Synthesis and evaluation of nickel doped Co3O4 produced through hydrothermal technique

espanolLa sintesis de oxido de cobalto con dopaje de niquel al 4% se estudia en muestras obtenidas mediante tecnica hidrotermal. Despues del tratamiento termico final a 300°C, el analisis de difraccion de rayos X indico la formacion de oxido de cobalto espinela con una substitucion completa de niquel en la red. Se encontro un tamano promedio de cristalito de ~42 nm ~31 nm, asi como un tamano de particula de ~20 nm y ~30 nm para Co3O4 y Co3-xNixO4, respectivamente. Los parametros estructurales se establecieron mediante refinamiento Rietveld con una buena correspondencia entre el patron simulado y el experimental con valores de X2 = 1.25 y GOF = 0.90 para Co3O4. La brecha de banda de energia se encontro a traves de espectroscopia UV-Vis en dos regiones diferentes, los valores Eg1 y Eg2 varian entre 1.54 y 2.04eV para muestras dopadas con niquel. Los resultados SEM indicaron la formacion de nanoestructuras con forma semicubica y bastones irregulares. Parametros tales como el tamano del cristal, el tamano de particula, el area de superficie, asi como la morfologia del producto final dependen del dopaje EnglishThe synthesis of undoped cobalt oxide and cobalt oxide with 4%nickel doping is studied in samples obtained through hydrothermal technique. After the final heat treatment at 300°C, X-ray diffraction analysis indicated the formation of cobalt spinel oxide with a complete replacement of nickel in the lattice. An average crystallite size of ~42 nm and ~31nm was found, as well as a particle size of ~ 20 nm and ~30 nm for Co3O4 and Co3-xNixO4, respectively. Structural parameters were established through Rietveld refinement with a good correspondence between the simulated and the experimental pattern with values of x2 = 1.25 and GOF = 0.90 for Co3O4. The energy band gap was found through UV-Vis spectroscopy in two different regions: Eg1 and Eg2 values vary between 1.54 and 2.04eV for samples doped with nickel. The SEM results indicated the formation of nanostructures with semi-cubic shape and irregular rods. Parameters such as crystal size, particle size, surface area, as well as morphology of the final product depend on doping