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Influence of silica ratio on structural and optical properties of SiO2/TiO2 nanocomposites prepared by simple solid-phase reaction

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Abstract

TiO2/SiO2 (Ti–O–Si) nanocomposite were prepared by a simple solid-phase reaction under natural atmosphere at 500 °C after the incorporation of silica (SiO2) nanoparticles, in TiO2 with varying the percentage weight of silica in the mixture (20, 30 and 50%). X-ray diffraction (XRD) and transmission electron microscopy (TEM) were used to characterize the phase purity, particle size and morphology. UV–vis absorption spectroscopy and optical density measurements (DO) allowed us to investigate the optical properties of our samples and to determine some crucial parameters such as the band gap energy Eg and the optical density DO. By the same, the band gap energy Eg achieves higher values as well as the optical density decreases for all the used wavelengths. These observations results from the formation of the Ti–O–Si bond and the presence of amorphous silica around anatase, which would impede the growth of TiO2 particles. The internal microstructure thus obtained will perform the stability of our composite allowing an enhancement of optical, electrical and catalytic features of TiO2.

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Acknowledgements

The authors would like to acknowledge contribution from Madani Salaheddine and Zarrouk Nafae for their collaboration.

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Authors and Affiliations

  1. Laboratoire de Physique des Matériaux et des Nanomatériaux Appliqués à l’Environnement, Faculté des Sciences de Gabès, Cité Erriadh Manara Zrig, 6072, Gabès, Tunisia

    M. Madani & K. Omri

  2. Companie des Phosphates de Gafsa, Centre des Recherches de Metlaoui, 2130, Metlaoui, Tunisia

    N. Fattah

  3. ISSAT de Gabès, Rue Omar Ibn el Khattab, 6072, Gabès, Tunisia

    A. Ghorbal

  4. CIMAP CEA/CNRS/ENSICAEN/UCBN, 6 Blvd. Maréchal Juin, 14050, Caen Cedex 4, France

    X. Portier

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  1. M. Madani
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  2. K. Omri
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  3. N. Fattah
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  4. A. Ghorbal
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  5. X. Portier
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Correspondence to M. Madani.

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Madani, M., Omri, K., Fattah, N. et al. Influence of silica ratio on structural and optical properties of SiO2/TiO2 nanocomposites prepared by simple solid-phase reaction. J Mater Sci: Mater Electron 28, 12977–12983 (2017). https://doi.org/10.1007/s10854-017-7129-6

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  • DOI: https://doi.org/10.1007/s10854-017-7129-6

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