Structural defect induced peak splitting in gold–copper bimetallic nanorods during growth by single particle spectroscopy

Thota, Sravan; Chen, Shutang; Zhou, Yadong; Zhang, Yong; Zou, Shengli; Zhao, Jing

doi:10.1039/c5nr03979g

Cited by 17 publications

(14 citation statements)

References 52 publications

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“…structures result in peak broadening due to a combinatorial effect of different SPR behaviour of two metals. [19,46] A similar trend is observed when Ag + ions are used for the GR reaction with the Cu@Fabric (Figure 3b). Peak broadening and enhancement of photo-absorption is observed in the ca.…”

Section: Characterization Of Cu-m X @Fabricssupporting

confidence: 77%

“…[5,42,43] Metal nanoparticles of Ag, Au and Cu are known for their strong LSPR properties, and may therefore be suitable candidates for LSPRinduced catalytic enhancement reactions. [5,34,[44][45][46] However, the use of solvent-dispersed metal colloids as catalysts is not without challenges, including potential nanoparticle aggregation during the reaction compromising the reproducibility, and difficulties associated with catalyst recovery and product purification post-reaction. [47][48][49][50] Many of these shortcomings can be addressed through depositing the catalyst on the surface of nano-and micro-structured templates.…”

Section: Introductionmentioning

confidence: 99%

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LSPR‐Induced Catalytic Enhancement Using Bimetallic Copper Fabrics Prepared by Galvanic Replacement Reactions

Anderson

O’Mullane

Gaspera

et al. 2019

Adv Materials Inter

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A simple galvanic replacement (GR) reaction‐based strategy to create copper‐based bimetallic fabrics for photoreductive catalysis is reported. It is shown that a nanostructured Cu@Fabric can be easily converted into bimetallic Cu‐Au@Fabric and Cu‐Ag@Fabric through a spontaneous electroless process that involves simple exposure of copper fabrics to the aqueous solutions of gold and silver ions. The nanoscale hierarchical ordering of cotton fabrics combined with their high porosity and wettability make them outstanding supports for catalyst recovery and reusability. The deposition of miniscule quantities of expensive noble metals on readily available Cu not only reduces the overall catalyst cost, but also plays a major role in improving the catalyst stability and reusability over several cycles through minimizing Cu oxidation. The synergistic effects of the localized surface plasmon resonance (LSPR) properties of Cu, Au, and Ag allow these bimetallic fabrics into highly active visible light photocatalysts. Mechanistic investigation of the photocatalytic activity provides in‐depth information on the electron transfer processes occurring at the catalyst/ reactant interface, revealing electron transport as the rate‐limiting step, which could be overcome under visible light photoillumination conditions. The outcomes enhance the understanding of template‐supported bimetallic nanostructures for LSPR‐induced photocatalysis applications, offering new potential to design multifunctional fabrics for various applications.

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Section: Characterization Of Cu-m X @Fabricssupporting

confidence: 77%

Section: Introductionmentioning

confidence: 99%

LSPR‐Induced Catalytic Enhancement Using Bimetallic Copper Fabrics Prepared by Galvanic Replacement Reactions

Anderson

O’Mullane

Gaspera

et al. 2019

Adv Materials Inter

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“…To obtain a rationale for the surprising outcome in the Ag–Pt system, we performed in situ studies, from which we determined that the complex Ag/AgCl/Pt morphology is the result of a dynamic sequence of structural steps in the galvanic exchange reaction. Dynamics, which are otherwise hidden in ensemble‐level studies, are captured by in situ plasmonic spectroscopy of single Ag NPs undergoing galvanic exchange. Single‐nanoparticle studies also reveal differences in the trajectories of individual NPs undergoing galvanic exchange.…”

Section: Figurementioning

confidence: 99%

In Situ Single‐Nanoparticle Spectroscopy Study of Bimetallic Nanostructure Formation

2016

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Bimetallic nanostructures (NSs), with utility in catalysis, are typically prepared using galvanic exchange (GE), but the final catalyst morphology is dictated by the dynamics of the process. In situ single nanoparticle (NP) optical scattering spectroscopy, coupled with ex situ electron microscopy, is used to capture the dynamic structural evolution of a bimetallic NS formed in a GE reaction between Ag and [PtCl6]2−. We identify an early stage involving anisotropic oxidation of Ag to AgCl concomitant with reductive deposition of small Pt clusters on the NS surface. At later stages of GE, unreacted Ag inclusions phase segregate from the overcoated AgCl as a result of lattice strain between Ag and AgCl. The nature of the structural evolution elucidates why multi‐domain Ag/AgCl/Pt NSs result from the GE process. The complex structural dynamics, determined from single‐NP trajectories, would be masked in ensemble studies due to heterogeneity in the response of different NPs.

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“…Copper precursor was injected into the reaction solution at 140 °C after the formation of spherical Au seeds. It was allowed to react for 20 min to form Au–Cu rods, as previously reported . The reaction solution was then cooled to 60 °C and silver precursor was injected and reacted for 20 min.…”

Section: Methodsmentioning

confidence: 99%

Au–Cu–Ag Nanorods Synthesized by Seed‐Mediated Coreduction and Their Optical Properties

Chen

Reggiano

Thota

et al. 2017

Part & Part Syst Charact

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Development of trimetallic nanoparticles can potentially broaden the optical window for plasmonic applications, but can also offer new photocatalysts for organic synthesis. The optical and catalytic properties can be tuned by the ratio between different components and how they are distributed in the nanoparticles, in addition to their size and shape. This work reports a seed‐mediated coreduction method for the fabrication of Au‐Cu‐Ag nanorods in oil phase. The composition and morphology of trimetallic Au‐Cu‐Ag nanostructures can be controlled by adjusting the injection temperature and the concentration of silver precursor. An additional peak (around 395 nm) is observed in extinction spectrum of trimetallic Au‐Cu‐Ag nanorods compared to that of bimetallic Au‐Cu nanorods, caused by the segregated silver composition in the trimetallic nanorods. The reported synthesis can be used to develop a wide range of trimetallic nanostructures with tunable optical properties and functionality.

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Structural defect induced peak splitting in gold–copper bimetallic nanorods during growth by single particle spectroscopy

Cited by 17 publications

References 52 publications

LSPR‐Induced Catalytic Enhancement Using Bimetallic Copper Fabrics Prepared by Galvanic Replacement Reactions

LSPR‐Induced Catalytic Enhancement Using Bimetallic Copper Fabrics Prepared by Galvanic Replacement Reactions

In Situ Single‐Nanoparticle Spectroscopy Study of Bimetallic Nanostructure Formation

Au–Cu–Ag Nanorods Synthesized by Seed‐Mediated Coreduction and Their Optical Properties

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