Impact of Cu on structural, optical, dielectric properties and antibacterial activity of TiO2 thin films

In this work, Copper-doped TiO2 thin films were synthesized on glass substrates using a sol-gel dip-coating technique with varied molar concentrations of copper precursor (1,3,5,7,9 at. wt. %). Cu affected the structural, morphological, dielectric, antibacterial, and optical properties of TiO2 films. The formation of the anatase phase was confirmed by XRD. The morphology of all synthesized thin films was spherical grains with slight aggrega-tion. The hopping process explained dielectric characteristics that obeyed the Maxwell-Wagner model and Koop's theory. These films were ideal for high-frequency devices because of their low dielectric constant. It was observed that as Cu concentration increased, the optical band gap energy reduced, which was beneficial for improving solar cell efficiency. Cu-doped TiO2 produced the best antibacterial agent. The photocatalysts with the highest photo activities were those containing 9 wt% Cu. The increased light absorption in the UV-VIS range and the lower recombination rate of the photoinduced electron hole pair of Cu-doped TiO2 thin films were responsible for the improved photocatalytic activity. Methylene blue degraded in the presence of sunshine, making it a potential material for the treatment of water.

Automated summary

In this study, copper-doped titanium dioxide thin films were synthesized on glass substrates using a sol-gel dip-coating technique. The addition of copper affected the structural, morphological, dielectric, antibacterial, and optical properties of the films. The copper-doped films showed low dielectric constant, making them ideal for high-frequency devices, and the optical band gap energy decreased with increasing copper concentration, improving the efficiency of solar cells. Moreover, the copper-doped films exhibited enhanced photocatalytic activity, which could be potentially applied in water treatment.