Tunability of impedance spectroscopy, electrical conductivity and optical properties of Cu-doped TiO2 nanostructures for optoelectronic device application.

This paper details the successful fabrication of Cu-doped TiO 2 nanostructures using a co-precipitation method. A thorough analysis of the structural and electrical characteristics of the nanostructure samples was carried out. It was found that all synthesized samples exhibited an anatase TiO 2 structure. The XRD pattern indicated an average crystalline size of 23.19 nm for Cu-doped TiO 2 nanostructures, whereas TiO 2 nanostructures showed a size of 11.78 nm. The UV-Visible spectrum indicated a noticeable absorption band shift towards longer wavelengths, coupled with an increased absorption rate of light. Analysis of electrical conductivity showcased temperature-dependent variations in conductivity at high frequencies. Impedance spectroscopy unveiled improved conductivity upon the integration of Cu into TiO 2 nanostructures. Nonetheless, at 300 K, copper doping resulted in a decline in electrical conductivity, whereas at elevated temperatures, Cu doping showed a increase in conductivity for the nanostructures samples. These findings underscore the potential and applicability of the nanostructures, showcasing improved AC conductivity and electrical characteristics, making them promising for various electrical applications. • Simple co-precipitation method were applied to synthesize Cu doped TiO 2 nanoparticles. • The XRD models show that weak X-ray reflections from Cu doped TiO 2 nanoparticles confirm the presence of the TiO 2 phase. • The average diameter of Cu doped TiO 2 nanoparticles between 12 and 25 nm. • The optical gap of Cu doped TiO 2 nanoparticles is estimated at around 3.3 eV. • Electrical conductivity analysis demonstrated temperature-dependent changes in conductivity at high frequencies. [ABSTRACT FROM AUTHOR]