Title :
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
Abstract :
The hydrothermal synthesis (HS) of homogeneous and core shell CoxNi1-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 CoxNi1-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; CoxNi1-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;
Conference_Titel :
Nanotechnology (IEEE-NANO), 2012 12th IEEE Conference on
Conference_Location :
Birmingham
Print_ISBN :
978-1-4673-2198-3
DOI :
10.1109/NANO.2012.6322173
