A Novel Physical Approach for Cationic–Thiolate Protected Fluorescent Gold Nanoparticles

Ishida, Yohei; Lee, Chaiyathat; Yonezawa, Tetsu

doi:10.1038/srep15372

Cited by 18 publications

(18 citation statements)

References 36 publications

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“…Our approach to addressing this issue is based on physical method. We have developed a matrix-sputtering method 14 15 16 17 18 , which is a simple technique for preparing metal NPs without formation of by-products. This method is based on vacuum metal evaporation using a liquid matrix with a low vapour pressure.…”

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confidence: 99%

“…In our sputtering process, the mercaptan molecules dissolve in liquid matrix or evaporate in the gas phase and thus prevent the aggregation and growth of NPs by the effective coordination according to their concentrations, and result in a systematic size control in a single nanometer order. We have already reported several examples for size-controlled synthesis of gold or silver NPs with thiolate ligands 16 17 18 22 . These matrix sputtering resulted in a formation of Au NPs that fluoresce in NIR region.…”

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Thiolate–Protected Gold Nanoparticles Via Physical Approach: Unusual Structural and Photophysical Characteristics

Ishida

Akita

Sumi

et al. 2016

Sci Rep

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Here we report a novel physical approach for thiolate–protected fluorescent gold nanoparticles with a controlled size of the order of a few nanometers. This approach is based on a sputtering of gold into a liquid matrix containing thiolate ligand as a stabilizer at various concentrations, thus no reductant was used. The size of the gold nanoparticles was successfully controlled to range from 1.6 to 7.4 nm by adjusting the thiol concentrations. Surface plasmon absorption was observed in larger nanoparticles, but it was not observed in smaller ones. Such smaller nanoparticles fluoresced at around 670 nm with a small spectral shift according to their size, however, the diameter (1.6–2.7 nm) was very strange to show such red emission compared with photophysical characteristics of reported gold cluster or nanoparticles synthesized by chemical method. By detailed investigations using TEM, HAADF-STEM, XPS, and TGA, and size fractionation by size exclusion chromatography, we finally arrived at the plausible mechanism for the origin of unusual fluorescence property; the obtained gold nanoparticles are not single-crystal and are composed of aggregates of very small components such as multinuclear gold clusters or complexes.

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Thiolate–Protected Gold Nanoparticles Via Physical Approach: Unusual Structural and Photophysical Characteristics

Ishida

Akita

Sumi

et al. 2016

Sci Rep

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“…It was shown that the introduction of an additional stabilizing agent containing thiolate, amine, or carboxy groups promotes the formation of NPs of smaller size and with a more narrow size distribution than in the case of a pure host liquid [119,120,161,162,[202][203][204][205][206][207][208][209][210]. For example, Yonezawa's group demonstrated that in the case of sputtering of Ag onto pure PEG-600 (2-inch target; 50 mm distance; 2 Pa (Ar); 20 min; 10 g of PEG) the size of Ag NPs is 7.4 ± 3.6 nm.…”

Section: Additional Ligands In the Host Liquidmentioning

confidence: 99%

Sputtering onto liquids: a critical review

Sergievskaya¹,

Chauvin²,

Konstantinidis³

2022

Beilstein J. Nanotechnol.

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Sputter deposition of atoms onto liquid substrates aims at producing colloidal dispersions of small monodisperse ultrapure nanoparticles (NPs). Since sputtering onto liquids combines the advantages of the physical vapor deposition technique and classical colloidal synthesis, the review contains chapters explaining the basics of (magnetron) sputter deposition and the formation of NPs in solution. This review article covers more than 132 papers published on this topic from 1996 to September 2021 and aims at providing a critical analysis of most of the reported data; we will address the influence of the sputtering parameters (sputter power, current, voltage, sputter time, working gas pressure, and the type of sputtering plasma) and host liquid properties (composition, temperature, viscosity, and surface tension) on the NP formation as well as a detailed overview of the properties and applications of the produced NPs.

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“…Molten salt [64], vegetable oil [65,66], biomolecules [67], fatty acids [68], multifunctional group ligandcontaining liquids [69,70], polyol [71] and others have been examined as candidates for liquid sputtering to offer different surface functionality for the particles and to understand the influence of the liquid medium on particle growth. Recently, there has been great progress in particle size control on a scale from sub-nano to a few nanometres via the addition of thiol functionalized protecting agents to the liquid matrix [72][73][74][75][76][77]. Consequently, fluorescent metal NCs and NCs hybridized in polymer resins were obtained.…”

Section: Brief History and Background Of Sputtering Onto A Liquidmentioning

confidence: 99%

Sputtering onto a liquid: interesting physical preparation method for multi-metallic nanoparticles

Nguyen

Yonezawa

2018

Science and Technology of Advanced Materials

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The young history of sputtering onto a liquid features great achievements in the green production of various metal and metal oxide nanoparticles (NPs) and nanoclusters (NCs). Studies on how the sputtering parameters affect the properties of NPs and NCs have elucidated their formation mechanism and marked a crucial role of liquid matrix in the nucleation and growth of particles, controlling their various properties. Current research has been devoted to making alloy bi-and trimetallic NPs with a high level of control over the NP structure, composition, and size via well-designed target systems, sputtering steps, and liquid matrix materials. In this minireview, we discuss the recent advances in the use of various types of targets to prepare different bi-and trimetallic NPs. In single target sputtering, systems with alternative configurations of metals, alloy targets, monometallic targets in sequence, and a combination of sputtering and chemical reactions have been developed. On the other hand, a double head system was introduced to widen the range of controllable sputtering parameters yielding more versatility in particle composition and fine structure. The synergistic and tuneable properties exhibited by the multi-metallic components in small NPs and NCs for their use in catalysis and optical applications are discussed.

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A Novel Physical Approach for Cationic–Thiolate Protected Fluorescent Gold Nanoparticles

Cited by 18 publications

References 36 publications

Thiolate–Protected Gold Nanoparticles Via Physical Approach: Unusual Structural and Photophysical Characteristics

Thiolate–Protected Gold Nanoparticles Via Physical Approach: Unusual Structural and Photophysical Characteristics

Sputtering onto liquids: a critical review

Sputtering onto a liquid: interesting physical preparation method for multi-metallic nanoparticles

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