Preparation and Characterization of Rod-like γ-Fe_2O_3 Nanoparticles

This paper presented a new method to prepare γ-Fe2O3 nanoparticles. After the reaction of FeCl3 with NaOH in the presence of polyethylene glycol(PEG-400), the precipitate was dried at 60℃ in air and then calcined at different temperatures for 1h. XRD, Mossbauer spectroscope, TEM, FTIR and TG-DTA were used to characterize the obtained samples. The results show that after the precipitate dried at 60℃ for 6h, a poor-crystalline γ-Fe2O3 powder forms, and calcined at 300℃ for 1h, the poor-crystalline powder turns to rod-like γ-Fe2O3 nanoparticles with aspect ratio about 5.