Investigations on the preparation and properties of lanthanum doped cobalt nickel sulphide (CNS) nanoparticles

Nickel and cobalt sulfides are promising materials in different cutting-edge research areas like supercapacitors electrode materials,solar cells and catalysts. Nickel and cobalt sulfides with various stoichiometries have been synthesized solvothermally from Ni(NO3)2 · 6H2O, Co(NO3)2 · 6H2O. This project revealed the preparation of Lanthanum doped Cobalt Nickel Sulphide (CNS) nanoparticles using solvothermal process and were characterized by X-ray powder diffraction, UV–Vis spectroscopy, Thermogravimetric Analysis and scanning electron microscopy ( SEM) XRD patterns of CoNi2S4 which shows the formation of Amorphous -CoNi2S4 which was indexed using the JCPDS card 24-0334 From SEM analysis it is observed that CoNi2S4 which was synthesized using solvothermal method was agglomerated and spherical in nature and La doping prevented the agglomeration and increased the size of the particles. UV-Vis Spectrum analysis were used to evaluate the optical behavior of the synthesized material in which 6% La doped CoNi2S4 exhibited the observed optical band gap of 3.63 eV. While Thermogravimetric Analysis shows that 3% La doped CoNi2S4 exhibit well retained thermal stability even at 650◦c.