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

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

doi:10.1021/nl4047448

Cited by 123 publications

(123 citation statements)

References 39 publications

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“…% (Table 2). A recent report studied hollow AuAg alloy rings and the composition effect on the segregation of Au and Ag based on the EDS elemental mapping data [36]. However, our observation found no such segregation.…”

Section: Microstructural and Characteristic Analysescontrasting

confidence: 60%

Effect of Ag Templates on the Formation of Au-Ag Hollow/Core-Shell Nanostructures

Tsai¹,

Chen²,

Song³

et al. 2015

Nanoscale Res Lett

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Au-Ag alloy nanostructures with various shapes were synthesized using a successive reduction method in this study. By means of galvanic replacement, twined Ag nanoparticles (NPs) and single-crystalline Ag nanowires (NWs) were adopted as templates, respectively, and alloyed with the same amount of Au + ions. High angle annular dark field-scanning TEM (HAADF-STEM) images observed from different rotation angles confirm that Ag NPs turned into AuAg alloy rings with an Au/Ag ratio of 1. The shifts of surface plasmon resonance and chemical composition reveal the evolution of the alloy ring formation. On the other hand, single-crystalline Ag NWs became Ag@AuAg core-shell wires instead of hollow nanostructure through a process of galvanic replacement. It is proposed that in addition to the ratio of Ag templates and Au ion additives, the twin boundaries of the Ag templates were the dominating factor causing hollow alloy nanostructures.

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Section: Microstructural and Characteristic Analysescontrasting

confidence: 60%

Effect of Ag Templates on the Formation of Au-Ag Hollow/Core-Shell Nanostructures

Tsai¹,

Chen²,

Song³

et al. 2015

Nanoscale Res Lett

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“…Another field of application where hollow nanostructures perform better than their solid counterparts is catalysis [14,93,111,184,194,[228][229][230][231][232]. It should be noted here that the Pt-or Pd-based nanostructures have better catalytic activity or the addition of these elements to the AuAg nanostructures increase their catalytic activity, yet they have poor plasmonic properties [14,93,111,194,224,226].…”

Section: Applications Of Hollow Nanostructures and Advantages Vs Solmentioning

confidence: 89%

Hollow metal nanostructures for enhanced plasmonics: synthesis, local plasmonic properties and applications

et al. 2016

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Metallic nanostructures have received great attention due to their ability to generate surface plasmon resonances, which are collective oscillations of conduction electrons of a material excited by an electromagnetic wave. Plasmonic metal nanostructures are able to localize and manipulate the light at the nanoscale and, therefore, are attractive building blocks for various emerging applications. In particular, hollow nanostructures are promising plasmonic materials as cavities are known to have better plasmonic properties than their solid counterparts thanks to the plasmon hybridization mechanism. The hybridization of the plasmons results in the enhancement of the plasmon fields along with more homogeneous distribution as well as the reduction of localized surface plasmon resonance (LSPR) quenching due to absorption. In this review, we summarize the efforts on the synthesis of hollow metal nanostructures with an emphasis on the galvanic replacement reaction. In the second part of this review, we discuss the advancements on the characterization of plasmonic properties of hollow nanostructures, covering the single nanoparticle experiments, nanoscale characterization via electron energy-loss spectroscopy and modeling and simulation studies. Examples of the applications, i.e. sensing, surface enhanced Raman spectroscopy, photothermal ablation therapy of cancer, drug delivery or catalysis among others, where hollow nanostructures perform better than their solid counterparts, are also evaluated.

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“…Bimetallic and hollow metallic nanostructures, such as nanoshells, are very attractive for catalytic and electrocatalytic applications [1][2][3][4][5][6][7]. While bimetallic compositions allow for the combination and/or synergism of catalytic properties between the metal components, their hollow interiors provide higher surface-to-volume ratios relative to their solid analogs [4,[8][9][10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

“…In each of these systems, the composition could be systematically tuned by varying the molar ratios between Ag and each metal precursor. As the galvanic reaction employing Ag nanospheres as templates leads to nanoshells displaying similar sizes/morphology [1], it enables us to separate and investigate the effect of composition in the trimetallic materials relative to their bimetallic counterparts over their catalytic performances toward the reduction of 4-nitrophenol as a model reaction [33]. Our data demonstrate a significant enhancement on the catalytic activities upon the formation of the trimetallic nanoshells, and the magnitude of this enhancement relative to the bimetallic nanoshells of similar compositions was dependent on the nature of the metals.…”

Section: Introductionmentioning

confidence: 99%

Probing the catalytic activity of bimetallic versus trimetallic nanoshells

et al. 2015

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The synthesis of trimetallic nanoparticles represents an emerging strategy to maximize catalytic performances in noble metal-based catalysts. However, the controllable synthesis of trimetallic nanomaterials as well as the exact role played by the addition of a third metal in their composition over catalytic performances remains unclear. In this paper, we describe the synthesis of trimetallic nanoshells having AgAuPd, AgAuPt, and AgPdPt compositions by a sequential galvanic replacement reaction approach between Ag nanospheres as sacrificial templates and the corresponding metal precursors, i.e., AuCl 4 -(aq) , PdCl 4 2-(aq) , and/or PtCl 6 2-(aq) . In each of these systems, the composition could be systematically tuned by varying the molar ratios between Ag and each metal precursor. Nanoshells having Ag 56 Au 28 Pd 16 , Ag 78 Au 9 Pt 13 , and Ag 71 Pd 16 Pt 13 compositions were employed as model systems to investigate the effect of the addition of the third metal in their composition over the catalytic activities toward the 4-nitrophenol reduction. Our data demonstrate a significant enhancement in conversion percentages and thus the catalytic activities relative to the sum of their bimetallic counterparts, and this increase was dependent on the nature of the metals, corresponding to 826, 135, and 56 % for Ag 56 Au 28 Pd 16 , Ag 78 Au 9 Pt 13 , and Ag 71 Pd 16 Pt 13 nanoshells relative to their bimetallic analogs. The results presented herein demonstrate the strong correlation between catalytic activity and composition in multimetallic nanoshells, and that the incorporation of a third metal may represent a promising approach to boost catalytic activities for a variety of transformations.

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

Cited by 123 publications

References 39 publications

Effect of Ag Templates on the Formation of Au-Ag Hollow/Core-Shell Nanostructures

Effect of Ag Templates on the Formation of Au-Ag Hollow/Core-Shell Nanostructures

Hollow metal nanostructures for enhanced plasmonics: synthesis, local plasmonic properties and applications

Probing the catalytic activity of bimetallic versus trimetallic nanoshells

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