Direct synthesis of Au–Ag nanoframes by galvanic replacement <i>via</i> a continuous concaving process

Cheng, Fang; Gu, Wenjie; Zhang, Han; Song, Chunyuan; Zhu, Yunfeng; Ge, Feiyue; Qu, Kuiming; Xu, Hai; Wu, Xue‐Jun; Wang, Lianhui

doi:10.1039/d2nr01600a

Cited by 11 publications

(7 citation statements)

References 44 publications

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“…For CPOs-0.5, only AuAg nanoframes with a distinct LSPR peak around 880 nm are obtained (Figures i and S3). This observation closely resembles our previous findings, as the short etching time (0.5 min) is insufficient to induce a morphology change in the Ag NCs template. Interestingly, frame-like architectures with bumped nanoparticles emerged when highly rounded Ag NCs were used as templates.…”

Section: Resultsmentioning

confidence: 99%

“…The rational synthesis of CPOs is inspired by our recent investigation on the one-step construction of AuAg nanoframes . This process involves the reaction between Ag NCs and the Au precursor, Na 3 Au(S 2 O 3 ) 2 .…”

Section: Resultsmentioning

confidence: 99%

“…The rational synthesis of CPOs is inspired by our recent investigation on the one-step construction of AuAg nanoframes. 44 This process involves the reaction between Ag NCs and the Au precursor, Na 3 Au(S 2 O 3 ) 2 . To achieve siteselective galvanic replacement with precise structural tunability, a one-pot two-step synthetic approach was developed.…”

Section: Synthesis Of 3d Cpos By Galvanic Replacementmentioning

confidence: 99%

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3D Connected Plasmonic Octamers for Boosting Single-Particle Surface-Enhanced Raman Scattering

Cheng,

Hu,

Zhang

et al. 2024

J. Phys. Chem. C

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Three-dimensional (3D) complex plasmonic intragap nanostructures (PINs) have attracted significant attention in the field of surface-enhanced Raman scattering (SERS) owing to their abundance of interior gaps and voids, which enable robust near-field focusing. However, developing a simple, precise, and reproducible synthetic strategy remains a great challenge, as the preparation of such complex nanostructures often demands multiple laborious synthetic steps with controlled chemistry. Here, we present a facile one-pot approach for synthesizing 3D complex PINs, termed connected plasmonic octamers (CPOs), consisting of eight nanoparticles arranged in a cubic configuration and interconnected with metal bridges. The synthesis involves the selective etching of Ag nanocubes (NCs) followed by galvanic replacement between the etched Ag NCs and a Au precursor. Through adjustment of the etching time, the vertex and edge sites are selectively etched, resulting in the rounding of the produced Ag NCs and providing precise control over the structural parameters of CPOs. This configuration enables robust near-field focusing at the vertices, edges, and intragap region, as confirmed by both single-particle SERS measurements and theoretical simulations. Our study represents a significant advancement toward the facile yet precise synthesis of 3D complex PINs, holding great promise for applications in biosensing and optical devices.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Synthesis Of 3d Cpos By Galvanic Replacementmentioning

confidence: 99%

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3D Connected Plasmonic Octamers for Boosting Single-Particle Surface-Enhanced Raman Scattering

Cheng,

Hu,

Zhang

et al. 2024

J. Phys. Chem. C

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“…Nanotechnology is an invaluable tool with versatile applications in medicine, sensing, and biotechnology. [1][2][3] Tailoring nanoparticle interactions with their environment is a critical aspect of these applications. In biological fluids, protein adsorption to surfaces of nanomaterials is a widely known phenomenon and can pose a significant challenge.…”

Section: Introductionmentioning

confidence: 99%

Protein Binding Leads to Reduced Stability and Solvated Disorder in the Polystyrene Nanoparticle Corona

Somarathne,

Amarasekara,

Kariyawasam

et al. 2024

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Understanding the conformation of proteins in the nanoparticle corona has important implications in how organisms respond to nanoparticle‐based drugs. These proteins coat the nanoparticle surface, and their properties will influence the nanoparticle's interaction with cell targets and the immune system. While some coronas are thought to be disordered, two key unanswered questions are the degree of disorder and solvent accessibility. Here, a model is developed for protein corona disorder in polystyrene nanoparticles of varying size. For two different proteins, it is found that binding affinity decreases as nanoparticle size increases. The stoichiometry of binding, along with changes in the hydrodynamic size, supports a highly solvated, disordered protein corona anchored at a small number of attachment sites. The scaling of the stoichiometry versus nanoparticle size is consistent with disordered polymer dimensions. Moreover, it is found that proteins are destabilized less in the presence of larger nanoparticles, and hydrophobic exposure decreases at lower curvatures. The observations hold for proteins on flat polystyrene surfaces, which have the lowest hydrophobic exposure. The model provides an explanation for previous observations of increased amyloid fibrillation rates in the presence of larger nanoparticles, and it may rationalize how cell receptors can recognize protein disorder in therapeutic nanoparticles.

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“…The rational synthesis of structurally complex metal nanoparticles (NPs) is of critical importance in nanoscience because it allows for exploration of unexpected physicochemical properties and increased understanding of structure–property relationships. − One representative example is related to nanoframes (NFs), where each rim and inner empty space allow for effective interaction with the surrounding media . This has spurred considerable investigations in diverse research fields such as plasmonics − and catalysis. − For example, transition metal-based NFs such as Pt, Pd, and Ru have shown excellent catalytic activity compared to their solid or core–shell counterparts due to their high specific surface area and inner voids. − However, the structures of catalytic NFs have been limited to single-rim-based architectures, intrinsically constraining their effective surface area per occupied volume due to inner void space. Introducing additional frameworks in a single entity would increase the surface area to volume ratio and their compactness, eventually enhancing catalytic performance.…”

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confidence: 99%

Synthesis of Pt Double-Walled Nanoframes with Well-Defined and Controllable Facets

et al. 2022

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In this paper, we demonstrate the synthesis of morphologically complex nanoframes wherein a mixture of frames and thin solid planes, which we refer to as walled-nanoframes, are present in a single particle. By applying multiple chemical steps including shape evolution of Au nanocrystals and controlling chemical potential of solution for selective deposition, we successfully designed a variety of Pt nanoframes including Pt cuboctahedral nanoframes and Pt single-walled nanoframes. The rationale for on-demand chemical steps with well-faceted Au overgrowth allowed for the synthesis of double-walled nanoframes where two Pt single-walled nanoframes are concentrically overlapped in a single entity with a clearly discernible gap between the two nanoframes. Given the coexistence of an open structure of nanoframe and thin plates within one entity, the double-walled nanoframes showed a dramatic increase in catalytic activity toward the methanol oxidation reaction, acting as high-surface area, carbon-free, and volume-compact nanocatalysts.

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Direct synthesis of Au–Ag nanoframes by galvanic replacement via a continuous concaving process

Abstract: Controlled synthesis of noble-metal nanoframes is of great interest due to their promising applications in plasmonics and catalysis. However, the synthesis is largely limited to the multiple-step approach involving selective...

Cited by 11 publications

References 44 publications

3D Connected Plasmonic Octamers for Boosting Single-Particle Surface-Enhanced Raman Scattering

3D Connected Plasmonic Octamers for Boosting Single-Particle Surface-Enhanced Raman Scattering

Protein Binding Leads to Reduced Stability and Solvated Disorder in the Polystyrene Nanoparticle Corona

Synthesis of Pt Double-Walled Nanoframes with Well-Defined and Controllable Facets

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