Solvothermal hot injection synthesis of AgNi nanoalloy

VYKOUKAL, Vít, Jiří BURŠÍK, Pavla ROUPCOVÁ and Jiří PINKAS. Solvothermal hot injection synthesis of AgNi nanoalloy. In Nanotech France 2016 International Conference and Exhibition. 2016. ISSN 1476-4687.

Basic information

• Original name: Solvothermal hot injection synthesis of AgNi nanoalloy
• Name in Czech: Solvotermální příprava metodou vstříkování za horka nanoslitiny AgNi
• Authors: VYKOUKAL, Vít, Jiří BURŠÍK, Pavla ROUPCOVÁ and Jiří PINKAS.
• Edition: Nanotech France 2016 International Conference and Exhibition, 2016.

Other information

• Original language: English
• Type of outcome: Conference abstract
• Field of Study: 10402 Inorganic and nuclear chemistry
• Country of publisher: France
• Confidentiality degree: is not subject to a state or trade secret
• WWW: URL
• Impact factor: Impact factor: 40.137
• Organization unit: Faculty of Science
• ISSN: 1476-4687
• Keywords (in Czech): nanoslitina, AgNi, solvotelmální vstřikování za horka
• Keywords in English: nanoalloy, AgNi, solvothermal hot injection

Abstract

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.

Links

• GA14-12653S, research and development project: Name: Stabilita a fázové rovnováhy binárních nanočástic kovů (Acronym: Bimetal_nano)

Investor: Czech Science Foundation

• LD11046, research and development project: Name: Fázové diagramy nanoslitin, jejich výpočty a ověření. (Acronym: PHADINANOAL)

Investor: Ministry of Education, Youth and Sports of the CR

• LQ1601, research and development project: Name: CEITEC 2020 (Acronym: CEITEC2020)

Investor: Ministry of Education, Youth and Sports of the CR