Abstract
Monodisperse cobalt monoxide (CoO) nanocrystals ranging in size from 4.5 to23 nm were prepared via the thermal decomposition of cobalt acetylacetonate(Co(acac)2) in oleylamine under vigorous stirring. The size control of the nanocrystals wasachieved by tailoring the reaction temperature or by seed-mediated growth. Thenanocrystals have been characterized by x-ray diffraction, transmission electronmicroscopy, and Fourier transform infrared and x-ray photoelectron spectroscopy. Theas-prepared nanocrystals are stable because of the organic coating (oleylamine) thatoccurred in situ. Magnetic measurement reveals that all of the nanocrystals aresuperparamagnetic at high temperatures and show ferromagnetic interactions at lowtemperatures due to the existence of uncompensated moments on the surface of thenanoparticles. The weak ferromagnetic interactions increase with decreasing particle size.
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