Metal-oleate precursors

Apart from solvothermal methods, thermolysis of precursors in higli boiling solvents, the sol-gel method, hydrolysis and use of micelles have been employed to synthesize the metal oxide nanocrystals. Thus, Park et al. have used metal-oleates as precursors for the preparation of monodisperse Fe,0, MnO and CoO nanocrystals. 1-Octadecene, octyl ether and trioctylamine have been used as solvents. Hexagonal and cubic CoO nanocrystals can be prepared by the decomposition of cobalt acetylaceto-... 

The precursors used for the iron oxide nanocrystal synthesis via the heat-up method are various iron carboxylatc complexes, including the most widely used iron-oleate complex. Generally, when heated, metal carboxylatc complexes thermally decompose at temperatures near 300°C or higher to produce metal oxide nanocrystals along with some byproducts, such as CO, CO2, H2, water, ketones, esters, and various hydrocarbons. It is thought that the decomposition reaction proceeds via the formation of thermal See radicals liom metal carboxylatc (26, 27) ... 

Interest in iron carbonyl as a precursor for nanomaterials has been revived during the past decade such that, in 2001, Hyeon et al. reported the synthesis of monodisperse 4—16 nm Y-Fe203 nanocrystals from iron pentacarbonyl in octyl ether in the presence of either oleic or lauric adds as surface ligands [68]. In this approach, highly reactive Fe(CO)5 first formed iron-oleate complexes, the subsequent decomposition of which at 300 ° C led to the formation of transient metallic iron spedes or strongly reduced iron oxocomplexes, followed by their oxidation to the y-FezOs phase by introducing (CH3)3NO into the reaction mixture. 

---