Microwave-assisted polyol synthesis of copper nanocrystals without using additional protective agents

Kawasaki, Hideya; Kosaka, Yuka; Myoujin, Yuki; Narushima, Tetsuya; Yonezawa, Tetsu; Arakawa, Ryuichi

doi:10.1039/c1cc12346g

Cited by 156 publications

(107 citation statements)

References 27 publications

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“…However, compared to the extensive studies on gold and silver, reports on copper nanoclusters are still scarce primarily because of their susceptibility to oxidation and the difficulty in preparing extremely tiny particles. Recently, several methods have been successfully developed to synthesize tiny copper nanoclusters and monolayer-protected clusters with unique optical and catalytic properties [9][10][11][12][13][14]. In this review, we will initially focus on the synthesis techniques that have been used for copper nanocluster preparation such as template-based syntheses, electrochemical methods, water-in-oil (w/o) microemulsion techniques, the typical Brust-Schiffrin method and microwave-assisted polyol synthesis.…”

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confidence: 99%

Copper nanoclusters: Synthesis, characterization and properties

2012

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Metal nanoclusters with a core size smaller than 2 nm have attracted much attention because of their unique physical and chemical properties. Among the studied metal nanoclusters, gold and silver have been studied extensively by size-controlled synthesis, structural characterization and properties investigations. Recently, considerable research effort has been devoted to the investigation of copper nanoclusters. In this review, we highlight recent progress in the study of copper nanoclusters in terms of synthesis methods, characterization techniques and their novel optical and catalytic properties. copper, nanoclusters, fluorescence, electrocatalyst, nanomaterials, synthesis Citation: Metal nanoclusters have attracted considerable attention because of their unique size-dependent properties such as photoluminescence [1], intrinsic magnetism [2], electrochemical characteristics [3], chirality [4] and catalysis [5], which deviate significantly from those of their corresponding bulk metals and large nanoparticles. Metal nanoclusters with a core size comparable to the Fermi wavelength of an electron bridge the gap between molecules and nanoparticles. In the past decade, noble metal nanoclusters (mainly Au and Ag) have been extensively synthesized and studied using alkanethiols and other ligands as protecting agents by taking advantage of the strong affinity of thiol, amido or phosphine groups to noble metal surfaces and their excellent stability in different media [6][7][8]. Copper is widely used in industry because of its high conductivity, similar properties to gold and silver and much lower cost. However, compared to the extensive studies on gold and silver, reports on copper nanoclusters are still scarce primarily because of their susceptibility to oxidation and the difficulty in preparing extremely tiny particles. Recently, several methods have been successfully developed to synthesize tiny copper nanoclusters and monolayer-protected clusters with unique optical and catalytic properties [9][10][11][12][13][14]. In this review, we will initially focus on the synthesis techniques that have been used for copper nanocluster preparation such as template-based syntheses, electrochemical methods, water-in-oil (w/o) microemulsion techniques, the typical Brust-Schiffrin method and microwave-assisted polyol synthesis. We then summarize the often used techniques for the structural and optical characterizations of copper nanoclusters such as UV-Vis spectroscopy, transmission electron microscopy (TEM) and high-resolution TEM techniques, powder X-ray diffraction analysis, X-ray photoelectron spectroscopy, FT-IR measurements, energy dispersive X-ray (EDX) analysis and mass spectrometry etc. We also discuss the properties of copper nanoclusters that have recently been discovered. Finally, we give some concluding remarks and the outlook for research into copper nanoclusters in the near future.

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confidence: 99%

Copper nanoclusters: Synthesis, characterization and properties

2012

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“…Данный способ позволяет получать наночасти-цы металлов (или оксидов металлов) с низким распределением разме-ров и контролируемой морфологией. В качестве неорганических предшественников наночастиц меди используют ацетат меди Cu(CH 3 COO) 2 Важную роль в качестве восстанавливающего агента соли меди играет избыток аскорбиновой кислоты [21][22][23] (возможно использова-ние гидроксида натрия [16,24] или боргидрида натрия [10]), предот-вращающий окисление наночастиц меди [25][26][27]. Антиокислительные свойства аскорбиновой кислоты проявляются благодаря способности присоединять свободные радикалы с помощью электронного пожертво-вания по донорно-акцепторному механизму:…”

Section: химические методы подготовки медиunclassified

“…Успешные результаты метода полиолов проявляются под действи-ем СВЧ-излучения [25,[30][31][32]. Волновая энергия применяется для нагрева компонентов при растворении агентов и смешении конечного раствора [33].…”

Section: химические методы подготовки медиunclassified

The influence of metal nanoparticles on the mechanical properties of composite materials

Каримов¹,

Каримов²,

Мовсумзаде³

et al. 2017

Nanotehnol. stroit.

