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Solvothermal hot injection synthesis of AgNi nanoalloy

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Year of publication 2016
Type Conference abstract
MU Faculty or unit

Faculty of Science

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Description Nanomaterials and especially their preparation by chemical approach is a very active field of materials research. The synthesis of nanoalloys is one integral part of nanoscience and development of efficient methods is a challenging task due to their chemical, phase, and morphological variability. In case of metal nanoalloys we can observe many interesting properties such as depression of melting point,1,2 plasmon resonance,3,4 catalytic activity,5 and phase separation.6 Nanoalloys can be prepared by many approaches, but highly advantageous is the solvothermal synthesis, specifically in oleylamine.5,7 The hot injection technique appears to be the best for ensuring homogeneous conditions for nanoparticles nucleation and growth. AgNi nanoparticles were prepared by injection of an oleylamine solution (4 cm3) of AgNO3 and Ni(acac)2 (different molar ratios, 4 mmol total amount) to a mixture of oleylamine (16 cm3) and octadecene (20 cm3) at 230 °C. After 10 minutes, the reaction mixture was cooled down to room temperature in a water bath. Then 20 cm3 of acetone was added to precipitate nanoparticles and the suspension was centrifuged. The precipitate was washed by a mixture of hexane and acetone (1:3 volume ratio). This procedure was repeated twice and finally the precipitate was dispersed in hexane and characterized. Dynamic Light Scattering (DLS), Transmission Electron Microscopy (TEM), Elemental analyses (ICP OES), and Small-Angle X-ray Scattering (SAXS) analyses were performed for determination of chemical composition, average size, size distribution, and shape of the prepared nanoparticles. Plasmon resonances were observed and we found that the intensity of plasmon resonance was dependent on the molar ratio of AgNi in the particles. HT-XRD was carried out and we observed a phase separation in the prepared nanoalloy. Magnetic properties and their dependence on temperature were also characterized and the results are in a good agreement with the HT-XRD characterization.
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