Detection of VOCs by microwave transduction using dealuminated faujasite DAY zeolites as gas sensitive materials

• Gas detection: a gas sensor can be seen as a sensitive material associated to a transduction method.
• Microwaves transduction: this technique estimates the dielectric characteristics evolution of a sensor.
• Sensors: low cost manufacture of the sensors.
• Sensitive materials: use of dealuminated faujasite DAY zeolite.
• Results: a resolution lower than 50 ppm for toluene detection is obtained at room temperature.

The gas sensing is an environmental topic representing a strong interest for this century. Whatever the purpose, industrial emissions control or indoor quality air supervision, the challenge remains to produce effective low costs detection systems adapted to the atmospheric conditions. This study focuses on the estimation of the microwaves transduction technique viability for the toluene detection. Sensors are based on zeolites powders, deposited on coplanar structures adapted to the microwave frequency range.We shall apply to explain the principles of the microwave transduction before approaching the conception of the sensors, the measurement protocol and the obtained results.