School of Materials Science and Engineering, Xinjiang University, Urumqi, Xinjiang 830046, China.
School of Physics Science and Technology, Xinjiang University, Urumqi 830046, China.
ACS Sens. 2024 Nov 22;9(11):5866-5874. doi: 10.1021/acssensors.4c01399. Epub 2024 Nov 12.
-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)). 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.
-甲基吡咯烷酮（NMP）是一种优秀的高级溶剂，人体易吸收，具有易燃、易爆的特点。为降低风险，需要对 NMP 的环境浓度进行测量。通过改变三氟甲磺酸钪（Sc(OTf)）催化下的合成时间，在室温下成功合成了一系列由亚胺键连接的共价有机框架（COF）。通过 XRD、FT-IR、XPS、SEM、TEM 和 BET 对合成时间对样品性能的影响进行了比较。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，进而影响气体传感性能。传感器结果表明，所有样品对 NMP 都具有良好的传感性能，其中合成 48 小时的样品具有最佳的传感性能，检测限为 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的比表面积、氢键相互作用、静电吸引和高缺陷。该研究为 NMP 检测提供了一种有效方法，并扩展了 COF 材料的应用范围。
