Hydrothermal synthesis of homogeneous and core/shell CoxNi1−xFe2O4 nanoparticles

Author

Almeida, Trevor P. ; Fay, Michael W. ; Zhu, Yanqiu ; Brown, Paul D.

Author_Institution

Dept. of Earth Sci. & Eng., Imperial Coll. London, London, UK

fYear

2012

Firstpage

1

Lastpage

5

Abstract

The hydrothermal synthesis (HS) of homogeneous and core shell Co_xNi_1-xFe₂O₄ nanoparticles (NPs) from mixed FeCl₃ / CoCl₂ / NiCl₂ precursor solutions has been investigated, using the complementary characterization techniques of X-ray diffractometry, transmission electron microscopy, energy dispersive X-ray analysis and electron energy loss spectroscopy. At pH ~ 8, the HS of Co_xNi_1-xFe₂O₄ NPs, up to ~ 25 nm in size, was found to proceed through the formation and dissolution of intermediate Fe(OH)₃ and [FeCoNi₂(OH)₈]⁺.[Cl.H₂O]^- phases. The structure of core/shell NiFe₂O₄/CoFe₂O₄ and CoFe₂O₄/NiFe₂O₄ NPs were confirmed.

Keywords

X-ray diffractometers; cores; electron energy loss spectra; nanoparticles; nanotechnology; transmission electron microscopy; Co_xNi_1-xFe₂O₄; FeCl₃-CoCl₂-NiCl₂; X-ray diffractometry; complementary characterization technique; core shell; electron energy loss spectroscopy; energy dispersive X-ray analysis; hydrothermal synthesis; nanoparticles; precursor solution; transmission electron microscopy; Ferrites; Iron; Magnetic analysis; Nickel; X-ray scattering;

fLanguage

English

Publisher

ieee

Conference_Titel

Nanotechnology (IEEE-NANO), 2012 12th IEEE Conference on

Conference_Location

Birmingham

ISSN

1944-9399

Print_ISBN

978-1-4673-2198-3

Type

conf

DOI

10.1109/NANO.2012.6322173

Filename

6322173