P5.11 - Cyclic optical activation of semiconducting gas sensors: influence of cycling frequency

T. Wagner, D. Klawinski, D. Meixner & C.-D. Kohl
Resistive semiconducting gas sensors are typically cost-efficient and highly sensitive devices. However, due to the detection mechanism based on oxidizing or reducing surface reactions they lack in inherent selectivity. To compensate this, different methods can be applied, as e.g. utilizing catalytic supplements or temperature cycled operation, each with its specific pros and cons. Here we present a new method based on the utilization of surface reaction kinetics by cyclic optical activation in the UV/Vis range....