Synthesis and magnetic properties of CoO nanoparticles

Ghosh, Moumita ; Sampathkumaran, E. V. ; Rao, C. N. R. (2005) Synthesis and magnetic properties of CoO nanoparticles Chemistry of Materials, 17 (9). pp. 2348-2352. ISSN 0897-4756

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Pure CoO nanoparticles in the 4.5-18 nm range have been prepared by the decomposition of Co(II) cupferronate in Decalin at 270°C under solvothermal conditions. The particles have been characterized by X-ray diffraction, transmission electron microscopy, and cognate techniques. The particles are stable because of the organic coating that occurs in situ. The organic coating is readily removed by heating the particles to 260°C without loss of the nanoparticulate nature. Magnetic measurements reveal the presence of ferromagnetic interactions at low temperatures in the small CoO nanoparticles (<16 nm). The small nanoparticles do not exhibit a distinct antiferromagnetic transition around 300 K as the bulk sample but instead show hysteresis below a blocking temperature of ~10 K.

Item Type:Article
Source:Copyright of this article belongs to American Chemical Society.
ID Code:43537
Deposited On:11 Jun 2011 14:34
Last Modified:11 Jun 2011 14:34

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