Optical and magnetic properties of Fe₂O₃/SiO₂ nano-composite films

Abstract

Fe₂O₃/SiO₂ nano-composite films were prepared by sol-gel technique combining heat treatment in the range of 100–900 °C. The particle size was observed by FE-SEM. Optical properties of the films were investigated by UV-visible spectra. Structural and magnetic characteristics were investigated through FT-IR and VSM. The transparency of the Fe₂O₃/SiO₂ nano-composite films decreased with the content of the Fe₂O₃. Water and organic solvent in the films were evaporated with heat treatment, so the transparency of the films was enhanced under high temperature. It is also found that the saturation magnetization (M _s) of the films increases with the temperature. As the content of the Fe₂O₃ increases, when the content of the Fe₂O₃ is around 30wt%, the M _s of the films has a maximum value.

Keywords

sol-gel technique / Fe₂O₃/SiO₂ nano-composite films / magnetism

References

[1] Solinas S., Piccaluga G., Morales M. P., . Sol-gel Formation of γ-Fe₂O₃/SiO₂ Nanocomposites[J]. Acta Mater., 2001, 49: 2508-2811.

[2] Wang Z. M., Zeng X. Y. Magnetic Properties of γ-Fe₂O₃ Nanoparticles Prepared by Laser Ablation[J]. Journal of Wuhan University of Technology-Mater. Sci. Ed., 2006, 21(4): 28-31.

[3] Zhang X., Guo H. Q., Chi N., . Mater. Self-aligned Magnetic Dipole Moments of Fe₂O₃ Formed within Sol-gel Matrix[ J]. Chem. Phys., 2006, 98: 207-211.

[4] Guo H., Zhang X. M., Cui M. H., . Mater. Magnetic Ordering of Ferric Oxide within SiO₂-based Mesoporous Materials[ J]. Res. Bull., 2005, 40: 1713-1725.

[5] Cannas C., Concas G., Falqui A., . Investigation of the Precorsors of γ-Fe₂O₃ in Fe₂O₃/SiO₂ Nanacomposites Obtained through Sol-gel[J]. J. Non-cryst., Solids., 2001, 286: 64-73.

[6] Battisha I. K., Afify H. H., Badr Y. Structural and Photoluminescence Behaviors of Nano-Structure Thin Film and Bulk Silica Gel Derived Glasses[J]. J. Sol-Gel Sci. Technol., 2002, 25: 5

[7] Hazan Y. D., Shter G. E., Cohen Y., . The Evolution of Microstructure in Nonhydrolytic Alumina Xerogels[J]. J. Sol-Gel Sci. Technol., 1999, 14: 233

[8] Brinker C. J., Hurd A. J., Frye G. C., . Sol-gel Thin Film Formation[J]. J. Non-Cryst. Solids., 1990, 121: 294

[9] Hong R. Y., Fu H. P., Di G. Q., . Facile Route to γ-Fe₂O₃/SiO₂ Nanocomposite Used as a Pecursor of Magnetic Fluid [J]. Mater. Chem. Phys., 2008, 108: 132-141.

[10] Yasumori Matsumoto H., Hayashi S., . Magneto-Optical Properties of Silica Gel Containing Magnetite Fine Particles[ J]. J. Sol-Gel Sci. Technol., 2000, 18: 249-2.