Synthesis of nickel and cobalt sulfide nanoparticles using a low cost sonochemical methodKristl, Matjaž (Avtor) Dojer, Brina (Avtor) Gyergyek, Sašo (Avtor) Kristl, Janja (Avtor) material scienceinorganic chemistrynanotechnologyNickel and cobalt sulfides are promising materials in different cutting-edge research areas like solar cells, supercapacitors, catalysts, and electrode materials. Nickel and cobalt sulfides with various stoichiometries have been synthesized sonochemically from $Ni(CH_3COO)_2$ ∙ $4H_2O$, $Co(CH_3COO)_2$ ∙ $2H_2O$ and different sulfur precursors using a direct immersion ultrasonic probe. The products were characterized by X-ray powder diffraction, transmission electron microscopy (TEM) including EDX analysis, IR and UV–Vis spectroscopy and elemental analysis. Following products have been obtained: $NiS$, $Ni_3S_4$, $CoS_{1.097}$ and $Co_9S_8$, with average crystallite sizes in the range 7−30 nm. Effects of different reaction conditions on the size, morphology and optical band-gap energy were evaluated. Optical band-gap energies in the range 3.3 eV−3.8 eV were observed for the obtained nanoparticles.20172017-07-14 12:26:47Znanstveno delo66884ISSN: 2405-8440UDK: 54OceCobissID: 21607432COBISS_ID: 20516118DOI: 10.1016/j.heliyon.2017.e00273ISSN pri članku: 2405-8440NUK URN: URN:SI:UM:DK:5F8D67AQsl