An in situ SAXS investigation of the formation of silver nanoparticles and bimetallic silver–gold nanoparticles in controlled wet-chemical reduction synthesis
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2020
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Nanoscale Advances
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We present a study on the formation of silver (Ag) and bimetallic silver–gold (AgAu) nanoparticlesmonitored
by in situ SAXS as well as by ex situ TEM, XRD and UV-vis analysis in a flow reactor at controlled reaction
temperature. The formation mechanism of the nanoparticles is derived from the structural parameters
obtained from the experimental data. The evolution of the average particle size of pure and alloyed
nanoparticles shows that the particle growth occurs initially by a coalescence mechanism. The later
growth of pure silver nanoparticles is well described by Ostwald ripening and for the alloyed
nanoparticles by a process with a significantly slower growth rate. Additionally, the SAXS data of pure
silver nanoparticles revealed two major populations of nanoparticles, the first one with a continuous
crystal growth to a saturation plateau, and the second one probably with a continuous emergence of
small new crystals. The particle sizes obtained by SAXS agree well with the results from transmission
electron microscopy and X-ray diffraction. The present study demonstrates the capability of an in situ
investigation of synthesis processes using a laboratory based SAXS instrument. Online monitoring of the
synthesis permitted a detailed investigation of the structural evolution of the system.
Como referenciar
GARCIA, PAULO R.A.F.; PRYMAK, OLEG; GRASMIK, VIKTORIA; PAPPERT, KEVIN; WLYSSES, WAGNER; OTUBO, LARISSA; EPPLE, MATTHIAS; OLIVEIRA, CRISTIANO L.P. An in situ SAXS investigation of the formation of silver nanoparticles and bimetallic silver–gold nanoparticles in controlled wet-chemical reduction synthesis. Nanoscale Advances, v. 2, n. 1, p. 225-238, 2020. DOI: 10.1039/c9na00569b. Disponível em: http://repositorio.ipen.br/handle/123456789/31076. Acesso em: 26 Apr 2024.
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