Synthesis and Characterization of Colloidal Fluorescent Silver Nanoclusters

Huang, Sheng Jean; Pfeiffer, Christian; Hollmann, Jana; Friede, Sebastian; Chen, Justin Jin-Ching; Beyer, Andreas; Haas, Benedikt; Volz, Kerstin; Heimbrodt, W.; Martos, Jose Maria Montenegro; Chang, Walter; Parak, Wolfgang J.

doi:10.1021/la300346t

Cited by 54 publications

(32 citation statements)

References 74 publications

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“…We can broadly classify luminescent Ag NCs that have been successfully synthesized into two types: (1) macromoleculeprotected luminescent Ag NCs (for example, polymers, [37][38][39] dendrimers, 40 DNA [41][42][43] and proteins 44,45 ) and (2) thiol-protected luminescent Ag NCs. [46][47][48][49][50][51][52] Among the luminescent Ag NCs, thiolprotected Ag NCs are more attractive for biomedical applications, especially for subcellular imaging, because of their ultrasmall hydrodynamic diameters (o3 nm), facile post-functionalization and good stability. Thiol-protected Ag NCs are generally synthesized by the etching or decomposition method by making use of the unique thiol-Ag interaction, where large-sized non-luminescent nanocrystals or NCs are etched by thiol ligands to smaller-sized luminescent NCs with a well-defined structure.…”

Section: Introductionmentioning

confidence: 99%

Highly luminescent silver nanoclusters with tunable emissions: cyclic reduction–decomposition synthesis and antimicrobial properties

et al. 2013

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This paper reports a facile aqueous-based synthesis method for highly luminescent Ag nanoclusters (NCs) with tunable emissions. The key strategy was to use a reduction-decomposition-reduction cycle to modify the Ag NC intermediates that were further subjected to size/structure focusing. The as-modified Ag NC intermediates were more robust in water against the subsequent etching by thiol ligands, making a mild size-/structure-focusing environment possible, which produced highly luminescent Ag NCs with a well-defined size and structure. Ag NCs with intense red and green emission were successfully synthesized by this method. These Ag NCs possessed a well-defined size and structure (Ag 16 (SG) 9 and Ag 9 (SG) 6 ), and exhibited excellent stability in the aqueous phase. Our highly luminescent Ag NCs also possessed superior antimicrobial properties against the multidrug-resistant bacteria Pseudomonas aeruginosa, via generating a high concentration of intracellular reactive oxygen species. Keywords: antimicrobial; biomedical applications; luminescence; silver nanoclusters; thiol ligands INTRODUCTION Ultrasmall noble metal nanoclusters (NCs), typically composed of several to a hundred metal atoms, present unique physical and chemical properties between single atoms and large nanocrystals (42 nm). [1][2][3][4] Owing to the strong quantum size confinement in this size range (o 2 nm), NCs possess discrete and size-tunable electronic transitions and display unique molecule-like properties, such as quantized charging and luminescence. [5][6][7][8][9][10][11][12] Strong luminescence is one of the most attractive features of these NCs owing to their ultrafine size, good photostability and low toxicity; 13 some of these properties may not be realized by other luminophores, such as organic dyes (for example, photostability concerns) and semiconductor quantum dots (for example, relatively large size and toxicity concerns). 2,8,9,14,15 Recent studies have shown that luminescent Au and Ag NCs are promising optical probes for bioimaging and biosensing applications. 4,[16][17][18][19][20] This finding has led to the development of various methods for the synthesis of highly luminescent Au and Ag NCs. 2,21 On the other hand, insofar as nanostructured Ag-based materials are concerned, they are finding an increasing usage for antimicrobial applications owing to the unique chemistry of Ag interfacing with microorganisms. [22][23][24] Although there is a large volume of work exploring the potential use of large Ag

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Section: Introductionmentioning

confidence: 99%

Highly luminescent silver nanoclusters with tunable emissions: cyclic reduction–decomposition synthesis and antimicrobial properties

et al. 2013

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“…The absorbance maximum for the AgNCs appears at 360 nm. Such damping of surface plasmon absorption with a corresponding weak and broadened absorption is a characteristic of nanoclusters with a size of around 2 nm . The absence of a band at around 400 nm, which is a characteristic surface plasmon resonance band of silver nanoparticles, indicates the formation of the nanocluster .…”

Section: Resultsmentioning

confidence: 99%

Role of Silver Nanoclusters in the Enhanced Photocatalytic Activity of Cerium Oxide Nanoparticles

et al. 2018

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We have designed a silver-nanocluster-supported cerium oxide nanoparticle composite (AgNC/CeO 2 ) to overcome the inapplicability of CeO 2 as a photocatalyst due to a large band gap. A hydrothermal-based synthetic strategy was followed to prepare spherical cerium oxide nanoparticles (CeO 2 NPs). The AgNCs were synthesized separately. In the final step, silver-nanocluster-supported CeO 2 nanoparticle composites were fabricated by simply mixing CeO 2 and various concentrations of AgNC and stirring for 48 hours. The as-prepared AgNC/ CeO 2 nanocomposites were employed as photocatalysts to

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“…Now for hollow Au nanoparticles the shell layer thickness is $10-12 nm and the shell layer is formed by the deposition of 5-7 nm sized Au particles, whereas in case of hollow Ag/Au nanoparticles the individual shell layer thickness is near to 2 nm. In previous literatures it was observed that small sized Au and Ag nanoparticles are highly active to absorb and emit light [37][38][39], so these small size particles show strong SPR, and the fluorescence bands for Au and Ag nanoparticles are in the visible and NIR regions, respectively. Finally, the hollow Ag/Au nanoparticles show the cumulative optical effect of both Au and Ag with increased intensities of absorbed and emitted lights.…”

Section: Optical Properties Of Hollow Au and Hollow Bi-metallic Nanopmentioning

confidence: 99%

Au and Ag/Au double-shells hollow nanoparticles with improved near infrared surface plasmon and photoluminescence properties

Chaudhuri

Paria

2016

Journal of Colloid and Interface Science

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Synthesis and Characterization of Colloidal Fluorescent Silver Nanoclusters

Abstract: Ultrasmall water-soluble silver nanoclusters are synthesized, and their properties are investigated. The silver nanoclusters have high colloidal stability and show fluorescence in the red. This demonstrates that like gold nanoclusters also silver nanoclusters can be fluorescent.

Cited by 54 publications

References 74 publications

Highly luminescent silver nanoclusters with tunable emissions: cyclic reduction–decomposition synthesis and antimicrobial properties

Highly luminescent silver nanoclusters with tunable emissions: cyclic reduction–decomposition synthesis and antimicrobial properties

Role of Silver Nanoclusters in the Enhanced Photocatalytic Activity of Cerium Oxide Nanoparticles

Au and Ag/Au double-shells hollow nanoparticles with improved near infrared surface plasmon and photoluminescence properties

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