Synthesis of morphology controlled PtAu@Ag nanorings through concentric and eccentric growth pathways

Lee, Junghwa; Lee, Sung‐Woo; Kim, Guntae; Yoo, Sungjae; Lee, Mi Kyung; Son, Jiwoong; Hilal, Hajir; Go, Sungeun; Lee, Jaewon; Nam, Jwa‐Min; Park, Sungho

doi:10.1039/d1cc04026j

Cited by 7 publications

(6 citation statements)

References 23 publications

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“…Here, the morphology transformation from porous–spiny Au–Ag NPs to annular Au–Ag NPs is first achieved by enhanced element diffusion in the heating environment, suggesting a novel path for the morphologic control of NPs. Clearly, the above process to obtain porous–spiny and annular Au–Ag NPs is very simple and facile relative to the reported methods. , Furthermore, the SERS detection of trace thiram is completed using those optimized Au–Ag NPs as SERS-active substrates, attributed to their special morphology. The relationship between the morphology of Au–Ag NPs and their SERS activity is analyzed by finite difference time domain (FDTD) simulation.…”

Section: Introductionmentioning

confidence: 99%

Au–Ag Nanoparticles with Controllable Morphologies for the Surface-Enhanced Raman Scattering Detection of Trace Thiram

Sun

Cao

Yuan

et al. 2023

ACS Appl. Nano Mater.

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Surface-enhanced Raman scattering (SERS) technique has been limitedly applied to the detection of trace thiram due to the weak activity of employed substrates. In this work, Au–Ag nanoparticles (NPs) with controllable morphologies are synthesized and used as SERS-active substrates for the detection of trace thiram. Porous–spiny Au–Ag NPs are synthesized with spherical Ag NPs as intermediates through in situ redox. Annular Au–Ag NPs can be further obtained by heating porous–spiny Au–Ag NPs. Here, the morphology transformation of Au–Ag NPs is first completed by means of the element diffusion theory, providing a strategy for the morphology control of complex Au–Ag NPs. Additionally, these Au–Ag NPs with optimized morphologies were chosen as substrates for the successful SERS detection of trace thiram. Especially, porous–spiny Au–Ag NPs show superior sensitivity and reproducibility. Meanwhile, using porous–spiny Au–Ag NPs as SERS-active substrates, thiram can be quantitatively detected in the range from 10–3 to 10–11 M. Thus, it is inferred that Au–Ag NPs with optimized morphologies will have great potential in the field of trace analyte detection related to food safety and environmental protection.

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Section: Introductionmentioning

confidence: 99%

Au–Ag Nanoparticles with Controllable Morphologies for the Surface-Enhanced Raman Scattering Detection of Trace Thiram

Sun

Cao

Yuan

et al. 2023

ACS Appl. Nano Mater.

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“…In two-dimensional arrays of DRNs, it is anticipated that direct plasmonic coupling will occur at the junctions. It is expected that when the heterojunctions are formed between Au and Ag DRNs, the difference in electronegativity between the two metals would promote a more readily induced interaction of the strong localized surface plasmons (LSP) coupling compared to homojunctions consisting of only Au or Ag DRNs. − Consequently, this leads to a maximum enhancement of the electromagnetic field. This tendency is supported by finite element method (FEM) simulation, as depicted in Figure b–d (refer to Supplementary Note 1 for further details).…”

Section: Fabrication Of Tricomponent Dual-rim Nanoring (Drn) Substratesmentioning

confidence: 99%

Combinatorial Effect of Tricomponent Dual-Rim Nanoring Building Blocks: Label-Free SERS Detection of Biomolecules

Lee,

Kwon,

Lee

et al. 2024

Nano Lett.

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Detecting weakly adsorbing molecules via label-free surface-enhanced Raman scattering (SERS) has presented a significant challenge. To address this issue, we propose a novel approach for creating tricomponent SERS substrates using dual-rim nanorings (DRNs) made of Au, Ag, and CuO, each possessing distinct functionalities. Our method involves depositing different metals on Pt nanoring skeletons to obtain each nanoring with varying surface compositions while maintaining a similar size and shape. Next, the mixture of these nanorings is transferred into a monolayer assembly with homogeneous intermixing on a solid substrate. The surface of the CuO DRNs has dangling bonds (Cu 2+ ) that facilitate the strong adsorption of carboxylates through the formation of chelating bonds, while the combination of Au and Ag DRNs significantly enhances the SERS signal intensity through a strong coupling effect. Notably, the tricomponent assemblies enable the successful SERSbased analysis of biomolecules such as amino acids, proteins, nucleobases, and nucleotides.

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“…2H). 13,35 If we use bromide ions, a slow kinetic growth condition occurred (E1[Ag/AgBr] = 0.071 V) where Ag fills the space between the outer rims and inner rims of Pt DRNs, resulting in merging circular intra-nanogaps, eventually leading to the formation of Ag SRNs instead of Ag DRNs (Fig. S1, ESI †).…”

Section: Morphological Characterization Of Ag@au Hollow Drnsmentioning

confidence: 99%

Bimetallic alloy Ag@Au nanorings with hollow dual-rims focus near-field on circular intra-nanogaps

Lee¹,

Jung²,

Lee³

et al. 2023

Nanoscale Horiz.

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Synthesis of morphology controlled PtAu@Ag nanorings through concentric and eccentric growth pathways

Abstract: We report the synthetic methodology of silver nanorings with controlled nanoscale morphology. The morphology of Ag nanorings was kinetically controlled by electrochemical potential tuning of Ag deposition by halide counter-ions,...

Cited by 7 publications

References 23 publications

Au–Ag Nanoparticles with Controllable Morphologies for the Surface-Enhanced Raman Scattering Detection of Trace Thiram

Au–Ag Nanoparticles with Controllable Morphologies for the Surface-Enhanced Raman Scattering Detection of Trace Thiram

Combinatorial Effect of Tricomponent Dual-Rim Nanoring Building Blocks: Label-Free SERS Detection of Biomolecules

Bimetallic alloy Ag@Au nanorings with hollow dual-rims focus near-field on circular intra-nanogaps

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