Facile production of monodisperse nanoparticles on a liquid surface

Anantha, P Chandrakasan; Cheng, Ting; Tay, Yee Yan; Wong, Chee Cheong; Ramanujan, R.V.

doi:10.1039/c5nr05904f

Cited by 7 publications

(4 citation statements)

References 38 publications

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“…This is, however, in direct contradiction with a number of studies that have found the sputtering time not essentially important with respect to size and distribution [39]. This can be explained by the fact that the model published by Anantha et al [38] does not reflect changes in concentration throughout the whole volume of the liquid. During deposition, the deposited material accumulates at the liquid-vacuum interface (or at a small depth below the surface).…”

Section: Metal Nanoparticles In Liquids: Preparation Fundamentalscontrasting

confidence: 61%

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Structure-Dependent Biological Response of Noble Metals: From Nanoparticles, Through Nanowires to Nanolayers

Siegel¹,

Staszek²,

Polívková³

et al. 2018

Noble and Precious Metals - Properties, Nanoscale Effects and Applications

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Noble metals in their diverse nanoforms bring revolution to many fields of science and technology, as they provide unique properties over their bulk counterparts. Thanks to these completely unprecedented properties, commercial sphere pressure is growing to use them in everyday life. Unfortunately, one of the issues that are subject to dramatic changes is the reactivity of these structures. This may have often fatal consequences to the living organisms. Due to the fact that the mechanism of action of metal nanostructures on living organisms is not yet fully elucidated even in the case of the most studied noble metals such as gold and silver, it is necessary to continue intensively in their research, characterization and categorization. The main prerequisite for the undistorted study of interactions of nanostructures with living organisms is the use of suitable methods of their preparation. Within this context, this chapter attempts to summarize current knowledge form the field of synthesis of metal nanoparticles, layers, wires, and other nanostructures, especially regarding novel techniques of their preparation and extend them by our own results in this area, in the context of their biological properties. More specifically, antibacterial efficacy and potential cytotoxicity of those structures are thoroughly addressed.

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Section: Metal Nanoparticles In Liquids: Preparation Fundamentalscontrasting

confidence: 61%

“…A more detailed view into the formation mechanism of NPs was provided by Anantha et al [38]. They describe the process of preparing uniform NPs using a so-called shared coarsening model.…”

Section: Metal Nanoparticles In Liquids: Preparation Fundamentalsmentioning

confidence: 99%

Structure-Dependent Biological Response of Noble Metals: From Nanoparticles, Through Nanowires to Nanolayers

Siegel¹,

Staszek²,

Polívková³

et al. 2018

Noble and Precious Metals - Properties, Nanoscale Effects and Applications

View full text Add to dashboard Cite

show abstract

“…Besides chemical syntheses, there have been reports recently of successful preparation of metal nanoparticles and related composites via physical vapor deposition (PVD) onto liquids with very low vapor pressures, such as silicone oils, − vegetable oils, poly(ethylene glycol), , liquid crystals, and room temperature ionic liquids (RTILs), − in which small clusters or atoms ejected from bulk metals were trapped on the liquid surface and then formed islandlike aggregates of metal particles on the liquid surface or nanoparticles uniformly dispersed in the bulk liquid phase. RTILs are particularly useful for the synthesis of nanoparticles with well-controlled sizes and shapes, because of their extremely low vapor pressure and their capabilities to dissolve many kinds of substances and to uniformly disperse a variety of solid nanoparticles.…”

Section: Introductionmentioning

confidence: 99%

Formation of a Pt-Decorated Au Nanoparticle Monolayer Floating on an Ionic Liquid by the Ionic Liquid/Metal Sputtering Method and Tunable Electrocatalytic Activities of the Resulting Monolayer

Sugioka

Kameyama

Kuwabata

et al. 2016

ACS Appl. Mater. Interfaces

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A novel strategy to prepare a bimetallic Au-Pt particle film was developed through sequential sputter deposition of Au and Pt on a room temperature ionic liquid (RTIL). Au sputter deposition onto an RTIL containing hydroxyl-functionalized cations produced a monolayer of Au particles 4.2 nm in size on the liquid surface. Subsequent Pt sputtering onto the original Au particle monolayer floating on the RTIL enabled decoration of individual Au particles with Pt metals, resulting in the formation of a bimetallic Au-Pt particle monolayer with a Pt-enriched particle surface. The particle size slightly increased to 4.8 nm with Pt deposition for 120 min. The shell layer of a bimetallic particle was composed of Au-Pt alloy, the composition of which was tunable by controlling the Pt sputter deposition time. The electrochemical surface area (ECSA) was determined by cyclic voltammetry of bimetallic Au-Pt particle monolayers transferred onto HOPG electrodes by a horizontal liftoff method. The Pt surface coverage, determined by ECSAs of Au and Pt, increased from 0 to 56 mol % with elapse of the Pt sputter deposition time up to 120 min. Thus-obtained Au-Pt particle films exhibited electrocatalytic activity for methanol oxidation reaction (MOR) superior to the activities of pure Au or Pt particles. Volcano-type dependence was observed between the MOR activity and Pt surface coverage on the particles. Maximum activity was obtained for Au-Pt particles with a Pt coverage of 49 mol %, being ca. 120 times higher than that of pure Pt particles. This method enables direct decoration of metal particles with different noble metal atoms, providing a novel strategy to develop highly efficient multinary particle catalysts.

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“…Superiority of electrolytic spray (direct ionization of noble metals from the corresponsing electrodes by electrochemical corrosion) and electrospray (ionization of metal ions from its precursor salts) to make metal NPs over previous methods − lies in the fact that they do not involve any components other than the metal precursors. This ambient and direct method of synthesis is less expensive in comparison to processes like physical vapor deposition (PVD) (used for synthesis of metal NPs) , as no sophisticated instrumentation is used. Most important advantage of this method is that it can be performed at room temperature in air.…”

Section: Introductionmentioning

confidence: 99%

Electrohydrodynamic Assembly of Ambient Ion-Derived Nanoparticles to Nanosheets at Liquid Surfaces

et al. 2018

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We describe an ambient ion-based method to create free-standing metal nanosheets, which in turn are composed of nanoparticles of the corresponding metal. These nanoparticle-nanosheets (NP-NSs) were formed by the electrospray deposition (ESD) of metal ions on a liquid–air interface leading to nanoparticles that self-organize under the influence of electrohydrodynamic flows, driven by the electric field induced by the applied potential. Such a two-dimensional organization of noble metals is similar to the assembly of molecules at liquid–air interface and has the possibility of creating a category of new materials useful for diverse applications. Enhanced catalytic activity of the formed NP-NSs for Suzuki–Miyaura coupling reaction was demonstrated, which was attributed to their large surface-to-volume ratios.

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Facile production of monodisperse nanoparticles on a liquid surface

Cited by 7 publications

References 38 publications

Structure-Dependent Biological Response of Noble Metals: From Nanoparticles, Through Nanowires to Nanolayers

Structure-Dependent Biological Response of Noble Metals: From Nanoparticles, Through Nanowires to Nanolayers

Formation of a Pt-Decorated Au Nanoparticle Monolayer Floating on an Ionic Liquid by the Ionic Liquid/Metal Sputtering Method and Tunable Electrocatalytic Activities of the Resulting Monolayer

Electrohydrodynamic Assembly of Ambient Ion-Derived Nanoparticles to Nanosheets at Liquid Surfaces

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