Example 2
A reaction solution was prepared by dissolving manganese (II) acetylacetonate acetate (Mn(CH3COCHCOCH2)2) and Cobalt (II) acetate tetrahydrate (Co(CH3COO)2.4H2O) in a mixture of oleic acid (OLAC) and 1-octadecene. The reaction solution had a molar ratio of 4.5 mol OLAC: mol Metal (Mn+Co) and a combined metal concentration of 0.9 mmol Mn/mL of 1-octadecene. The reaction solution was heated to a temperature of 130° C. under flowing nitrogen and held at 130° C. for 60 minutes. The mixture was then heated under an inert atmosphere of nitrogen at a rate of 10° C./min to reflux (320° C.). The reaction mixture was held at 320° C. for 120 min. The reaction mixture was cooled under an inert atmosphere using a flow of RT air to cool the exterior of the reaction vessel. The nanoparticles were collected and purified via repeated washing and decanting/centrifugation steps using hexane as a hydrophobic solvent, and isopropanol as a counter solvent. The purified nanoparticles were dispersed in toluene. TEM images illustrated that the nanoparticles are rod-shaped, have an average length of 64.1 with a length distribution of 15% and an average width of 11.7 nanometers with a width distribution of 13%.
