Abstract
Cubic (fcc) CoO nanoparticles and nanoaggregates in the sub-15 nm range have been prepared by the decomposition of Co(NO3)2 in polyethylene-glycol (PEG-600) at 250 °C. The particles have been characterized by X-ray diffraction, transmission electron microscopy, and cognate techniques. The particles are very stable in nonpolar organic solvents because of the organic coating that occurs in situ. Anomalous magnetic properties, such as ferromagnetic features and shifted magnetic hysteresis loops, are observed indicating the presence of both rotatable and fixed uncompensated surface spins with high local anisotropy.
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