Polyelectrolyte-Templated Synthesis of Bimetallic Nanoparticles

Hsu, Su Wen; On, Kathy; Gao, Bo; Tao, Andrea R.

doi:10.1021/la2014122

Cited by 16 publications

(15 citation statements)

References 24 publications

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“…Previously, researchers have synthesized 859 multicomponent nanoparticles using several methods, including colloidal synthesis in the presence of reducing and capping agents, microemulsion templated synthesis, and microwaveassisted synthesis (Grouchko et al 2009;Blosi et al 2010;Magno et al 2010;Hsu et al 2011). The colloidal synthesis approaches are effective in controlling the shape and size of nanoparticles.…”

Section: Introductionmentioning

confidence: 99%

Creating Conductive Copper–Silver Bimetallic Nanostructured Coatings Using a High Temperature Reducing Jet Aerosol Reactor

Sharma

Buchner

Scharmach³

et al. 2013

Aerosol Science and Technology

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We report production of bimetallic nanostructured coppersilver coatings by in situ deposition and sintering of metal nanoparticles produced as an aerosol. The metal nanoparticles themselves have potential applications in printed electronics, catalysis, antibacterial coatings, and heat transfer fluids. In many applications, nanoparticles are dispersed in an ink, which is then printed or coated onto a substrate and converted into a nanostructured thin film. Direct deposition from the aerosol allows us to produce nanostructured thin films without first dispersing the particles in a solvent. The high temperature reducing jet process allows formation of these metal nanoparticles from low-cost metal salt precursors in the gas phase. In this method, a fuel-rich hydrogen flame provides a low-cost source of energy to drive nanoparticle formation in a reducing environment. The aqueous precursor solution is delivered into the hot combustion product gases within a converging-diverging nozzle. The high-speed gas flow atomizes the precursor and provides exceptionally rapid mixing of the precursor with the hot gases. Here, particles are formed, then immediately quenched and deposited on a glass substrate. The effect of the silver content of the mixed copper-silver films on their electrical conductivity was studied systematically, revealing an abrupt transition from low conductivity to high conductivity between 30 wt.% and 40 wt.% silver.

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Section: Introductionmentioning

confidence: 99%

Creating Conductive Copper–Silver Bimetallic Nanostructured Coatings Using a High Temperature Reducing Jet Aerosol Reactor

Sharma

Buchner

Scharmach³

et al. 2013

Aerosol Science and Technology

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“…The electrostatic repulsion induces random assembly of the individual nanoparticles, thereby resulting in the formation of a flowerlike nanostructure. It has been demonstrated recently that the repulsive interaction favors the growth of a flowerlike nanostructure 42…”

Section: Resultsmentioning

confidence: 61%

“…It has been demonstrated recently that the repulsive interaction favors the growth of a flowerlike nanostructure. [42] Development of Voltammetric and Impedimetric Sensors Scheme 1 illustrates the strategy used for the sensing of heparin and protamine by using the functionalized Au nanostructures. The sensors were developed by self-assembling the nanostructures onto the thiol groups of MPTS sol-gel 3D network (Scheme S1 in the Supporting Information).…”

Section: Synthesis and Characterization Of Functionalized Au Nanopartmentioning

confidence: 99%

Polyelectrolyte‐Functionalized Gold Nanoparticle Scaffold for the Sensing of Heparin and Protamine in Serum

Dey

Raj

2011

Chemistry An Asian Journal

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We describe a shape-controlled synthesis of polyelectrolyte-functionalized flowerlike and polyhedral Au nanoparticles and the development of a nanoarchitectured platform for the selective and highly sensitive detection of protamine and heparin by voltammetric, impedimetric, and microgravimetric techniques. The functionalized Au nanoparticles were chemically synthesized in aqueous solution at room temperature in the presence of the polyelectrolyte (either protamine or heparin). The charge on the polyelectrolyte controlled the shape and surface morphology of the nanoparticles. The negatively charged heparin-functionalized Au nanoparticles have multiple branched flowerlike shapes with an average size of 50 nm, whereas the cationic protamine-functionalized nanoparticles are of polyhedral shape with an average size of 25 nm. Both flowerlike and polyhedral nanoparticles have (111), (200), (220), and (311) planes of a face-centered cubic lattice of Au. Voltammetric, impedimetric, and microgravimetric sensing platforms based on functionalized Au nanoparticles have been developed for the sensing of heparin and protamine. The sensing platforms are developed by self-assembling the functionalized nanoparticles on a thiol-functionalized three-dimensional silicate network. The microgravimetric sensing platform shows very high sensitivity and it can detect heparin and protamine at concentrations as low as 0.05 μg mL(-1). The selectivity of the sensing platform towards heparin was examined with potential interferents such as hyaluronic acid (HA) and chondroitin-4-sulfate (CS). Both HA and CS did not interfere with the measurement of heparin. The practical application of the sensing platform was demonstrated by measuring the concentration of heparin and protamine in human serum samples. The sensing platform could successfully quantify the concentration of heparin and protamine in the real serum samples with excellent recovery. The sensing platform was robust and could be used for repeated measurement without compromising the sensitivity.

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“…Silver nanoparticles were synthesized according to methods found in the literature 26 , 27 . Specifically, 0.1 M AgNO 3 aqueous solution was refluxed at 100 °C, followed by a quick injection of a second aqueous solution containing 2 wt% citric acid trisodium salt.…”

Section: Methodsmentioning

confidence: 99%

Anomalous Growth Rate of Ag Nanocrystals Revealed by in situ STEM

Chu

et al. 2017

Sci Rep

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In situ microscopy of colloidal nanocrystal growth offers a unique opportunity to acquire direct and straightforward data for assessing classical growth models. Here, we observe the growth trajectories of individual Ag nanoparticles in solution using in situ scanning transmission electron microscopy. For the first time, we provide experimental evidence of growth rates of Ag nanoparticles in the presence of Pt in solution that are significantly faster than predicted by Lifshitz-Slyozov-Wagner theory. We attribute these observed anomalous growth rates to the synergistic effects of the catalytic properties of Pt and the electron beam itself. Transiently reduced Pt atoms serve as active sites for Ag ions to grow, thereby playing a key role in controlling the growth kinetics. Electron beam illumination greatly increases the local concentration of free radicals, thereby strongly influencing particle growth rate and the resulting particle morphology. Through a systematic investigation, we demonstrate the feasibility of utilizing these synergistic effects for controlling the growth rates and particle morphologies at the nanoscale. Our findings not only expand the current scope of crystal growth theory, but may also lead to a broader scientific application of nanocrystal synthesis.

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Polyelectrolyte-Templated Synthesis of Bimetallic Nanoparticles

Cited by 16 publications

References 24 publications

Creating Conductive Copper–Silver Bimetallic Nanostructured Coatings Using a High Temperature Reducing Jet Aerosol Reactor

Creating Conductive Copper–Silver Bimetallic Nanostructured Coatings Using a High Temperature Reducing Jet Aerosol Reactor

Polyelectrolyte‐Functionalized Gold Nanoparticle Scaffold for the Sensing of Heparin and Protamine in Serum

Anomalous Growth Rate of Ag Nanocrystals Revealed by in situ STEM

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