AgNi core-shell nanoparticles by hot injection synthesis

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Authors

VYKOUKAL Vít PINKAS Jiří

Year of publication 2017
Type Conference abstract
MU Faculty or unit

Faculty of Science

Citation
Description Metal nanoalloys display many unusual properties, such as depression of melting point, plasmon resonance, catalytic activity, and phase separation. Nanoalloys can be prepared by a variety of synthetic approaches, but highly advantageous is the solvothermal synthesis, specifically in oleylamine (OA). Silver and nickel are mutually immiscible, but in the nanoform are in a very close contact and thus create atypical structures. AgNi nanoparticles were prepared by injection of a small volume of OA solution of AgNO3 and Ni(acac)2 in different molar ratios to a mixture of OA and octadecene at 230 °C. After 10 min, the reaction mixture was cooled down to room temperature and acetone was added to precipitate nanoparticles. The suspension was centrifuged and the precipitate was washed twice by a mixture of hexane and acetone. Finally, the precipitate was dispersed in hexane and characterized. Dynamic light scattering (DLS), transmission electron microscopy (TEM), elemental analyses (ICP OES), small-angle X-ray scattering (SAXS) and high-resolution TEM/STEM with EELS and EDS analyses were performed for determination of chemical composition, average size, size distribution and shape of the prepared nanoparticles. Elemental mapping of individual nanoparticles showed a core/shell structure in which the silver nucleus was covered by a nickel layer. HT-XRD together with VSM and SEM/EDX analysis prove the phase separation and reveal magnetic properties. Acknowledgements: This research has been financially supported by the Ministry of Education, Youth and Sports of the Czech Republic under the project CEITEC 2020 (LQ1601).
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