Abstract
Organic electronics fabricated using flexible and lightweight conjugated polymers show substantial potential for use in wearable device applications. Nonetheless, the inherently poor carrier transport characteristics of conjugated polymer semiconductors are a prevalent organic-electronics constraint that limits the sensitivities and response rates of organic gas sensors. In this study, we adhered to the principles of green chemistry and developed high-performance, cost-effective organic gas sensors by introducing stable and conductive porous carbon materials derived from chlorinated polyvinyl chloride (cPVC) into a poly(3-hexylthiophene) (P3HT) matrix. We then investigated how carbonization temperature and the presence of active potassium hydroxide (KOH) in the precursor affect sensing performance. Organic field-effect transistor (OFET) gas sensors manufactured using porous carbon obtained by carbonizing cPVC with KOH at 900 °C (referred to as “K9”) exhibited the best sensing performance, with an eight-fold increase in sensitivity to NO2 gas compared to that of the pristine P3HT-based sensor; it also demonstrated selective NO2-sensing performance in the presence of other oxidizing gases.
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