Resumo

RIAZIAN, Mehran. Electrical properties and enhancement of photocatalytic activity of TiO₂ nanorods doped with SiO₂. S.Afr.j.chem. (Online) [online]. 2017, vol.70, pp.189-199. ISSN 1996-840X.  http://dx.doi.org/10.17159/0379-4350/2017/v70a26.

Fabrication and characteristics of silicon oxide-doped titania nanorods by use of the sol-gel method and alkaline treatment (corrosion process) in base reflux is presented. Nanostructural properties and electrical properties of titania-synthesized nanorods are specified by use of FE-SEM (field emission scanning electron microscopy), AFM (atomic force microscopy), TEM (transmission electron microscopy), XRD (X-ray diffraction), Ultraviolet-visible spectroscopy and FT-IR (Fourier transform infrared spectroscopy). The degradation rate of methylene blue (MB) under UV radiation is investigated as an amount of photocatalytic activity. Dependence between photocatalytic activity and calcination temperature (CT) is determined. Dielectric constant, capacity, quality factor and resistance are measured. Moreover, the presence of silicon oxide dopant and thermal treatment on phases of crystallites, nanoparticle surface aspects, dielectric constant, electrical resistance and lattice investigation are studied. The results indicate that the photodegradation rate of MB by pure titania nanorods decreases as the CT increases also, the photocatalytic activity of nanorods can be enhanced by doping with SiO₂. Dielectric investigations reveal that dielectric constant and quality factor of pure nanorods can be improved by doping and increasing the CT.

Palavras-chave : Photocatalytic activity; dielectric; titania nanorods; doping; silicon oxide.

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