Reflux synthesis of Co3O4 nanoparticles and its magnetic characterization


Ozkaya T., Baykal A., Toprak M. S. , Koseoglu Y., Durmus Z.

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS, cilt.321, ss.2145-2149, 2009 (SCI İndekslerine Giren Dergi) identifier identifier

  • Cilt numarası: 321 Konu: 14
  • Basım Tarihi: 2009
  • Doi Numarası: 10.1016/j.jmmm.2009.01.003
  • Dergi Adı: JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
  • Sayfa Sayısı: ss.2145-2149

Özet

Co3O4 nanoparticles have been prepared for the first time via reflux method, as an alternative low-temperature high-yield process, starting from one single precursor. A plausible mechanism is suggested for the synthetic process. XRD, TEM, FTIR and VSM were used for the structural, morphological, spectroscopic, and magnetic characterization of the product respectively. X-ray diffraction line profile fitting showed that average particle size of the sample is 28 nm. Morphology of the synthesized powder was observed to be thin nanosheets with a thickness of 2-3 nm based on SEM and TEM analyses. Magnetic measurements showed a deviation of the Neel temperature from the bulk value which is attributed to the finite size effects. A loop shift with an enhanced coercivity is observed in the field-cooled hysteresis loops. The opening of the hysteresis loop reveals the existence of the spin-glass like surface spins of the Co3O4 nanoparticles. (C) 2009 Elsevier B.V. All rights reserved.