AgNi core-shell nanoparticles by hot injection synthesis

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216224%3A14310%2F17%3A00098146" target="_blank" >RIV/00216224:14310/17:00098146 - isvavai.cz</a>

Výsledek na webu

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DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

AgNi core-shell nanoparticles by hot injection synthesis

Popis výsledku v původním jazyce

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).

Název v anglickém jazyce

AgNi core-shell nanoparticles by hot injection synthesis

Popis výsledku anglicky

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).

Druh

O - Ostatní výsledky

CEP obor

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OECD FORD obor

10402 - Inorganic and nuclear chemistry

Projekt

Výsledek vznikl pri realizaci vícero projektů. Více informací v záložce Projekty.

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2017

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů