Short ligands offer long-term water stability and plasmon tunability for silver nanoparticles

Bayram, Serene S.; Zahr, Omar; Blum, Amy Szuchmacher

doi:10.1039/c4ra09667c

Cited by 26 publications

(18 citation statements)

References 34 publications

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“…Whilst high quality data relating nanoparticle size to peak position exists, 63 the peak position can be substantially shied by different particle morphologies, 65,66 surface oxide 67,68 and surface chemistry. 64,69 We ascribe the observed plasmon resonance in silver-ethanol samples to the contributions of many resonances of different particle sizes and morphologies.…”

Section: Resultsmentioning

confidence: 99%

Silver nanoparticles by atomic vapour deposition on an alcohol micro-jet

et al. 2019

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Section: Resultsmentioning

confidence: 99%

Silver nanoparticles by atomic vapour deposition on an alcohol micro-jet

et al. 2019

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“…17,27,42 Both Ag NPs also exhibited similar UV−visible spectra after long-term storage in water (see Supporting Information, Figure S1), which demonstrates their high stability and negligible aggregation, similar to previous studies of other Cys-Ag NPs and PVP-Ag NPs. 23,39 It should also be noted that despite the almost identical size for Cys-Ag and PVP-Ag NPs, their overall spectra are significantly different. Because SPR peaks are largely dependent on the surface of the NPs, the difference in spectra alludes to a very different surface structure of the two types of NPs.…”

Section: Methodsmentioning

confidence: 97%

Impact of Protecting Ligands on Surface Structure and Antibacterial Activity of Silver Nanoparticles

Padmos¹,

Boudreau

Weaver

et al. 2015

Langmuir

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Silver nanoparticles (Ag NPs) have attracted much attention in the past decade because of their unique physicochemical properties and notable antibacterial activities. In particular, thiol-protected Ag NPs have come to the forefront of metal nanoparticle studies, as they have been shown to possess high stability and interesting structure-property relationships. However, a clear correlation between thiol-protecting ligands, the resulting Ag NP surface structure, and their antibacterial properties has yet to be determined. Here, a multielement (Ag and S), multi-edge (Ag K-edge, Ag L3-edge, S K-edge) X-ray absorption spectroscopy (XAS) methodology was used to identify the structure and composition of Ag NPs protected with cysteine. XAS characterization was carried out on similar-sized Ag NPs protected with poly(vinylpyrrolidone) (PVP), in order to provide a valid comparison of the ligand effect on surface structure. The PVP-Ag NPs showed a metallic Ag surface and composition, consistent with metal NPs protected by weak protecting ligands. On the other hand, the Cys-Ag NPs exhibited a distinct surface shell of silver sulfide, which is remarkably different than previously studied Cys-Ag NPs. The minimum inhibitory concentration (MIC) of both types of Ag NPs against Gram-positive (+) and Gram-negative (-) bacteria were tested, including Staphylococcus aureus (+), Escherichia coli (-), and Pseudomonas aeruginosa (-). It was found that the MICs of the Cys-Ag NPs were significantly lower than the PVP-Ag NPs for each bacteria, implicating the influence of the sulfidized surface structure. Overall, this work shows the effect of ligand on the surface structure of Ag NPs, as well as the importance of surface structure in controlling antibacterial activity.

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“…Surfactant-mediated assembly of AgNPs requires prolonged incubation times without generating intense anisotropy [25]. Herein, we report a “green & cheap” kit for the facile and quick assembly of AgNPs into highly anisotropic structures that reveal chain-like, branched networks as well as dense aggregates mediated by hydrogen-bonding short ligands that are known to well passivate the AgNPs surface [30]. We report the substantial influence of the ligand-to-particle ratio on the aggregate configuration and its optical signal.…”

Section: Introductionmentioning

confidence: 99%

Tunable longitudinal modes in extended silver nanoparticle assemblies

Bayram

Lindfors

Blum

2016

Beilstein J. Nanotechnol.

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SummaryNanostructured materials with tunable properties are of great interest for a wide range of applications. The self-assembly of simple nanoparticle building blocks could provide an inexpensive means to achieve this goal. Here, we generate extended anisotropic silver nanoparticle assemblies in solution using controlled amounts of one of three inexpensive, widely available, and environmentally benign short ditopic ligands: cysteamine, dithiothreitol and cysteine in aqueous solution. The self-assembly of our extended structures is enforced by hydrogen bonding. Varying the ligand concentration modulates the extent and density of these unprecedented anisotropic structures. Our results show a correlation between the chain nature of the assembly and the generation of spectral anisotropy. Deuterating the ligand further enhances the anisotropic signal by triggering more compact aggregates and reveals the importance of solvent interactions in assembly size and morphology. Spectral and morphological evolutions of the AgNPs assemblies are followed via UV–visible spectroscopy and transmission electron microscopy (TEM). Spectroscopic measurements are compared to calculations of the absorption spectra of randomly assembled silver chains and aggregates based on the discrete dipole approximation. The models support the experimental findings and reveal the importance of aggregate size and shape as well as particle polarizability in the plasmon coupling between nanoparticles.

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Short ligands offer long-term water stability and plasmon tunability for silver nanoparticles

Abstract: Four short ligands; cysteine, cysteamine, dithiothrietol and glycine are examined and compared in their ability to stabilize and assemble silver nanoparticles (AgNPs).

Cited by 26 publications

References 34 publications

Silver nanoparticles by atomic vapour deposition on an alcohol micro-jet

Silver nanoparticles by atomic vapour deposition on an alcohol micro-jet

Impact of Protecting Ligands on Surface Structure and Antibacterial Activity of Silver Nanoparticles

Tunable longitudinal modes in extended silver nanoparticle assemblies

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