Hauptseite > Publikationsdatenbank > Temperature-Induced Stress Relaxation in Alloyed Silver–Gold Nanoparticles (7–8 nm) by in Situ X-ray Powder Diffraction > print

001     878394
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024 7 _ |a 10.1021/acs.cgd.9b00728
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037 _ _ |a FZJ-2020-02830
082 _ _ |a 540
100 1 _ |a Prymak, Oleg
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245 _ _ |a Temperature-Induced Stress Relaxation in Alloyed Silver–Gold Nanoparticles (7–8 nm) by in Situ X-ray Powder Diffraction
260 _ _ |a Washington, DC
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520 _ _ |a Alloyed silver–gold nanoparticles (spherical, 8 nm) were wet-chemically prepared by reduction with sodium citrate/tannic acid and colloidally stabilized by poly(N-vinylpyrrolidone) (PVP), in steps of 10 atom %, including pure silver nanoparticles (35 nm) and pure gold nanoparticles (7 nm). The nanoparticles were subjected to in situ X-ray powder diffraction up to 850 °C to induce internal stress relaxation and recrystallization. The stress-induced negative deviation from Vegard’s rule that was present in the original alloyed nanoparticles vanished between 150 and 250 °C, indicating the internal healing of defects. Simultaneously, a discontinuous increase in the crystallite size and a drop in the microstrain were observed. After heating to 850 °C, the original gradient structure (silver-rich shell, gold-rich core) had changed to a homogeneous elemental distribution as shown by high-angle annular dark-field scanning transmission electron microscopy/energy-dispersive X-ray spectroscopy (STEM/EDX). Thus, there is a considerable mobility of the metal atoms inside the nanoparticles that starts as low as 150 °C.
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536 _ _ |a DFG project 286659497 - Bimetallische Nanopartikel der Platinmetalle (Ru, Rh, Pd, Os, Ir, Pt) und des Silbers: Synthese, Mikrostruktur und biologische Wirkung (286659497)
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536 _ _ |a DFG project 257727131 - Nanoskalige Pt Legierungselektrokatalysatoren mit definierter Morphologie: Synthese, Electrochemische Analyse, und ex-situ/in-situ Transmissionselektronenmikroskopische (TEM) Studien (257727131)
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700 1 _ |a Grasmik, Viktoria
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700 1 _ |a Loza, Kateryna
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700 1 _ |a Heggen, Marc
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700 1 _ |a Epple, Matthias
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773 _ _ |a 10.1021/acs.cgd.9b00728
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856 4 _ |u https://juser.fz-juelich.de/record/878394/files/acs.cgd.9b00728.pdf
856 4 _ |y Published on 2019-11-21. Available in OpenAccess from 2020-11-21.
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856 4 _ |y Published on 2019-11-21. Available in OpenAccess from 2020-11-21.
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