Selective Sensors of Nitrogen Dioxide Based on Thin Tungsten Oxide Films under Optical Irradiation
| Autor: | Nikita N. Yakovlev, O. P. Tolbanov, E. V. Chernikov, A. V. Almaev |
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| Rok vydání: | 2019 |
| Předmět: |
010302 applied physics
Materials science Physics and Astronomy (miscellaneous) Analytical chemistry 02 engineering and technology Sputter deposition Atmospheric temperature range 021001 nanoscience & nanotechnology 01 natural sciences Tungsten trioxide Concentration ratio chemistry.chemical_compound chemistry Chemisorption 0103 physical sciences Limiting oxygen concentration Irradiation Thin film 0210 nano-technology |
| Zdroj: | Technical Physics Letters. 45:1016-1019 |
| ISSN: | 1090-6533 1063-7850 |
| DOI: | 10.1134/s1063785019100171 |
| Popis: | It is shown that NO2 present in air, beginning at a concentration of 1 ppm, can be selectively detected by sensors based on Au/WO3:Au thin films activated by laser diode radiation with maximum intensity at 400 nm instead of constant heating. The radiation-activated photodesorption reduces the time of sensor response to NO2. A high humidity of air under conditions of room-temperature irradiation additionally increases the device sensitivity to NO2 due to the appearance of additional adsorption sites. The absence of a sensor response to reducing gases and varying oxygen concentration in the atmosphere is caused by the photodesorption of chemisorbed $${\text{O}}_{2}^{ - }$$ species during their interaction with holes generated in intrinsic optical transitions in the near-surface region of WO3 film. |
| Databáze: | OpenAIRE |
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