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

Thomas J.A. Slater; Alexandra Macedo; Sven L.M. Schroeder; M. Grace Burke; Paul O'Brien; Pedro H.C. Camargo; Sarah J. Haigh

doi:10.1021/nl4047448

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

Thomas J.A. Slater
, Alexandra Macedo
, Sven L.M. Schroeder
, M. Grace Burke
, Paul O'Brien
, Pedro H.C. Camargo
, Sarah J. Haigh

Nuclear Materials Performance

Research output: Contribution to journal › Article › peer-review

134 Scopus citations

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.

Original language	English
Pages (from-to)	1921-1926
Number of pages	6
Journal	Nano Letters
Volume	14
Issue number	4
DOIs	https://doi.org/10.1021/nl4047448
State	Published - Apr 9 2014

Keywords

Galvanic replacement reaction
electron tomography
energy dispersive X-ray spectroscopy
heterogeneous catalysis
hollow bimetallic nanoparticles
scanning transmission electron microscopy

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10.1021/nl4047448

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title = "Correlating catalytic activity of Ag-Au nanoparticles with 3D compositional variations",

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.",

keywords = "Galvanic replacement reaction, electron tomography, energy dispersive X-ray spectroscopy, heterogeneous catalysis, hollow bimetallic nanoparticles, scanning transmission electron microscopy",

author = "Slater, \{Thomas J.A.\} and Alexandra Macedo and Schroeder, \{Sven L.M.\} and Burke, \{M. Grace\} and Paul O'Brien and Camargo, \{Pedro H.C.\} and Haigh, \{Sarah J.\}",

year = "2014",

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doi = "10.1021/nl4047448",

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journal = "Nano Letters",

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publisher = "American Chemical Society",

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TY - JOUR

T1 - Correlating catalytic activity of Ag-Au nanoparticles with 3D compositional variations

AU - Slater, Thomas J.A.

AU - Macedo, Alexandra

AU - Schroeder, Sven L.M.

AU - Burke, M. Grace

AU - O'Brien, Paul

AU - Camargo, Pedro H.C.

AU - Haigh, Sarah J.

PY - 2014/4/9

Y1 - 2014/4/9

N2 - 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.

AB - 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.

KW - Galvanic replacement reaction

KW - electron tomography

KW - energy dispersive X-ray spectroscopy

KW - heterogeneous catalysis

KW - hollow bimetallic nanoparticles

KW - scanning transmission electron microscopy

UR - https://www.scopus.com/pages/publications/84898009452

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DO - 10.1021/nl4047448

M3 - Article

AN - SCOPUS:84898009452

SN - 1530-6984

VL - 14

SP - 1921

EP - 1926

JO - Nano Letters

JF - Nano Letters

IS - 4

ER -

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

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Keywords

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