N-methylpyrrolidone (NMP) is an excellent advanced solvent that can be easily absorbed by the human body and has the characteristics of flammability and explosion. To reduce the risk, the environmental concentrations of NMP need to be measured. A series of covalent organic frameworks (COF) connected by an imine bond have been successfully prepared at room temperature by changing the synthesis time catalyzed by scandium(III) trifluoromethanesulfonate (Sc(OTf)₃). The effect of the synthesis time on the sample properties was compared by XRD, FT-IR, XPS, SEM, TEM, and BET. The results showed that synthesis time had almost no effect on the morphology, specific surface area, and functional groups of the COF samples but had a significant impact on the pore size distribution, residual bonds, and other defects, which in turn affected the gas sensing performance. The sensor results showed that all samples had good sensing performance for NMP, among which the sample synthesized for 48 h had the best sensing performance, with a limit of detection of 692 ppb and good stability and repeatability. The excellent performance of the COF samples benefits from the large specific surface area, hydrogen bonding interactions, electrostatic attraction, and high defects. This study provides an effective method for NMP detection and expands the application range of the COF materials.

中文翻译：

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源自 COF 材料的受控传感器用于有效检测 N-甲基吡咯烷酮


N-甲基吡咯烷酮（NMP）是一种优良的高级溶剂，易被人体吸收，具有易燃易爆的特点。为了降低风险，需要测量 NMP 的环境浓度。通过改变三氟甲磺酸钪 （III） 催化的合成时间，在室温下成功制备了一系列由亚胺键连接的共价有机框架 （COF）（Sc（OTf）₃）。通过 XRD、FT-IR、XPS、SEM、TEM 和 BET 比较合成时间对样品特性的影响。结果表明，合成时间对COF样品的形貌、比表面积和官能团几乎没有影响，但对孔径分布、残余键和其他缺陷有显著影响，进而影响气感性能。传感器结果表明，所有样品对NMP的传感性能均较好，其中合成48 h的样品传感性能最佳，检出限为692 ppb，具有良好的稳定性和重复性。COF 样品的优异性能得益于大比表面积、氢键相互作用、静电吸引力和高缺陷。本研究为NMP检测提供了一种有效的方法，并扩展了COF材料的应用范围。