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Flexible organic thin-film transistors (OTFTs) based on nitrogen dioxide gas sensors were developed using spin-coated Poly methyl methacrylate (PMMA) as gate dielectric layer and sprayed-coated poly(3-hexylthiophene) (P3HT)/graphene composite materials as active layer. Different mass ratio and film thickness of composite films of OTFTs were fabricated to optimize performance. Optimized flexible OTFT gas sensor exhibited typical transistor characteristics and higher sensitivity at room temperature. Besides, it can undertake 500 cycles mechanical distortion without big change of gas sensitive response u ), gas sensing response is only reduced by 30%. In this work, flexible OTFT gas sensors have excellent mechanical flexibility, and will broaden the range of flexible electronic devices.

P1FW.3 - Flexible organic thin-film transistors NO2 sensors based on poly(3-hexylthiophene)/graphene composite films