authors |
Hennous, M; Ramana, EV; Tobaldi, DM; Costa, BFO; Valente, MA; Labrincha, J; Karmaoui, M |
nationality |
International |
journal |
NEW JOURNAL OF CHEMISTRY |
keywords |
COFE2O4 NANOPARTICLES; EFFICIENT CATALYST; HIGH COERCIVITY; PERFORMANCE; SIZE; PARTICLES; OXIDE; CO; PLATFORM; ARRAYS |
abstract |
We applied a general non-aqueous route for the formation of mono-, bi-, tri-, tetra, hexapod and multipod magnetic spinel ferrite metal oxide (CoFe2O4) nanocrystals. The magnetic CoFe2O4 nanocrystals were characterized by X-ray diffraction, high-resolution transmission electron microscopy, Raman spectroscopy, magnetometry and Mossbauer spectroscopy, to understand their structure and magnetic properties. These CoFe2O4 nanoparticles have the smallest particle size reported ever, with a mean diameter of similar to 3 nm. The coercivity was found to be larger compared to that reported in the literature for spherical particles. Mossbauer spectroscopy indicated a magnetic transition above room temperature, where 20% of the Fe ions transit to a paramagnetic state, around 400 K. From the thermal dependence of magnetic parameters, the blocking temperature was estimated to be around 425 K. These studies indicate that our CoFe2O4 nanocrystals are different from their cubic/spherical counterparts, which generally display a single domain character. These CoFe2O4 nanocrystals display a strong shape anisotropy dependent magnetic property. |
publisher |
ROYAL SOC CHEMISTRY |
issn |
1144-0546 |
isbn |
1369-9261 |
year published |
2019 |
volume |
43 |
issue |
26 |
beginning page |
10259 |
ending page |
10269 |
digital object identifier (doi) |
10.1039/c9nj02237f |
web of science category |
Chemistry, Multidisciplinary |
subject category |
Chemistry |
unique article identifier |
WOS:000474625700004
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ciceco authors
impact metrics
journal analysis (jcr 2019):
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journal impact factor |
3.288 |
5 year journal impact factor |
3.153 |
category normalized journal impact factor percentile |
61.864 |
dimensions (citation analysis):
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altmetrics (social interaction):
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