Highly Fluorescent Noble-Metal Quantum Dots

Zheng, Jie; Nicovich, Philip R.; Dickson, Robert M.

doi:10.1146/annurev.physchem.58.032806.104546

Cited by 1,220 publications

(1,158 citation statements)

References 92 publications

(194 reference statements)

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“…One may see that along with the solution concentration increase, the peaks' position slightly shifts to the long-wave region that is connected with the size increase of Ag NPs. 23,24 These results coincide with the earlier conclusion about the dependence of NPs' size upon the concentration of the used solution.…”

Section: Resultssupporting

confidence: 91%

Direct Laser Synthesis of Ag Nanoparticles from Ammonia-alcoholic Solutions of AgNO3

Михайлов¹,

Evich²,

A³

2016

ACSi

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Ag nanoparticles were synthesized as a result of irradiation of ammonia-alcoholic solution of AgNO 3 with focused beam of Nd:YAG laser. The synthesized nanoparticles were characterized with SEM and EDX analysis, dynamic light scattering technique, absorption and luminescence spectroscopies. The average size of synthesized nanoparticles which is from 25 to 100 nm demonstrates a linear dependence on molar concentration of the used solution. Optical and luminescence properties of obtained Ag nanoparticles were demonstrated.

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Section: Resultssupporting

confidence: 91%

Direct Laser Synthesis of Ag Nanoparticles from Ammonia-alcoholic Solutions of AgNO3

Михайлов¹,

Evich²,

A³

2016

ACSi

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“…1,2 They are receiving 29 increasing interest because of their significantly different optical, electrical and chemical 30 properties compared to their larger counterparts. 3 For ultrasmall nanoclusters, the continuous 31 density of states breaks up into discrete energy levels leading to molecule-like properties such 32 as strong fluorescence.…”

Section: Metal Nanoclusters Encompass a New Class Of Luminescent Nanomentioning

confidence: 99%

Direct Laser Writing of Photostable Fluorescent Silver Nanoclusters in Polymer Films

et al. 2014

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11Metal nanoclusters consist of a few to few hundreds of atoms, and exhibit attractive molecular 12 properties such as ultrasmall size, discrete energy levels and strong fluorescence. Although 13 patterning of these clusters down to the microscale or nanoscale could lead to 14 applications such as high-density data storage, it has been reported only for inorganic 15matrices. Here we demonstrate the first submicron-scale mask-free patterning of fluorescent 16 silver nanoclusters in an organic matrix. The nanoclusters were produced by direct 17 laser writing in poly(methacrylic acid) thin films, and exhibit a broadband emission at visible 18 wavelengths with photostability that is superior to Rhodamine 6G dye. This fabrication 19 method could open new opportunities for applications in nanophotonics like imaging, 20 labeling, and metal ion sensing. We foresee that this method can be further applied to prepare 21 other metal nanoclusters embedded in compositionally different polymer matrices. 22 KEYWORDS 24Optical lithography, metal nanoclusters, photoluminescence, photobleaching, photostability, 25 polymer 26

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“…For example, when the size of such NPs is reduced to below 2 nm and each particle contains only a handful of atoms, their plasmonic properties disappear. At the same time, metal atoms might organize into well-defined structures (so called nanoclusters or NCs), forming molecular energy levels to produce strong fluorescence emission [11]. Few-atom fluorescent Au and AgNCs have been known for a long time.…”

Section: Introductionmentioning

confidence: 99%

DNA-stabilized, fluorescent, metal nanoclusters for biosensor development

Liu

2014

TrAC Trends in Analytical Chemistry

197

141

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In the past decade, fluorescent silver, gold and copper nanoclusters (Ag, Au and CuNCs) have emerged as a new class of signaling moiety for biosensor development. Compared to semiconductor quantum dots, metal NCs have less toxicity concerns and can be more easily conjugated to biopolymers. Due to their extremely small size, these NCs need a stabilizing ligand. Many polymers, proteins and nucleic acids have been reported to stabilize NCs. In particular, many DNA sequences produce highly fluorescence NCs. Coupling these DNA stabilizers with other sequences such as aptamers has generated a large number of biosensors. In this review, the synthesis of DNA and nucleotide-templated NCs is first summarized; their chemical interactions are also discussed. In the second part, the properties of NCs such as fluorescence quantum yield, emission wavelength and lifetime, structure and photostability are briefly reviewed. In the last part, various sensor design strategies using these NCs are categorized into the following four classes: 1) fluorescence de-quenching; 2) generation of templating DNA sequences to produce NCs; 3) change of nearby environment; and 4) reacting with heavy metal ions or other quenchers. Finally, the future trends in this field are discussed.

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Highly Fluorescent Noble-Metal Quantum Dots

Cited by 1,220 publications

References 92 publications

Direct Laser Synthesis of Ag Nanoparticles from Ammonia-alcoholic Solutions of AgNO3

Direct Laser Synthesis of Ag Nanoparticles from Ammonia-alcoholic Solutions of AgNO3

Direct Laser Writing of Photostable Fluorescent Silver Nanoclusters in Polymer Films

DNA-stabilized, fluorescent, metal nanoclusters for biosensor development

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