Synthesis And Characterization Of CO3O4 Nanoparticles

摘要

We report the synthesis, microstructure and EPR of Co3O4 (spinel structure with a = 0.808 nm) nanoparticles. Urea-based combustion method with Co nitrate precursor has been developed and fiiel-to-oxidizer ratio is used as a control parameter to investigate how lattice parameter, particle size and EPR susceptibility vary with *P = 0.75 to 1.25. The average crystallite size estimated from the XRD vaiies from 7 to 14 nm in accord with those deduced from BET surface area measurements. Optical and FT-IR spectra confirmed formation of pure CO3O4 and provided band gap estimates, SEM micrographs give visual evidence for increased porosity upon increasing W. EPR spectra has yielded the paramagnetic susceptibility corroborated by VSM measurement.