J 2019

Solvothermal hot injection synthesis of core-shell AgNi nanoparticles

VYKOUKAL, Vít, Jiří BURŠÍK, Pavla ROUPCOVÁ, D.A. CULLEN, Jiří PINKAS et. al.

Basic information

Original name

Solvothermal hot injection synthesis of core-shell AgNi nanoparticles

Authors

VYKOUKAL, Vít (203 Czech Republic, belonging to the institution), Jiří BURŠÍK (203 Czech Republic), Pavla ROUPCOVÁ (203 Czech Republic), D.A. CULLEN (840 United States of America) and Jiří PINKAS (203 Czech Republic, guarantor, belonging to the institution)

Edition

Journal of Alloys and Compounds, Švýcarsko, Elsevier, 2019, 0925-8388

Other information

Language

English

Type of outcome

Článek v odborném periodiku

Field of Study

10402 Inorganic and nuclear chemistry

Country of publisher

Switzerland

Confidentiality degree

není předmětem státního či obchodního tajemství

References:

Impact factor

Impact factor: 4.650

RIV identification code

RIV/00216224:14310/19:00107202

Organization unit

Faculty of Science

DOI

UT WoS

000449486300045

Keywords in English

Nanostructured materials; Metals and alloys; Chemical synthesis; Energy-dispersive X-ray spectroscopy; Magnetic measurements; Transmission electron microscopy

Tags

Tags

International impact, Reviewed
Změněno: 11/10/2024 12:07, Ing. Marie Švancarová

Abstract

V originále

Silver-nickel core-shell nanoparticles (NP) were prepared by solvothermal hot injection synthesis by simultaneous thermolysis/reduction of AgNO3 and Ni(acac)(2) precursors in the hot mixture of octadecene and oleylamine. Oleylamine decreases decomposition temperature of AgNO3 to that of Ni(acac)(2) thus ensuring favorable reaction conditions. The prepared AgNi NPs with different Ag/Ni ratios were completely characterized. Dynamic light scattering (DLS) and small angle X-ray scattering (SAXS) were used for particle size characterization of as-prepared AgNi colloids. There is no dependence of the particle size (13-21 nm by SAXS) on the Ag/Ni stoichiometric ratio, but the ultraviolet-visible spectroscopy (UV-vis) reveals that the intensity of the surface plasmon (SPR) decreases with increasing Ni content. Transmission electron microscopy (TEM) verified the results of DLS and SAXS and showed spherical nanoparticle shape. Distribution of individual elements in the nanoparticles was mapped by high resolution scanning transmission electron microscopy and energy dispersive X-ray spectroscopy (STEM-EDS) and revealed their core-shell structure where an Ag nucleus is covered by a thin amorphous Ni layer. Upon heating to 400 degrees C, Ni crystallization is substantiated by appearance of diffractions in the high-temperature X-ray powder diffractograms (HT-XRD) and of a magnetic moment. Ultimate phase separation was proven by scanning electron microscopy and energy dispersive X-ray analysis (SEM-EDS) in samples heated to 1000 degrees C. The reaction course and nanoparticle formation studied by DLS, UV-vis, and Ag and Ni elemental analyses reveal an initial Ag seed formation with subsequent Ni overlayer deposition after 180 s. (C) 2018 Elsevier B.V. All rights reserved.

Links

GA17-15405S, research and development project
Name: Pokročilé experimentální a teoretické přístupy k fázovým diagramům nanoslitin se zahrnutím vlivu velikosti částic
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
90043, large research infrastructures
Name: CIISB