Poly（ethylene glycol）（PEG） assisted hydrothermal route has been used to study the influence of the hydrolyzing agent on the properties of PEG-iron oxide（Fe3O4） nanocomposites.Iron oxide nanoparticles（NPs）,as confirmed by X-ray diffraction analysis,have been synthesized by a hydrothermal method in which Na OH and NH3 were used as hydrolyzing agents.Formation of PEG-Fe3O4 nanocomposite was confirmed by Fourier transform infrared spectroscopy（FTIR）.Samples exhibit different crystallite sizes,which estimated based on line profile fitting as 10 nm for NH3 and 8 nm for Na OH hydrolyzed samples.The average particle sizes obtained from transmission electron microscopy was respectively 174±3 nm for Na OH and 165±4 nm for NH3 gas hydrolyzed samples.Magnetic characterization results reveal superparamagnetic characteristics despite a large particle size,which indicate the absence of coupling between the nanocrystals due to the presence of polymer in the nanocomposites.The conductivity curve demonstrates that σDC is strongly temperature dependent.
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