Preparation of functionalized Fe_(1-x)Pd_x based nanoparticles. Magnetic characterization

摘要

Oleic acid/oleylamine capped Fe_(1-x)Pd_x (x=0.16, 0.20, 0.25) nanoparticles have been synthesized using a diol as reducing agent in order to get nanoparticles of different average sizes and coatings. Composition and morphology were analyzed by infrared spectroscopy (IR), X-Ray Diffraction (RXD), thermogravimetry (TG) and Transmission Electron Microscopy (TEM). Well dispersed nanoparticles with uniform sizes between 3 and 8 nm and average diameters less than 6 nm were obtained. Magnetic properties were investigated by Electron Magnetic Resonance (EMR) and magnetization measurements. Most of the nanoparticles were superparamagnetic at physiological temperature with low magnetic saturation values (near 5 emu.g~(-1) alloy/0.4 Nβ per Fe atom). SAR measurements were also performed with the aim of carrying out hyperthermia measurements but the nanoparticles did not work as magnetic heaters.