SYNTHESİS AND CHARACTERIZATION OF COBALT SULFIDE NANOSTRUCTURES USING THIOUREA

O.O.Balayeva, A.A.Azizov, M.B.Muradov, A.M.Maharramov, G.M.Eyvazova, R.M.Alosmanov, Z.Q.Mamiyev, Z.A.Aghamaliyev

Cobalt sulfide nanoparticles were synthesized through a successive ionic layer adsorption and reaction (SILAR) method at room temperature. Co(NO₃)₂·6H₂O and thiourea [(NH₂)₂CS] aqueous solutions were used as precursors. Obtained cobalt sulfide nanomaterials were heated at 100ºC temperature in a vacuum. By XRD analysis mixed phases of Co₃S₄, CoS_1.097 and CoS₂ were obtained with dominance of Co₃S₄ phase. The average size of cobalt sulphide nanoparticles in mixed phases obtained at 8 cycles of the reaction was estimated 9.8 nm. The optical band gap of the Co_xS_y nanomaterials was found 1.59 eV. By SEM analysis the obtained cobalt sulfide nanocrystals display a rice-like morphology.

Keywords : cobalt sulfide, nanocomposites, structural and optical properties

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