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Tracing of Ammonia Gas by Solution-Combustion-Derived Pristine and Nb-Doped TiO2 Films: Beneficial Impact of Crystallinity and Adsorbed Oxygen on the Gas Response.
- Source :
- Journal of Electronic Materials; Sep2023, Vol. 52 Issue 9, p6360-6377, 18p
- Publication Year :
- 2023
-
Abstract
- The current work delivers room-temperature ammonia (NH<subscript>3</subscript>) gas-detectable pristine, Nb-doped TiO<subscript>2</subscript> air- and vacuum-annealed films obtained through the solution-combustion process. Polycrystalline anatase crystal structured films without any dopant oxide phases were processed at 400°C on glass substrates. The crystallinity was higher in pristine films than in doped films; the morphological features were similar in all the films. The films were > 50% transparent, and the estimated optical energy band gap was greater in doped films than in pristine films. All the films detected NH<subscript>3</subscript> gas (25 ppm to 100 ppm) at room temperature, and the gas response was highly dependent on the crystallinity and relative area fraction of adsorbed oxygen (% of O<subscript>A</subscript>). The vacuum-annealed pristine film exhibited a better gas response than the other films at all NH<subscript>3</subscript> gas concentrations due to high crystallinity and % of O<subscript>A</subscript> (10.15%). The film demonstrated maximum gas response of ~16 towards 100 ppm of NH<subscript>3</subscript> gas and displayed good selectivity. Even though the doping reduced the crystallite size from ~17 nm to ~9 nm, it also diminished the crystallinity of the films, which significantly impacted the deterioration of their gas response. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 03615235
- Volume :
- 52
- Issue :
- 9
- Database :
- Complementary Index
- Journal :
- Journal of Electronic Materials
- Publication Type :
- Academic Journal
- Accession number :
- 169781611
- Full Text :
- https://doi.org/10.1007/s11664-023-10577-6