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ExtEndEd AbstrAct:The article presents the results of studies on changes in mechanical and physical properties of polymeric construction materials after the introduction of metal nanoparticles. As an example of metal nanoparticles the influence of nanoparticles of copper has been considered. The ways of formation of copper with dimensions of nanometers, a brief methodology and structure of the obtained filler are shown. Copper nanoparticles have unique anti-bacterial, thermal and conductive properties. These properties substantially remain in the polymer material. The resulting composite material has technological properties of polymers and unique physical properties of the filler.Polymer material was selected among the products of large-tonnage production: polyvinyl chloride, elastomers, polyethylene, polypropylene, polystyrene. The selection of copper ions from the nanoparticles depends on the type of stabilizing agent and on the chemical nature of the environment. The performance of antimicrobial properties in polymer materials is achieved by the dosage of copper in the amount of 1-2% by weight. To give a material the conductive properties of copper nanoparticles a higher concentration of metal is required. To use only

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“…The alkaline EG synthetic method has been also applied for synthesizing bimetallic nanoparticles such as those of Pt/Ru and Pt/ Rh [48,49] . Kawasaki et al have reported the synthesis of fluorescent Cu nanoparticles about 2 nm in size via a microwaveassisted alkaline polyol synthesis method using NaOH [50] . This method did not require any additional protective or reducing agents.…”

Section: Ethylene Glycol (Eg)-mediated Synthesismentioning

confidence: 99%

Surfactant-free solution-based synthesis of metallic nanoparticles toward efficient use of the nanoparticles’ surfaces and their application in catalysis and chemo-/biosensing

Kawasaki

2013

Nanotechnology Reviews

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Abstract:The choice of stabilizer and the stabilizer-toprecursor ions molar ratio during metal nanoparticle synthesis are important for controlling the shape, size, and dispersion stability of the nanoparticles. However, the active sites on the nanoparticles surfaces may be blocked by the stabilizing agents used, resulting in a less-than-effective utilization of the surfaces. In this review, various surfactant-free solution-based methods of synthesizing metal nanoparticles are described, along with the applications of such nanoparticles in catalysis and sensing. " Surfactant-free " synthesis does not imply truly bare metal nanoparticles synthesis but implies one where the metal nanoparticles are prepared in the absence of additional stabilizing agents such as thiolate and phosphine compounds, surfactants, and polymers. These metal nanoparticles are stabilized by the solvents or the simple ions of the reducing agents or low-molecular-weight salts used. Surfactant-free synthesis of metal nanoparticles via photochemical-, ultrasonochemical-, and laser ablation-mediated synthesis methods is also described. Because of the effective utilization of their surfaces, metal nanoparticles prepared without surfactants, polymers, templates, or seeds are expected to exhibit high performance when used in catalysis (synthetic catalysis and electrocatalysis) and sensing (surface-enhanced Raman scattering (SERS)), surfaceassisted laser desorption/ionization-mass spectrometry (SALDI-MS)).

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Microwave-assisted polyol synthesis of copper nanocrystals without using additional protective agents

Abstract: We report the synthesis of 2 nm copper nanocrystals (Cu NCs) via a microwave-assisted polyol method without using additional protective and reducing agents. The Cu NCs are oxidation resistant and exhibit photoluminescence and highly stable properties in a colloidal dispersion.

Cited by 156 publications

References 27 publications

Copper nanoclusters: Synthesis, characterization and properties

Copper nanoclusters: Synthesis, characterization and properties

The influence of metal nanoparticles on the mechanical properties of composite materials

Surfactant-free solution-based synthesis of metallic nanoparticles toward efficient use of the nanoparticles’ surfaces and their application in catalysis and chemo-/biosensing

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