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• W2000511019 abstract "Aqueous solutions of Ag−Pt ions and poly(vinyl alcohol) were irradiated with gamma rays at dose rates below 0.5 kGy/h to generate nanoparticles. The nanoparticles were characterized with several experimental techniques. Transmission electron microscopy showed that, surprisingly, the nanoparticles were not spherical but had a high aspect ratio. Wirelike structures were generated with lengths up to 3.5 μm and diameters between 3 and 20 nm. Selected-area diffraction showed that the wires were polycrystalline and that individual grains making up the wires had a face-centered cubic (fcc) structure. The optical absorption of samples, with a Ag/Pt mole ratio higher than 80%, exhibited a Ag surface plasmon absorption band centered around 400 nm. The plasmon band broadened with increasing Pt molar ratio and was replaced by a monotonically decaying background for a Pt molar ratio higher than about 30%. Alloying in the Ag−Pt nanoparticles was investigated with X-ray absorption spectroscopy. The Pt L3 edge (11.564 keV) was excited to determine the local structure around the Pt atoms. A contraction in the first shell of 0.05 Å was observed, which ruled out the formation of a Ag−Pt homogeneous alloy and suggested the formation of core−shell particles. To understand the mechanism of formation of the nanoparticles, several experimental parameters such as the total radiation dose, type of polymer, metal and polymer concentrations, and type of counterions in solution were varied. The most relevant parameters inducing filament growth were the counterions added to the solution, the mole ratio between the two metals, and the capping polymer. For example, spherical particles resulted if AgNO3 was used instead of Ag2SO4, if the Ag/Pt mole ratio was higher than 80% or lower than 20%, and if the degree of hydrolysis of the poly(vinyl alcohol) was higher than 98%." @default.
• W2000511019 created "2016-06-24" @default.
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• W2000511019 date "2003-03-11" @default.
• W2000511019 modified "2023-09-27" @default.
• W2000511019 title "Radiolytic Synthesis of Bimetallic Ag−Pt Nanoparticles with a High Aspect Ratio" @default.
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• W2000511019 doi "https://doi.org/10.1021/jp0273124" @default.
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