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

Autor(es)

Slater, Thomas J. A. ^[1] ; Macedo, Alexandra ^[2] ; Schroeder, Sven L. M. ^{[3, 4]} ; Burke, M. Grace ^[1] ; O'Brien, Paul ^{[3, 1]} ; Camargo, Pedro H. C. ^[2] ; Haigh, Sarah J. ^[1]

Afiliação do(s) autor(es)

^[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, Manchester M13 9PL, Lancs - England

^[4] Univ Manchester, Sch Chem Engn & Analyt Sci, Manchester M13 9PL, Lancs - England

• Tipo de documento: Artigo Científico
• Fonte: Nano Letters; v. 14, n. 4, p. 1921-1926, APR 2014.
• Citações Web of Science: 76

Resumo

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)

• Processo FAPESP: 11/06847-0 - Nanoestruturas polimetálicas contendo interiores vazios e tamanho, forma e composições definidas
• Beneficiário: Pedro Henrique Cury Camargo
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 13/19861-6 - Nanomateriais metálicos controlados para aplicações em catálise
• Beneficiário: Pedro Henrique Cury Camargo
• Modalidade de apoio: Auxílio à Pesquisa - Regular