were recorded on a thermo nicolet nexus 670 ft ir tga was performed under a nitrogen atmosphere at a heating rate of 10 u00b0 c min using a perkin elmer tgs 2 instrument tem images were recorded on a philips cm12 tem 120 kv a drop of cofe 2 o 4 nanoparticle solution was placed onto a carbon coated copper grid and left to dry at room temperature magnetic measurements were carried out using an ade technologies dms model 10 vsm ferrimagnetic cofe 2 o 4 nanoparticles were synthesized using a modified thermal decomposition method 2 mmol fe acac 3 1 mmol co acac 2 10 mmol 1 2 hexadecanediol 6 mmol oleic acid 6 mmol oleylamine and 20 ml of benzyl ether were combined and mechanically stirred under a flow of n 2 the mixture was heated to 200 u00b0 c for 2 h and then under a blanket of n 2 heated to reflux u02dc 300 u00b0 c for 1 h the resulting black colored mixture was cooled to ambient temperature next 40 ml of ethanol was added to the mixture and the resulting black material was precipitated and separated via centrifugation at 6000 rpm for 10 min the black precipitate was.