Electrical and structural characterisation of nanostructured titania coatings deposited on interdigitated electrode system

This paper presents the electrical properties of La- and Nb-doped nanostructured titanium dioxide (TiO2) thin coatings deposited on the alumina substrate with gold electrodes in the interdigitated form to obtain appropriate devices for sensor application. Electrical parameters such as conductivity σ and permittivity ɛ were calculated using measured values of phase angle θm, capacitance Cm and resistance Rm. These values were measured using an HP-4194A Impedance/Gain-Phase Analyzer with a Z-probe in the frequency range from 103 Hz to 108 Hz. The measured results showed that with addition of 2, 4 or 6 at% of lanthanum, conductivity and permittivity of analysed samples are decreasing, whereas the addition of niobium in the same percentage follows the opposite trend.