Mo-SAN-03 - Engineering Opposing Response Evolution in ZnWO₄–WO₃ Sensor Pair for Deterministic Decoding of NO₂ in Reducing Gas
- Event
- EUROSENSORS 2026
2026-09-06 - 2026-09-09
Zurich - Band
- Poster
- Chapter
- Sensor Arrays And Networks, Integrated Systems
- Author(s)
- S. K. Singh, C. Neeraj, A. K. Dwivedi, V. B. Kamble - Indian Institute of Science Education and Research,Thiruvananthapuram (India)
- Pages
- 650 - 651
- DOI
- 10.5162/eurosensors2026/Mo-SAN-03
- ISBN
- 978-3-910600-12-6
- Price
- free
Abstract
The selective detection of NO 2 in a multicomponent gas environment is still limited by the cross-sensitivity of metal oxide sensors. In this study, a ZnWO 4 -WO 3 sensor pair is created by deliberately using opposing response trends under identical gas circumstances. In the presence of reducing gases such as CH 4 and CO, the reaction rate of ZnWO 4 decreases steadily. WO ₃ has a significantly higher reaction rate than pure NO ₂ , sometimes up to 3 times higher, depending on the interferent concentration. This contrast provides a structured response space in which the same NO 2 concentration generates different responses depending on the background gas combination. The distinction makes the dataset ideal for deterministic discrimination and for machine learning algorithms for classification and concentration estimation.