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Size and Shape Tailoring of Titania Nanoparticles Synthesized by Solvothermal Route in Different Solvents

Authors

  • Roman Alvarez Roca,

    Corresponding author
    • Department of Material Science and Engineering and Chemistry Department, Federal University of Sao Carlos, Sao Carlos, SP, Brazil
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  • Edson Roberto Leite

    Corresponding author
    • Department of Material Science and Engineering and Chemistry Department, Federal University of Sao Carlos, Sao Carlos, SP, Brazil
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Authors to whom correspondence should be addressed. e-mails: cortes116@yahoo.es and edson.leite@pq.cnpq.br

Abstract

A simple solvothermal low-temperature synthesis process of TiO2 nanoparticles was investigated in different solvents [Octanol (Oc), Ethanolamine (Am) and Terathane (Tr)] with titanium (IV) chloride (TiCl4) as precursor. The samples were characterized by X-Ray Diffraction (XRD) and Transmission Electron Microscopy (TEM). XRD showed the crystallite size ranging from 4 to 12 nm, which were calculated using Debye–Scherrer's equation. The existence of poor or high crystalline anatase phases and high crystalline anatase/rutile mixture was also shown. TEM images displayed variations in the morphological behavior depending on the synthesis condition. Particles of irregular morphology with high irregular agglomeration up to well-defined particles can be observed, which are self-assembled by oriented attachment (OA). This self-assembly led to TiO2 microparticles with 3-D Wulff shape for anatase and 1-D shape for rutile. The results showed that the TiO2 nanopowder could be easily engineered and adapted by the solvent type, the TiCl4 concentration and the synthesis time.

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