Synthesis and characterizations of Ni-Fe-spinel oxide core-shell nanoparticles

Journal Article · Wed May 06 00:00:00 EDT 2009 · Materials Research Bulletin

DOI:https://doi.org/10.1016/j.materresbull.2008.09.042· OSTI ID:21199784

Ding, J; Chow, G M ^[1]

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1. Department of Materials Science and Engineering, Faculty of Engineering, National University of Singapore, Singapore 117574 (Singapore)

Core-shell Ni-Fe-ferrite nanoparticles with an average diameter of 14 nm and shell thickness of 3 nm were synthesized through a redox-transmetalation process. The alloy core and spinel oxide shell were verified by X-ray photoelectron spectroscopy, X-ray diffraction, and transmission electron microscopy. The hydrophobic oleylamine molecules on the surface were replaced by hydrophilic meso-2,3-Dimercaptosuccinic acid to make the nanoparticles to be water-soluble. X-ray diffraction study of the as-prepared core-shell nanoparticles indicates that they remained face centered cubic alloy core and spinel shell form in air. Magnetic measurements indicate that the core-shell nanoparticles exhibit superparamagnetic and exchange bias characteristics at 300 K and 5 K, respectively.

• OSTI ID: 21199784
• Journal Information: Materials Research Bulletin, Vol. 44, Issue 5; Other Information: DOI: 10.1016/j.materresbull.2008.09.042; PII: S0025-5408(08)00344-9; Copyright (c) 2008 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved; Country of input: International Atomic Energy Agency (IAEA); ISSN 0025-5408
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
FCC LATTICES
FERRITES
MAGNETIC MATERIALS
MAGNETIC PROPERTIES
NANOSTRUCTURES
NICKEL COMPOUNDS
OXIDES
PARTICLES
SHELLS
SPINELS
SUPERPARAMAGNETISM
SURFACES
SYNTHESIS
TEMPERATURE RANGE 0000-0013 K
TEMPERATURE RANGE 0273-0400 K
TRANSMISSION ELECTRON MICROSCOPY
X-RAY DIFFRACTION
X-RAY PHOTOELECTRON SPECTROSCOPY