UV-activated room temperature metal oxide based gas sensor attached with reflector

A UV light enhanced gas sensor with light reflector was designed and fabricated. Compared with that without reflector, the sensor with reflector had higher efficiency of UV light absorption and utilization. The sensor with reflector exhibited higher response to ethanol than that without reflector at room temperature. The response of the sensor with reflector to 100 ppm ethanol was about 160 under UV illumination. Moreover, the response and recovery kinetics were obviously improved, and the response and recovery time were 50 s and 150 s, respectively. Such obvious improvement on the sensing performance for the sensor can be ascribed to the increasing of the optical path length in the sensing material layer, due to the introduction of the reflector.