Abstract Organic thin-film transistor (OTFT) based nitrogen dioxide (NO2) gas sensors were fabricated by utilizing blend film as active layer, which was composed by poly (3-hexylthiophene-2,5-diyl) (P3HT) and hydroxylated multi-walled carbon nanotubes (OH-MWCNTs). By optimizing the blend ratios (P3HT/OH-MWCNTs), the sensitivity of OTFTs to 30 ppm NO2 is up to 1320 %, while the pristine P3HT device is only 96 %, realizing a ca. 10 times enhancement. The OTFTs with P3HT/OH-MWCNTs blend active layer also exhibit excellent selectivity for NO2 against CO, NH3 and. H2S. By investigating the morphologies and microstructures of blend films via atomic force microscope, optical microscopy and UV–vis spectrophotometer, the improvement of sensing performance was mainly attributed to more gaps between the P3HT aggregations with the introduction of OH-MWCNTs, which was beneficial to the diffusion and adsorption of NO2. This work demonstrates that OH-MWCNTs can be applied in the field of OTFT by simple solution method for realizing high sensing performance gas sensor.

中文翻译：

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基于有机薄膜晶体管的高性能二氧化氮传感器，利用 P3HT/OH-MWCNTs 混合膜

摘要 利用由聚（3-己基噻吩-2,5-二基）（P3HT）和羟基化多羟基化合物组成的共混膜作为活性层，制备了基于有机薄膜晶体管（OTFT）的二氧化氮（NO2）气体传感器。壁碳纳米管（OH-MWCNTs）。通过优化混合比（P3HT/OH-MWCNTs），OTFTs 对 30 ppm NO2 的灵敏度高达 1320%，而原始 P3HT 器件仅为 96%，实现了约 10倍增强。具有 P3HT/OH-MWCNTs 混合活性层的 OTFT 也表现出对 NO2 对 CO、NH3 和的优异选择性。硫化氢。通过原子力显微镜、光学显微镜和紫外-可见分光光度计研究共混膜的形态和微观结构，传感性能的提高主要归因于引入 OH-MWCNTs 后 P3HT 聚集体之间的更多间隙，有利于 NO2 的扩散和吸附。这项工作表明，OH-MWCNTs 可以通过简单的解决方法应用于 OTFT 领域，以实现高传感性能的气体传感器。