Abstract
Herein, a new and simple method for synthesis of Co2SiO4 nanostructures at low temperature is reported. The nanostructures are obtained by solvothermal reaction of Co(CH3COO)2·4H2O with tetraethyl orthosilicate (TEOS) in methanol solvent at 120–150°C for 8–12h, followed by calcination at 700°C for 5h. Effects of using polymer, molar ratio of Co:Si, reaction time and temperature are optimized to achieve the best products on morphology and purity. It is the first time that optical property and also the effects of using the polymer on properties of the cobalt orthosilicates are investigated. At the temperature of 150°C for a 12h period of time, when the molar ratio of Co:Si is 1:1, the product is rod-shape Co2SiO4 with diameters of 20–40nm. A mixture of the rod-shape and spherical structures of the Co2SiO4, with diameters of 20–40nm, is obtained by using of ratio of 2:1 of Co:Si at 150°C for 12h. With decreasing reaction time to 10h, the spherical clusters of the Co2SiO4 are prepared. The Co2SiO4 nanostructures are characterized by XRD, SEM and TEM to analyze their structure and morphology. The optical and magnetic properties of the nanostructures are investigated.
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