He Weisi, Li Qian-Wen, Chen Sijie, Liu He, Cheng Zhonghua, Li Shuang, Lyu Wei, Xu Gang, Chen Yong-Jun, Liao Yaozu
State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Materials Science and Engineering, Donghua University, Shanghai, 201620, China.
State Key Laboratory of Structural Chemistry, Fujian Provincial Key Laboratory of Materials, and Techniques toward Hydrogen Energy, Fujian Institute of Research on the Structure of Matter, the Chinese Academy of Sciences, Fuzhou, Fujian, 350002, P. R. China.
Small. 2025 Apr;21(13):e2407880. doi: 10.1002/smll.202407880. Epub 2024 Dec 18.
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 (NH-MWCNTs) to improve the conductivity. As a result, the obtained material, PSATT-7NC exhibited a high sensitivity of 9766% toward 4 ppm NO, 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.
共轭微孔聚合物（CMPs）因其固有的孔隙率、高比表面积和可调节的半导体性能，在化学电阻式气体传感方面具有很高的应用前景。然而，其导电性较差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CMPs（PSATA、PSATB和PSATT），并首次研究了它们的化学电阻式气体传感性能。为了进一步提高性能，在氨基功能化多壁碳纳米管（NH-MWCNTs）表面对PSATT进行改性以提高导电性。结果，所得到的材料PSATT-7NC对4 ppm NO表现出9766%的高灵敏度，这比原始的PSATT高2.5倍。它还表现出显著的选择性和出色的长期稳定性。此外，在100°C的低工作温度下实现了所有基于聚合物的传感器中的最低检测限（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型材料平台提供了有价值的策略。
