Abstract

SARF, Fatma. Impurity Defect Induced Ferromagnetism Investigation of SiO₂-Supported NiO Particles. J. Mex. Chem. Soc [online]. 2022, vol.66, n.1, pp.34-41.  Epub Dec 05, 2022. ISSN 1870-249X.  https://doi.org/10.29356/jmcs.v66i1.1623.

This study examines amorphous SiO2-supported NiO particles by nickel concentration and calcination temperature arrangement to determine photoluminescence emission peaks and magnetic properties. Conventional co-precipitation with thermal calcination was used to produce NiO nanoparticles. Cubic NiO crystallization with single phase was improved by doubling the nickel concentration by calcination at 500 ºC and 600 ºC. Average crystalline size of 72 nm was obtained in the samples where double nickel concentration with calcination temperature at 600 ºC. Granular forms have been observed in all samples, and nickel clusters were shown in the samples where the nickel concentration is twice as high. Green band emission intensity increases with improved NiO crystallinity due to surface oxygen vacancies at 505 nm. It is interesting to observe ferrimagnetism for SiO2-supported NiO particles calcined at 500 ºC. From these results, optimal synthesis procedure and reduction in nucleation growth of NiO nanoparticles was achieved by double nickel concentration with calcination temperature at 600 ºC.

Keywords : Transition metal oxides; co-precipitation; photoluminescence; magnetism.