Characterization of γ-Fe2O3 nanoparticles prepared by transfor- mation of α-FeOOH |
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作者姓名: | MIAO Hua LI Jian LIN YueQiang LIU XiaoDong ZHANG QingMei FU Jun |
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作者单位: | School of Physics Science and Technology & MOE Key Laboratory on Luminescence and Real-Time Analysis, Southwest University, Chongqing400715, China |
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基金项目: | This work was supported by the National Natural Science Foundation of China (11074205). |
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摘 要: | γ-Fe2O3 nanoparticles were successfully synthesized by a chemically induced transformation of α-FeOOH.In this method,the precursor(α-FeOOH)was prepared by chemical precipitation,and then treated with a mixed FeCl2/NaOH solution to produce the nanoparticles.X-ray diffraction indicated that when the precursor was treated with FeCl2(0.22 mol/L)and NaOH(0.19 mol/L),pure γ-Fe2O3 nanoparticles were obtained.However,when the concentration of FeCl2 was<0.22 mol/L or the concentration of NaOH was<0.19 mol/L,α-FeOOH and γ-Fe2O3 phases co-existed in the nanoparticles.Transmission electron microscopy observations showed that in the samples with co-existing phases,the nanoparticles did not have identical morphologies.The pure γ-Fe2O3 nanoparticles were polygonal rather than spherical.The volume ratio of α-FeOOH and γ-Fe2O3 was estimated for the two-phase samples from magnetization data obtained from a vibrating sample magnetometer.This chemically induced transformation is novel,and could provide an effective route for the synthesis of other metal oxide nanocrystallites.
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关 键 词: | α-FeOOH γ-Fe2O3 FeCl2/NaOH solution transition nanoparticles |
收稿时间: | 2009-01-09 |
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