Ozone sensing properties of NbO₂ thin films for health and safety applications

Abstract

This work investigates the ozone sensing properties of NbO 2 thin films operating at room temperature. NbO 2 thin films have been deposited on alumina and glass substrates provide with Cu interdigitated electrodes by the Vacuum Thermal Evaporation technique. The optical properties of NbO 2 thin films were explored using CARY 1E UV-Visible Spectrophotometer. The values of the optical band gap E OPT are estimated in view of the Mott and Davis' theory. The electrical response has been measured by exposing the sensing layers to ozone (ppb). NbO 2 films fabricated by this method have shown good sensitivity to envinronmentally relevant ozone concentrations.

Redox exfoliated NbS2: characterization, stability, and oxidation

“…49 Besides, the broad range of this band could be a result of a mixture of different morphologies of the formed material or a mixture of Nb-oxides (including NbO 2 ). 53 It is important to mention that the band observed at around 278 nm (diamond in Fig. 7a) could not be analyzed once the extinction (absolute value) actually drops with time.…”