W8.2.3 - Selective Optical and Chemoresistive H2 Sensors by Nanosecond Pulsed Laser Annealing of Sol?Gel VO2 Films
- Event
- EUROSENSORS XXXVII
2025-09-07 - 2025-09-10
Wroclaw - Band
- Lectures
- Chapter
- W8.2 - Biochemical and Life-Science Sensors
- Author(s)
- M. Basso, E. Colusso, M. Cattelan, E. Napolitani, A. Martucci - University of Padova and INSTM, Padova (Italy), V. Paolucci, V. Ricci, C. Cantalini - University of L’Aquila, L’Aquila (Italy)
- Pages
- 196 - 197
- DOI
- 10.5162/EUROSENSORS2025/W8.2.3
- ISBN
- 978-3-910600-07-2
- Price
- free
Abstract
Nanosecond Pulsed Laser Annealing (ns-PLA) is a promising technique to simultaneously crystallize and nanostructure metal oxides films. Here, high nanostructured surface area was achieved on sol-gel VO₂ thin films by ns-PLA. The gas sensing tests showed excellent selectivity toward H₂, low operating temperatures of 150°C, detection limit as low as 2 ppm, and long-term stability over 500 h. Advanced in-operando GIXRD and in-situ XPS proved that the sensing mechanism involves reversible structural and chemical changes, based on reversible variations of V oxidation state and HₓVO₂ bronze formation.