Selective Sensors of Nitrogen Dioxide Based on Thin Tungsten Oxide Films under Optical Irradiation
- Авторы: Almaev A.1, Yakovlev N.1, Chernikov E.1, Tolbanov O.1
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Учреждения:
- Tomsk State University
- Выпуск: Том 45, № 10 (2019)
- Страницы: 1016-1019
- Раздел: Article
- URL: https://journals.rcsi.science/1063-7850/article/view/208453
- DOI: https://doi.org/10.1134/S1063785019100171
- ID: 208453
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Аннотация
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.
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Об авторах
A. Almaev
Tomsk State University
Автор, ответственный за переписку.
Email: almaev_alex@mail.ru
Россия, Tomsk, 634050
N. Yakovlev
Tomsk State University
Email: almaev_alex@mail.ru
Россия, Tomsk, 634050
E. Chernikov
Tomsk State University
Email: almaev_alex@mail.ru
Россия, Tomsk, 634050
O. Tolbanov
Tomsk State University
Email: almaev_alex@mail.ru
Россия, Tomsk, 634050