Abstract
We used a facile solvothermal method to synthesize well dispersed pyrite cobalt disulfide nanoparticles by using sulfur powder and ethylenediamine as sulfur source and solvent, respectively. The chemical composition of the nanoparticles is determined to be CoS1.931. These nanoparticles are of spherical and quasi-spherical shapes, and the diameters are in the range from 20 to 60nm. Photoluminescence spectra show two emission bands centered at 411 and 532nm, respectively. Magnetic measurement indicates a broad homogeneous ferromagnetic–paramagnetic transition with Tcca. 140K. It is found that intrinsic point defects including VS, Coi, CoS, Si may be the main reason for the unusual emission bands and increased Tc.
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