Thermal Activation of Gold Atom Diffusion in Au@Pt Nanorods

Understanding the thermal stability of bimetallic nanoparticles is of vital importance to preserve their functionalities during their use in a variety of applications. In contrast to well-studied bimetallic systems such as Au@Ag, heat-induced morphological and compositional changes in Au@Pt nanopart...

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Bibliographic Details
Published in:ACS nano 2022-06, Vol.16 (6), p.9608-9619
Main Authors: Pedrazo-Tardajos, Adrián, Arslan Irmak, Ece, Kumar, Vished, Sánchez-Iglesias, Ana, Chen, Qiongyang, Wirix, Maarten, Freitag, Bert, Albrecht, Wiebke, Van Aert, Sandra, Liz-Marzán, Luis M., Bals, Sara
Format: Article
Language:English
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Summary:Understanding the thermal stability of bimetallic nanoparticles is of vital importance to preserve their functionalities during their use in a variety of applications. In contrast to well-studied bimetallic systems such as Au@Ag, heat-induced morphological and compositional changes in Au@Pt nanoparticles are insufficiently understood, even though Au@Pt is an important material for catalysis. To investigate the thermal instability of Au@Pt nanorods at temperatures below their bulk melting point, we combined in situ heating with two- and three-dimensional electron microscopy techniques, including three-dimensional energy-dispersive X-ray spectroscopy. The experimental results were used as input for molecular dynamics simulations, to unravel the mechanisms behind the morphological transformation of Au@Pt core–shell nanorods. We conclude that thermal stability is influenced not only by the degree of coverage of Pt on Au but also by structural details of the Pt shell.
ISSN:1936-0851
1936-086X
DOI:10.1021/acsnano.2c02889