Abstract
Composite film and bilayer film based on poly(3-hexylthiophene) (P3HT)/[6,6]-phenyl C61 butyric acid methyl ester(PC61BM) were firstly utilized as active layers of OTFT sensor. By comparing with electrical and sensing properties of these different devices for ammonia (NH3) at room temperature, the device based on PC61BM/P3HT composite film exhibited the optimum characteristics. The recovery value of PC61BM/P3HT composite film reached 93.9% of its initial value at 20ppm NH3 within 9min, which was improved by 75.5% in comparison with the one based on pristine P3HT film. In addition, the sensing mechanisms of all sensors were studied as well.
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