Correlating Catalytic Activity of Ag–Au Nanoparticles with 3D Compositional Variations | Zendy

Thomas J. A. Slater | Zendy; Alexandra Macedo | Zendy; Sven L. M. Schroeder | Zendy; M.G. Burke | Zendy; Paul O’Brien | Zendy; Pedro H. C. Camargo | Zendy; Sarah J. Haigh | Zendy

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

Author(s) -

Thomas J. A. Slater,

Alexandra Macedo,

Sven L. M. Schroeder,

M.G. Burke,

Paul O’Brien,

Pedro H. C. Camargo,

Sarah J. Haigh

Publication year - 2014

Publication title -

nano letters

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 4.853

H-Index - 488

eISSN - 1530-6992

pISSN - 1530-6984

DOI - 10.1021/nl4047448

Subject(s) - bimetallic strip , scanning transmission electron microscopy , nanoparticle , catalysis , cyclohexane , materials science , transmission electron microscopy , scanning electron microscope , atom (system on chip) , phenylacetylene , galvanic cell , atom probe , colloidal gold , chemical engineering , analytical chemistry (journal) , nanotechnology , chemistry , metallurgy , biochemistry , organic chemistry , chromatography , computer science , engineering , composite material , embedded system

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.

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