AgNi core-shell nanoparticles by hot injection synthesis
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| Year of publication | 2017 |
| Type | Conference abstract |
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| 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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