Correlating catalytic activity of Ag-Au nanoparticles with 3D compositional variations.
Slater, TJA, Macedo, A, Schroeder, SLM et al. (4 more authors)
(2014)
Correlating catalytic activity of Ag-Au nanoparticles with 3D compositional variations.
Nano Letters, 14 (4).
1921 - 1926.
ISSN 1530-6984
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.
Metadata
Item Type:
Article
Authors/Creators:
Slater, TJA
Macedo, A
Schroeder, SLM
Burke, MG
O'Brien, P
Camargo, PHC
Haigh, SJ
Copyright, Publisher and Additional Information:
(c) American Chemical Society. 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.
Keywords:
Galvanic replacement reaction; Hollow bimetallic nanoparticles; Heterogeneous catalysis; Scanning transmission electron microscopy; Energy dispersive X-ray spectroscopy; Electron tomography
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