Nano Archive

Synthesis and Magnetic Properties of CoO Nanoparticles

Ghosh, Moumita and Sampathkumaran, E. V. and Rao, C. N. R. (2005) Synthesis and Magnetic Properties of CoO Nanoparticles. CHEMISTRY OF MATERIALS, 17 (9). pp. 2348-2352.

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Abstract

Pure CoO nanoparticles in the 4.5−18 nm range have been prepared by the decomposition of Co(ΙΙ) 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
Subjects:Physical Science > Nanophysics
Physical Science > Nanomagnetics
Material Science > Nanochemistry
Divisions:Faculty of Engineering, Science and Mathematics > School of Physics
Faculty of Engineering, Science and Mathematics > School of Chemistry
ID Code:3620
Deposited By:JNCASR
Deposited On:19 Jan 2009 09:41
Last Modified:12 Nov 2010 15:52

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