Synthesis, structure and magnetic properties of multipod-shaped cobalt ferrite nanocrystals
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
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
  ciceco authors
  impact metrics
journal analysis (jcr 2017):
journal impact factor 3.201
5 year journal impact factor 3.181
category normalized journal impact factor percentile 62.281
dimensions (citation analysis):
altmetrics (social interaction):



 


Sponsors

1suponsers_list_ciceco.jpg