Self‐Assembled Ultra‐High Aspect Ratio Silver Nanochains

Shiers, Matthew J.; Leech, R; Carmalt, Claire J.; Parkin, Ivan P.; Kenyon, Anthony J.

doi:10.1002/adma.201202005

Cited by 17 publications

(25 citation statements)

References 61 publications

(74 reference statements)

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“…It has been widely used in biological labeling and sensing, catalysis, conductors, localized surface plasmon resonance (LSPR), and surface-enhanced Raman scattering (SERS) 1 2 3 4 5 6 . Silver nanostructures with various shapes, such as wires, chains, belts, rice, plates, prisms, bars and cubes, have been synthesized by different approaches 7 8 9 10 11 12 13 14 15 16 17 . Sophisticated structures, such as flower-like, dendritic or star-shaped hierarchical silver particles are highly desired for improved SERS applications because these structures show significant electric field enhancement at their surface 18 19 .…”

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confidence: 99%

Reversibly Switching Silver Hierarchical Structures via Reaction Kinetics

Liu

Yang

et al. 2015

Sci Rep

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Here we report a study on controllable synthesis of hierarchical silver structures via regulating reaction kinetics. Silver particles with various morphologies are synthesized by a solution-based reduction approach at the addition of amino acids. The amino acid is used to coordinate with silver ions to slow down the reduction of silver ions. With the increase of glycine concentration, the morphologies of silver particles switch from dendrites, to flowers and to compacted spheres, which is attributed to the decrease of reaction rate as a result of the coordination. Three more amino acids are examined and confirms the role of reaction kinetic in shaping silver particles. Furthermore, by increasing the concentration of the reductant, the silver morphologies change from compact spheres to loose flowers as a result of the increase of reaction rate. Therefore the silver hierarchical structure can be reversibly switched by reaction kinetics. The silver particles synthesized are tested for surface enhanced Raman scattering (SERS) property and the dendritic particles present a remarkable SERS activity. This study shows that reaction kinetics is a powerful tool to tune hierarchical structures of silver particles, which is expected to be transferable to other material systems.

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confidence: 99%

Reversibly Switching Silver Hierarchical Structures via Reaction Kinetics

Liu

Yang

et al. 2015

Sci Rep

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“…[197] High aspect ratio (large DP) colloidal polymers were obtained through non-covalent interactions of Ag-thiolate polymers (Ag(I) and tiopronin ligands) and AgNPs via an ultra-sonication approach. [198] A colloidal suspension of tiopronin-stabilized AgNPs (D = 16 nm) was dried and the solid product was redispersed in deionized water under ultrasound sonication before preparing a sample for TEM studies. Colloidal polymers consisting of smaller (D = 4 nm) colloidal monomers were obtained from sonication of larger (D = 16 nm) AgNP dispersions, [198] where the change in particle diameter was proposed to occur due to digestive ripening of larger (16 nm) precursors.…”

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confidence: 99%

“…[198] A colloidal suspension of tiopronin-stabilized AgNPs (D = 16 nm) was dried and the solid product was redispersed in deionized water under ultrasound sonication before preparing a sample for TEM studies. Colloidal polymers consisting of smaller (D = 4 nm) colloidal monomers were obtained from sonication of larger (D = 16 nm) AgNP dispersions, [198] where the change in particle diameter was proposed to occur due to digestive ripening of larger (16 nm) precursors. [199] The formation of 1-D colloidal polymers was attributed to the presence of Ag(I)-tiopronin coordination polymers, where linear NP assemblies were held together by a combination of hydrogen bonding, van der Waals forces, and argentophilic interactions.…”

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confidence: 99%

“…However, this metalthiolate mechanism for colloidal polymer formation was extended to include AuNPs by using Cu(I) and Au(I)-thiolates to form linear thiolate structures in the same report. [198] The resulting linear assemblies of both AgNPs and AuNPs based on thiolate templates spanned several microns in length, but the average DP of these colloidal polymers was not explicitly discussed.…”

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confidence: 99%

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Colloidal polymers from inorganic nanoparticle monomers

Hill

Pinna

Char

et al. 2015

Progress in Polymer Science

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The use of preformed inorganic nanoparticles as "colloidal monomers" has received recent attention for the formation of one-dimensional (1-D) mesostructures, or "colloidal polymers." These colloidal monomers form linear assemblies through attractive, directional, interparticle interactions, which are similar to covalent or supramolecular interactions in classical polymer science. However, in contrast to the high degree of structural control available in the synthesis of classical molecular polymers, methods to control fundamental structural features such as chain length (DP), composition (copolymers), and architecture (linear, branched, etc.) are still being developed for NP-based colloidal polymer systems. We therefore review the colloidal polymerization of inorganic nanoparticle monomers by applying the conceptual framework provided by polymer science to categorize these novel systems. The descriptive nomenclature used for classical polymers is applied to NP assembly to define more explicitly the types of colloidal polymers formed in terms of DP, architecture, and composition (for binary NP assemblies). This Review includes descriptions of inorganic nanoparticle types useful for the formation of colloidal polymers with examples chosen to demonstrate control over mesoscopic structure and composition. The various emergent optical, electrical and electrochemical properties from these materials are also reviewed and correlated with structural control achieved in various colloidal polymer systems.

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“…13, 15 It was found that tiopronin-protected Ag NCs have a highly sulfidized surface structure which led to their increased stability, and they also displayed potential for antibacterial applications; the role of their small Ag metal cores was found to be important in this regard. 13 Interestingly, a minor modification of the synthetic procedure allows D r a f t for slightly larger tiopronin-protected Ag NPs, with no apparent chain-like 1-D assembly..…”

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The structure and bonding properties of tiopronin-protected silver nanoparticles as studied by X-ray absorption spectroscopy

2018

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Thiolate-protected Ag nanoparticles (NPs) exhibit interesting physical and chemical properties which may lead to various sensing, diagnostic, and therapeutic applications. Further, understanding structure-property relationships of Ag NPs is of great interest in order to optimize their application. Herein, we used TEM, UV-vis, and a series of synchrotron X-ray spectroscopy techniques to probe the local structure and chemical bonding properties of thiolate-stabilized Ag NPs. Compared with other Ag nanostructures prepared under slightly modified conditions, the Ag NPs were found to have pronounced structural changes, which led to immensely different optical properties. Notably, the NPs were also found to have similar surface structure to recently elucidated Ag nanoclusters prepared with different thiolates. These findings suggest that the NP structure and optical properties can be sensitively tailored by controlling the synthetic conditions. The multi-element, multi-core excitation approach (i.e., Ag K-, Ag L 3 -, and S K-edges) employed in the X-ray absorption spectroscopy measurements was also demonstrated as an effective tool to uncover the NP structure from both the metal core and ligand shell perspectives.

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Self‐Assembled Ultra‐High Aspect Ratio Silver Nanochains

Cited by 17 publications

References 61 publications

Reversibly Switching Silver Hierarchical Structures via Reaction Kinetics

Reversibly Switching Silver Hierarchical Structures via Reaction Kinetics

Colloidal polymers from inorganic nanoparticle monomers

The structure and bonding properties of tiopronin-protected silver nanoparticles as studied by X-ray absorption spectroscopy

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