Mo-CHS-02 - Humidity Enhances the Isopropyl Alcohol Detection by Co-Mn Oxide
- Event
- EUROSENSORS 2026
2026-09-06 - 2026-09-09
Zurich - Band
- Poster
- Chapter
- Chemical Sensors
- Author(s)
- R. dos Santos Theodoro, D. P. Volanti - São Paulo State University,São José do Rio Preto (Brazil), M. D’Andria, A. T. Güntner, M. Pereira Martins - ETH Zurich,Zurich (Switzerland)
- Pages
- 392 - 393
- DOI
- 10.5162/eurosensors2026/Mo-CHS-02
- ISBN
- 978-3-910600-12-6
- Price
- free
Abstract
Humidity is a major challenge in metal oxide-based gas sensing, often compromising sensor performance and reliability.[1] Here, we report a p-type cobalt–manganese mixed oxide for the detection of isopropyl alcohol (IPA) at ppb-level concentrations under humid conditions. The sensing material was synthesized by flame spray pyrolysis.[2] Structural and morphological characterization was performed by X-ray diffraction and scanning electron microscopy (SEM). The sensor response to 1000 ppb IPA was evaluated at 310 °C under relative humidity levels ranging from 0 to 90%. Remarkably, the presence of humidity enhanced the sensor response, indicating a positive contribution of surface-adsorbed hydroxyl groups to the interaction with IPA. At 90% RH and 300 °C, the sensor achieved experimental and theoretical limits of detection (LODs) of 15.6 ppb and 53.4 ppt, respectively. These findings demonstrate that water vapor does not necessarily act as an interfering species but can promote VOC sensing. The Co–Mn oxide therefore offers a promising strategy for humidity-tolerant gas sensors targeting real-world applications.