Microwave-polyol controlled synthesis and magnetic properties of monodisperse Co{sub x}Ni{sub 1−x}Fe{sub 2}O{sub 4}/MWCNT nanocomposites
Journal Article
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· Materials Research Bulletin
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.
- OSTI ID:
- 22285213
- Journal Information:
- Materials Research Bulletin, Journal Name: Materials Research Bulletin Journal Issue: 11 Vol. 48; ISSN MRBUAC; ISSN 0025-5408
- Country of Publication:
- United States
- Language:
- English
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