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

Slater, Thomas J. A. ORCID: https://orcid.org/0000-0003-0372-1551, 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:	17 May 2023 20:53
URI:	https://orca.cardiff.ac.uk/id/eprint/148240

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