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• W4318948844 abstract "Abstract Stable silver clusters can be prepared by a simple electroless reduction reaction taking place in water-in-oil emulsions. An emulsion containing AgNO 3 in the water droplets was mixed with a similar emulsion containing aqueous NaBH 4 droplets. The droplet diameter, based on Rayleigh scattering, was 41 nm and the mean number of Ag + ions in each droplet varied from 2.0 to 21.7 as the concentration increased from 90 μ M to 1 mM AgNO 3 . The low number of Ag + ions in each droplet inhibits the growth of large nanoparticles and these emulsions do not show the large plasmon band observed for Ag nanoparticles obtained by the analogous reaction in bulk solution at the same Ag + concentrations. Atomic force microscopy provides evidence of small Ag nanoclusters and a much lower number of larger nanoparticles. Electrospray mass spectrometry suggests that the clusters are mainly Ag 4 species coordinated to water and BH 4 − . The Ag nanocluster-containing emulsions are fluorescent and show an emission band with a peak wavelength of 427 nm and a Stokes shift of 81 nm from the first peak at 346 nm in the excitation spectrum. The intensity of fluorescence decreased as the [Ag(I)] increased and our most fluorescent samples were prepared from 90 μ M AgNO 3 because at higher concentrations more Ag nanoparticles are formed. DFT calculations on Ag n clusters indicated that Ag 4 species favour a planar rhombic geometry even in the presence of coordinating water molecules or BH 4 − . However calculations of vertical excitation energies for Ag 4 species do not match the experimental excitation spectra and this suggests the fluorescence arises from bright AgNCs of different nuclearity present at lower abundance in the mixture of species produced by the emulsion reaction. Calculated excitation energies for Ag 6 give the best fit to the available data." @default.
• W4318948844 created "2023-02-03" @default.
• W4318948844 creator A5009089272 @default.
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• W4318948844 date "2022-12-01" @default.
• W4318948844 modified "2023-09-30" @default.
• W4318948844 title "Silver nanoclusters prepared in water-in-oil emulsions" @default.
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• W4318948844 doi "https://doi.org/10.1088/2632-959x/acb83a" @default.
• W4318948844 hasPublicationYear "2022" @default.
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