Influence of Synthesis Parameters on Magnetization and Size of Iron Oxide Nanoparticles

摘要

The effect of the synthesis parameters precursor concentration, reaction temperature, reaction time, and heating rate on the non-hydrolytic synthesis of iron oxide nanoparticles was studied via statistical design of experiment (DOE) methodology. The net sample magnetic moments were determined by fluxgate magnetorelaxometry (MRX). Multiple linear regression analysis provided an empirical model where the net magnetic moments solely depend on precursor concentration and reaction temperature. The correctness of net magnetic moments determined from MRX measurements was verified by static M-H measurements on three selected samples. Also, good agreement of the particle core sizes determined by TEM and by fitting static M-H curves with the Langevin function was found for these samples. A similar dependence on synthesis parameters was observed for sample core sizes and the net sample magnetic moments based on comparative measurements on the selected samples, indicating that the core sizes solely depend on precursor concentration and reaction temperature but not on reaction time and heating rate. On the other hand, an increase of reaction time causes a broadening of the core size distribution.