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Title: Microwave-polyol controlled synthesis and magnetic properties of monodisperse Co{sub x}Ni{sub 1−x}Fe{sub 2}O{sub 4}/MWCNT nanocomposites

Graphical abstract: - Highlights: • Microwave-polyol preparation of monodisperse Co{sub x}Ni{sub 1−x}Fe{sub 2}O{sub 4}/MWCNT nanocomposites. • The composition is controlled through adjusting atomic ratios of Co and Ni salts. • Ms increases with increasing Co content. Hc is zero exhibiting superparamagnetic. - Abstract: Monodisperse Co{sub x}Ni{sub 1−x}Fe{sub 2}O{sub 4} nanoparticles (x = 0, 0.2, 0.4, 0.5, 0.6, 0.8, and 1) with controllable composition attached on the multi-walled carbon nanotubes (MWCNTs) were prepared by microwave-polyol method. The composition of Co{sub x}Ni{sub 1−x}Fe{sub 2}O{sub 4} nanoparticles can be controlled through adjusting the atomic ratios of cobalt and nickel nitrate in the mixed solution. The influence of the microwave power and microwave irradiation time on the monodispersion of nanoparticles was also investigated. The results show quasi-spherical Co{sub x}Ni{sub 1−x}Fe{sub 2}O{sub 4} nanoparticles with the face-centered cubic structure and average crystallite size (6 nm) are uniformly dispersed on MWCNTs. The saturation magnetization of Co{sub x}Ni{sub 1−x}Fe{sub 2}O{sub 4}/MWCNT nanocomposites increases gradually from 12.90 to 20.03 emu/g with increasing Co{sup 2+} concentration. The coercivity is almost zero at room temperature, which indicates the superparamagnetic behavior.
Authors:
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Publication Date:
OSTI Identifier:
22285213
Resource Type:
Journal Article
Resource Relation:
Journal Name: Materials Research Bulletin; Journal Volume: 48; Journal Issue: 11; Other Information: Copyright (c) 2013 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; CARBON NANOTUBES; COBALT; COBALT IONS; COERCIVE FORCE; COMPOSITE MATERIALS; FCC LATTICES; MAGNETIC MATERIALS; MAGNETIC PROPERTIES; MICROWAVE RADIATION; NICKEL NITRATES; SUPERPARAMAGNETISM; SYNTHESIS; TEMPERATURE RANGE 0273-0400 K; X-RAY DIFFRACTION