Synthesis on an ultra large scale of nearly monodispersed γ-Fe2O3 nanoparticles with La(III) doping through a sol–gel route assisted by propylene oxide
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Nearly monodispersed La3+ doped γ-Fe2O3 nanoparticles were synthesized on an ultra-large scale of about 60 g in a single reaction by a low temperature sol–gel route. The nanoparticles were obtained by the reaction of FeCl2 and La(NO3)3 in ethanol solution with propylene oxide to form the sol, followed by the boiling of the sol solution. The La3+ doping promotes the phase transformation temperature of γ-Fe2O3 nanoparticles from 350 to 650 °C by the La3+ doping induced enhancement of phase transformation activation energy. This large scale synthesis strategy offers important advantages over other conventional routes for the preparation of undoped and doped γ-Fe2O3 nanoparticles. These guarantee the promising application of this route in the industrial production.
KeywordsSol–gel Doped γ-Fe2O3 Nanoparticles Phase transformation Large scale
We gratefully acknowledge Rumeng Wang, Xuemin Li, Xiaojuan Wang and Chenglan Wu for their diligent work in the laboratory. This work is supported by National Natural Science Foundation of China (20971107) and Shandong Provincial Science and Technology Project (2006GG2206009).