and subsequent reduction of individual AgAu nanoparticles in the scanning transmission electron microscope (STEM). Through sequential application of electron beam induced oxidation and in situ heating and quenching, we demonstrate the transformation of Ag–Au core–shell nanoparticles into: AgAu alloyed, Au–Ag core–shell, hollow Au–Ag2O core–shell, and Au–Ag2O yolk-shell nanoparticles. We are able to directly image these morphological transformations in real-time at atomic resolution and perform energy dispersive X-ray (EDX) spectrum imaging to map changing elemental distributions with sub-nanometre resolution. By combining aberration corrected STEM imaging and high efficiency EDX spectroscopy we are able to quantify not only the growth and coalescence of Kirkendall voids during oxidation but also the compositional changes occurring during this reaction. This is the first time that it has been possible to track the changing distribution of elements in an individual nanoparticle undergoing oxidation driven shell growth and hollowing.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Chemistry
Cardiff Catalysis Institute (CCI)
Publisher: Royal Society of Chemistry
ISSN: 2040-3364
Date of First Compliant Deposit: 21 March 2022
Date of Acceptance: 11 September 2014
Last Modified: 12 May 2023 01:45

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