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. 2015 Mar 11;5:8939. doi: 10.1038/srep08939

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(a) A photo of the sensor to be measured; (b) variation of the resistance in air with UV-irradiation time; (c) variation of the sensitivity with measurement time involved in detecting the different concentrations of ethanol gas and (d) variation of the final sensitivity with UV-irradiation time. Response times of Film-1.0 are 6, 6, 7 and 8s in detecting 50, 100, 200 and 400 ppm ethanol gas, respectively. The recovery times are 8, 8, 6 and 6s, respectively. For other film sensors, the response time and the recovery time are all in the range of 3-8s.