A simple preparation process of pure Mn3-Xcoxo4 (X= 1, 1.5 and 2) desert rose-like nanoparticles and their optical properties.

Abstract

Monodisperse CoMn2O4, Co1.5Mn1.5O4 and Co2MnO4 nanoparticles were prepared by a rapid and low cost method. The organic and complex dispersing agent free synthesis of stable colloidal suspensions containing pure nanoparticles of spinel oxides was optimized at low temperature (T<100 °C). The key point of the synthesis is the fast introduction of the precursor solution into a much larger volume of alkaline solution buffered with LiOH. XRD, SEM-FEG and HRTEM performed on desert rose-like nanoparticles showed that nanoparticles are crystallized and of uniform shape/size distributions. Thermogravimetric analyses give an insight into the sample composition of nanopowders in relation with semiconductor ceramic counterparts. The UV-Vis absorption spectra of these pure spinel oxide nanoparticles in solution are discussed.