Abstract
Co-doped titanate nanotubes (TNTs) with a nominal composition of CoxTi3−xO7(Na0.96H1.04 × 3.42H2O (where x = 0, 0.05, 0.1, 0.2, 0.3, and 0.4) were synthesized by a hydrothermal method at temperature of 130 °C for 24 h. The synthesized samples were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), X-ray photoemission spectroscopy (XPS), and vibrating sample magnetometry (VSM). The diameter and length of the nanotubes were found to be on the ∼7–10 nm and micrometer scales, respectively. Room temperature magnetization results indicate that undoped TNTs are diamagnetic whereas Co-doped TNTs are paramagnetic. XPS results suggest that the oxidation states of titanium and cobalt for undoped and Co-doped TNTs were Ti4+ and Co2+, respectively. All of the Co-doped TNTs exhibited a high dielectric constant of about 104–106 at 100 Hz at room temperature. Interestingly, the loss tangent tan δ of the Co-doped TNTs significantly decreased by a factor of 4 at 1 kHz, while the dielectric constant remained high.
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