Abstract
Gas sensors based on organic semiconductor have recently attracted much attention due to their inherent advantages, especially excellent flexibility and good selectivity. However, the gas species identification with high sensing response remains a key subject for organic gas sensors. Herein, a ZnPc single nanobelt field-effect transistor with the gas dielectric was fabricated and exhibited excellent gas sensing performance at room temperature. The sensors show the high response with 220% to 10 ppm NO2 and 3566% to 20 ppm H2S, and the low detection limit down to 50 ppb towards NO2/H2S, which surpass most reported room-temperature organic-based NO2/H2S sensors. Further, our single device realized accurate gas selective identification among NO2, SO2 and H2S with 92% success ratio in LDA feature space.
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