AuxAg1–x Nanocomposites with 40-Fold Emission Enhancement Formed by the Electrostatic Assembly of Gold Nanoclusters and Silver Nanoclusters for Bioimaging and Bioanalysis

Yin, Miaomiao; Chen, Wenqi; Liu, Fangmeng; Jiang, Feng-Lei

doi:10.1021/acsanm.8b01977

Cited by 26 publications

(21 citation statements)

References 64 publications

(97 reference statements)

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“…ment to existed metal NC-based AIE systems [6][7][8][9][10][11][12][13][14] and metal NC-based gels. [21][22][23][24][25][26] The MOGs are formed solely by Ag 9 NCs without the assistance of any organic gelator, indicating a high content of the metal NCs in MOGs.…”

Section: Methodsmentioning

confidence: 99%

“…Recently it was found that some metal NCs underwent aggregation-induced emission (AIE), [4] a phenomenon first discovered in organic molecule with a propeller-like structure. [5] Typical AIE examples include Au, [6] Ag, [7][8][9][10][11][12] Cu [13] NCs and some hybrids, [14] which greatly enriched the system of AIE. Besides, new photoluminescent (PL) properties have been distinguished, such as the fluorescence-to-phosphorescence (F-P) switching.…”

mentioning

confidence: 99%

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Metal–Organic Gels from Silver Nanoclusters with Aggregation‐Induced Emission and Fluorescence‐to‐Phosphorescence Switching

et al. 2019

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Luminescent metal nanoclusters (NCs) are emerging as a new class of functional materials that have rich physicochemical properties and wide potential applications. In recent years, it has been found that some metal NCs undergo aggregation‐induced emission (AIE) and an interesting fluorescence‐to‐phosphorescence (F‐P) switching in solutions. However, insights of both the AIE and the F‐P switching remain largely unknown. Now, gelation of water soluble, atomically precise Ag9 NCs is achieved by the addition of antisolvent. Self‐assembly of Ag9 NCs into entangled fibers was confirmed, during which AIE was observed together with an F‐P switching occurring within a narrow time scale. Structural evaluation indicates the fibers are highly ordered. The self‐assembly of Ag9 NCs and their photoluminescent property are thermally reversible, making the metal–organic gels good candidates for luminescent ratiometric thermometers.

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Section: Methodsmentioning

confidence: 99%

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confidence: 99%

Metal–Organic Gels from Silver Nanoclusters with Aggregation‐Induced Emission and Fluorescence‐to‐Phosphorescence Switching

et al. 2019

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“…29 Some typical AIE examples include Au, 30 Ag, 31,32 and Cu nanocrystals 33 and their hybrids. 34 The reported AIE from the coordinated metal nanocrystals was carried out in either dilute aqueous solution or organic solvent. 35 In 2017, the aggregation-induced electrochemiluminescence was reported for the first time in a pyridine-containing Pt(II) complex system.…”

mentioning

confidence: 99%

A Host–Guest Interaction-Based and Metal–Organic Gel-Based Biosensor with Aggregation-Induced Electrochemiluminescence Enhancement for Methyltransferase Assay

Cui

Zhao

et al. 2021

Anal. Chem.

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Metal−organic gels (MOGs) are new soft materials with the characteristics of high colloidal stability, superb luminescence properties, and facile synthesis. Herein, we develop for the first time a host−guest interaction-based and MOG-based biosensor with aggregation-induced electrochemiluminescence (ECL) enhancement for M.SssI methyltransferase (M.SssI MTase) assay. This biosensor employs a MOG as the luminophor and potassium persulfate as the coreactant, and the formation of the Ag-MOG from the aggregation of silver nanoclusters can induce significant ECL enhancement. Two complementary single-stranded DNAs (ssDNAs, i.e., biotinylated DNA-1 and Fc-labeled DNA-2) that contain specific recognition sequence 5′-CCGG-3′ can form a double-stranded DNA (dsDNA) probe. In the absence of M.SssI MTase, the dsDNA probe will be digested by restriction endonuclease HpaII, leading to the release of Fc from magnetic beads (MBs). The β-CD can specifically recognize the released Fc through guest−host interaction, resulting in the quenching of an ECL signal. In contrast, the presence of M.SssI MTase enables the formation of fully methylated dsDNA, which cannot be cleaved by HpaII, making Fc remain on the MB surface and consequently generating an improved ECL signal. This biosensor can specifically detect M.SssI MTase with a linear range of 0.05−100 U mL −1 and a limit of detection of 3.5 × 10 −3 U mL −1 , and it enables accurate detection of M.SssI MTase in human serum. In addition, it can be used for inhibitor screening, with wide applications in drug discovery and disease diagnosis.

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“…Functional nanomaterials are drawing the attention of different scientific communities due to their unique mechanical, magnetic, electrical, and optical properties, which cannot be found in most of the corresponding bulk materials . In this scenario, noble metallic nanostructures are intensively investigated for a wide range of applications such as electronics, catalysis, photonics, sensing and biomedicine .…”

Section: Introductionmentioning

confidence: 99%

Bio‐Assisted Tailored Synthesis of Plasmonic Silver Nanorings and Site‐Selective Deposition on Graphene Arrays

Giovannini

Ardini

Maccaferri

et al. 2019

Advanced Optical Materials

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The spontaneous interaction between noble metals and biological scaffolds enables simple and cost‐effective synthesis of nanomaterials with unique features. Here, plasmonic silver nanorings are synthesized on a ring‐like protein, i.e., a peroxiredoxin (PRX), and used to assemble large arrays of functional nanostructures. The PRX drives the seeding growth of metal silver under wet reducing conditions, yielding nanorings with outer and inner diameters down to 28 and 3 nm, respectively. The obtained hybrid nanostructures are selectively deposited onto a solid‐state 2D membrane made of graphene in order to prepare plasmonic nanopores. In particular, the interaction between the graphene and the PRX allows for the simple preparation of ordered arrays of plasmonic nanorings on a 2D‐material membrane. This fabrication process can be finalized by drilling a nanometer scale pore in the middle of the ring. Fluorescence spectroscopic measurements in combination with numerical simulations demonstrate the plasmonic effects induced in the metallic nanoring cavity. The prepared nanopores represent one of the first examples of hybrid plasmonic nanopore structures integrated on a 2D‐material membrane. The diameter of the nanopore and the atomically thick substrate make this proof‐of‐concept approach particularly interesting for nanopore‐based technologies and applications such as next‐generation sequencing and single‐molecule detection.

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Au_xAg_1–x Nanocomposites with 40-Fold Emission Enhancement Formed by the Electrostatic Assembly of Gold Nanoclusters and Silver Nanoclusters for Bioimaging and Bioanalysis

Cited by 26 publications

References 64 publications

Metal–Organic Gels from Silver Nanoclusters with Aggregation‐Induced Emission and Fluorescence‐to‐Phosphorescence Switching

Metal–Organic Gels from Silver Nanoclusters with Aggregation‐Induced Emission and Fluorescence‐to‐Phosphorescence Switching

A Host–Guest Interaction-Based and Metal–Organic Gel-Based Biosensor with Aggregation-Induced Electrochemiluminescence Enhancement for Methyltransferase Assay

Bio‐Assisted Tailored Synthesis of Plasmonic Silver Nanorings and Site‐Selective Deposition on Graphene Arrays

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