Systematic Optimization of NO<sub>2</sub> Detection Using Activated Carbon-Based Resistive Sensors
Gas sensors play a crucial role in detecting harmful environmental gases. This study focuses on optimizing a resistive sensing layer for nitrogen dioxide (NO2) detection at room temperature (RT = 25 °C), based on commercial activated carbon (AC). NO2 sensing was assessed over a dynamic concentration range from 1 to 20 ppm. The impact of cycle time, interdigitated electrode gap, NO2 gas flow rate, synthetic air purge rate and saturation on sensor response was examined. NO2 sensing proceeded by adsorption, facilitated by the porosity and high surface area of AC. Sensing capability is reversible, suggesting purely physical adsorption. A response limit close to 65% was observed at sensor saturation. This work highlights the potential of commercially available AC as a practical solution for environmental NO2 monitoring, even in the absence of any additional chemical modification.
Authors
- Vanessa Fierro (ORCID: https://orcid.org/0000-0001-7081-3697)
- Jean Zaraket
- Proscovia Kyokunzire (ORCID: https://orcid.org/0000-0002-5572-3156)
- Alain Celzard (ORCID: https://orcid.org/0000-0003-0073-9545)
Institutions
- Institut Universitaire de France (FR)
- Centre National pour la Recherche Scientifique et Technique (CNRST) (MA)
- Institut Jean Lamour (FR)
- Université de Lorraine (FR)
Publication Details
- Journal
- ACS Applied Electronic Materials
- Published
- 2025-03-07
- DOI
- https://doi.org/10.1021/acsaelm.4c02151
- Citations
- 8
- Primary Topic
- Gas Sensing Nanomaterials and Sensors
- Type
- article
- Field-Weighted Citation Impact
- 5.84
Funders
- Ministère de l'Education Nationale, de l'Enseignement Superieur et de la Recherche