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Title: Synthesis and characterizations of Ni-Fe@spinel oxide core-shell nanoparticles
Authors: Zhang, H.T. 
Ding, J. 
Chow, G.M. 
Keywords: A. Magnetic materials
A. Nanostructures
B. Chemical synthesis
D. Magnetic properties
Issue Date: 6-May-2009
Citation: Zhang, H.T., Ding, J., Chow, G.M. (2009-05-06). Synthesis and characterizations of Ni-Fe@spinel oxide core-shell nanoparticles. Materials Research Bulletin 44 (5) : 1195-1199. ScholarBank@NUS Repository.
Abstract: 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. © 2008 Elsevier Ltd. All rights reserved.
Source Title: Materials Research Bulletin
ISSN: 00255408
DOI: 10.1016/j.materresbull.2008.09.042
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