Microwave assisted synthesis of Co doped NiO nanoparticles and its fluorescence properties

Nanoparticles of Co doped NiO of the composition CoxNi1-xO(x=0, 0.03, 0.07, 0.10, 0.13, 0.15) have been successfully synthesized by microwave gel combustion method using citric acid as a chelating agent. The microstructural and compositional analyses have been carried out by XRD, TEM, FESEM and EDAX. The results of structural characterization shows the formation of Co doped Nickel oxide nanoparticles in single phase without any impurity. Particle size was estimated from XRD and Hall-Williamson relation and was found to increase with the increase in Co content. Fourier transform infrared spectra (FTIR) show the bonding relations of Co ions with the Ni lattice framework. Optical analyses were done by UVvisible absorption and fluorescence emission spectroscopy. The absorbance spectra depict an increasing tendency and corresponding decrease in the band gap with the dopant concentration. (C) 2016 Elsevier B.V. All rights reserved.