Conjugated microporous polymers (CMPs) present high promise for chemiresistive gas sensing owing to their inherent porosities, high surface areas, and tunable semiconducting properties. However, the poor conductivity hinders their widespread application in chemiresistive sensing. In this work, three typical CMPs (PSATA, PSATB, and PSATT) are synthesized and their chemiresistive gas sensing performance is investigated for the first time. To further improve performance, PSATT are modified on the surface of amino‐functionalized multi‐walled carbon nanotubes (NH2‐MWCNTs) to improve the conductivity. As a result, the obtained material, PSATT‐7NC exhibited a high sensitivity of 9766% toward 4 ppm NO2, which is 2.5 times higher than that of pristine PSATT. It also demonstrated remarkable selectivity and excellent long‐term stability. Furthermore, the lowest limit of detection (0.79 ppb) among all polymers‐based sensors is achieved at a low operating temperature of 100 °C. This work provides a valuable strategy into the development of a new material platform for advancing high‐performance gas sensing applications.

中文翻译：

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通过集成碳纳米管提高共轭微孔聚合物的电导率，用于超灵敏的 NO2 化学电阻传感器


共轭微孔聚合物 （CMP） 由于其固有的孔隙率、高表面积和可调半导体特性，在化学电阻气体传感方面前景广阔。然而，较差的导电性阻碍了它们在化学电阻传感中的广泛应用。在这项工作中，合成了三种典型的 CMP （PSATA、PSATB 和 PSATT），并首次研究了它们的化学电阻气体传感性能。为了进一步提高性能，在氨基功能化多壁碳纳米管 （NH ₂ -MWCNT） 的表面对 PSATT 进行了改性，以提高导电性。结果，获得的材料 PSATT-7NC 对 4 ppm NO 表现出 9766% 的高灵敏度 ₂ ，比原始 PSATT 高 2.5 倍。它还表现出卓越的选择性和出色的长期稳定性。此外，在所有基于聚合物的传感器中，在 100 °C 的低工作温度下实现了最低的检测限 （0.79 ppb）。 这项工作为开发用于推进高性能气体传感应用的新材料平台提供了有价值的策略。