Abstract
Cobalt doped TiO2 nanotubes are prepared by the combination of sol-gel process with hydrothermal treatment. The morphology and crystalline structure of TiO2 nanotubes are characterised by transmission electron microscopy (TEM) and X-ray diffraction respectively. Optical studies are done by UV-Vis reflectance spectra and photoluminescence spectra (PL). Co doping induces a structural transformation from anatase to rutile. PL spectrum shows the presence of surface oxygen vacancies and self trapped excitons in Co doped and undoped TiO2 nanotubes. Co doped sample show a peak in PL spectrum at 526 nm, which is not in the undoped sample. An AC conductivity data analysis is carried out in the temperature range 303 to 423 K for the TiO2 nanotubes and Co doped TiO2 nanotubes. The temperature at which the transition to the positive temperature coefficient of resistance occurs differs in undoped and Co doped TiO2 nanotubes.
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