Dielectric properties of bulk TiO2 nanowires prepared by hydrothermal method

In this study, TiO₂ nanowires with diameter of 20-23 nm was successfully synthesized using treatment of TiO₂ nanoparticle with concentrated sodium hydroxide at 150 °C for 6 hours. The dielectric properties of bulk TiO₂ nanoparticle, anatase TiO₂ nanowires (annealed at 500 °C) and rutile TiO₂ (annealed at 900 °C) was investigated. The crystallographic phase of TiO₂ was determined using X-ray diffraction (XRD). The morphology of the samples was observed by Field emission scanning electron microscopy (FESEM). The dielectric constant and the dielectric losses at room temperature were measured in the frequency range of 1Hz-1MHz. The dielectric constant of bulk TiO₂ nanoparticles, anatase TiO₂ nanowires and rutile TiO₂ nanowires measured at 1Hz were 50, 50 and 356, respectively.