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Correlating catalytic activity of Ag-Au nanoparticles with 3D compositional variations

Slater, Thomas J. A., Macedo, Alexandra, Schroeder, Sven L. M., Burke, M. Grace, O'Brien, Paul, Camargo, Pedro H. C. and Haigh, Sarah J. 2014. Correlating catalytic activity of Ag-Au nanoparticles with 3D compositional variations. Nano Letters 14 (4) , pp. 1921-1926. 10.1021/nl4047448

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Abstract

Significant elemental segregation is shown to exist within individual hollow silver–gold (Ag–Au) bimetallic nanoparticles obtained from the galvanic reaction between Ag particles and AuCl4–. Three-dimensional compositional mapping using energy dispersive X-ray (EDX) tomography within the scanning transmission electron microscope (STEM) reveals that nanoparticle surface segregation inverts from Au-rich to Ag-rich as Au content increases. Maximum Au surface coverage was observed for nanoparticles with approximately 25 atom % Au, which correlates to the optimal catalytic performance in a three-component coupling reaction among cyclohexane carboxyaldehyde, piperidine, and phenylacetylene.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Chemistry
Cardiff Catalysis Institute (CCI)
Additional Information: This is an open access article published under a Creative Commons Attribution (CC-BY) License, which permits unrestricted use, distribution and reproduction in any medium, provided the author and source are cited.
Publisher: American Chemical Society
ISSN: 1530-6984
Date of First Compliant Deposit: 30 March 2022
Last Modified: 30 Mar 2022 11:15
URI: https://orca.cardiff.ac.uk/id/eprint/148240

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