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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Correlating Catalytic Activity of Ag-Au Nanoparticles with 3D Compositional Variations

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Slater, Thomas J. A. [1] ; Macedo, Alexandra [2] ; Schroeder, Sven L. M. [3, 4] ; Burke, M. Grace [1] ; O'Brien, Paul [1, 4] ; Camargo, Pedro H. C. [2] ; Haigh, Sarah J. [1]
Total Authors: 7
[1] Univ Manchester, Sch Mat, Manchester M13 9PL, Lancs - England
[2] Univ Sao Paulo, Inst Quim, Dept Quim Fundamental, BR-05508000 Sao Paulo - Brazil
[3] Univ Manchester, Sch Chem Engn & Analyt Sci, Manchester M13 9PL, Lancs - England
[4] Univ Manchester, Sch Chem, Manchester M13 9PL, Lancs - England
Total Affiliations: 4
Document type: Journal article
Source: Nano Letters; v. 14, n. 4, p. 1921-1926, APR 2014.
Web of Science Citations: 76

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 Xray (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. (AU)

FAPESP's process: 13/19861-6 - Controlled metal nanomaterials for catalysis applications
Grantee:Pedro Henrique Cury Camargo
Support type: Regular Research Grants
FAPESP's process: 11/06847-0 - Multimetallic nanostructures with hollow interiors and well-defined sizes, shapes and compositions
Grantee:Pedro Henrique Cury Camargo
Support type: Regular Research Grants