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Unravelling the nucleation mechanism of bimetallic nanoparticles with composition-tunable core–shell arrangement

Ting-Wei Liao, Anupam Yadav, Kuo-Juei Hu, Johan van der Tol, Salvatore Cosentino, Francesco D'Acapito, Richard Palmer Orcid Logo, Cristina Lenardi, Riccardo Ferrando, Didier Grandjean, Peter Lievens

Nanoscale, Volume: 10, Issue: 14, Pages: 6684 - 6694

Swansea University Author: Richard Palmer Orcid Logo

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DOI (Published version): 10.1039/C8NR01481G

Abstract

The structure and atomic ordering of Au–Ag nanoparticles grown in the gas phase are determined by a combination of HAADF-STEM, XPS and Refl-XAFS techniques as a function of composition. It is shown consistently from all the techniques that an inversion of chemical ordering takes place by going from...

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Published in: Nanoscale
ISSN: 2040-3364 2040-3372
Published: 2018
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URI: https://cronfa.swan.ac.uk/Record/cronfa39341
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Abstract: The structure and atomic ordering of Au–Ag nanoparticles grown in the gas phase are determined by a combination of HAADF-STEM, XPS and Refl-XAFS techniques as a function of composition. It is shown consistently from all the techniques that an inversion of chemical ordering takes place by going from Au-rich to Ag-rich compositions, with the minority element always occupying the nanoparticle core, and the majority element enriching the shell. With the aid of DFT calculations, this composition-tunable chemical arrangement is rationalized in terms of a four-step growth process in which the very first stage of cluster nucleation plays a crucial role. The four-step growth mechanism is based on mechanisms of a general character, likely to be applicable to a variety of binary systems besides Au–Ag.
College: College of Engineering
Issue: 14
Start Page: 6684
End Page: 6694