γ-Fe2O3/SiO2 Nanocomposites Obtained by Sol-Gel Synthesis

Abstract

Abstract: Nanocomposites with γ-Fe₂O₃ nanoparticles uniformly dispersed in silica matrix were successfully synthesized by using tetraethylorthosilicate (TEOS) as silica precursor and iron nitrate as ferric oxide precursor. However, when iron chloride was used as precursor, hematite was obtained in the final composite. It was found that the dried gels obtained at low temperatures (T < 400℃) were amorphous, when the dried gels were heat treated at 600℃, a lot of γ-Fe₂O₃ nanoparticles were formed, while a further increase of temperature resulted in γ to α-Fe₂O₃ transformation. The addition of acids to the sols resulted in a way to increase particle size and to narrow the particle size distribution of γ-Fe₂O₃inthe composite.

Key words: γ-Fe₂O₃/SiO₂, nanocomposites, sol-gel method

CLC Number:

TQ174

HUANG Xiang-Hui,CHEN Zhen-Hua. γ-Fe₂O₃/SiO₂ Nanocomposites Obtained by Sol-Gel Synthesis[J]. Journal of Inorganic Materials.

References

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γ-Fe₂O₃/SiO₂ Nanocomposites Obtained by Sol-Gel Synthesis

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