As one of the BTEX (benzene, toluene, ethylbenzene, xylene) from living environment, benzene has the greatest carcinogenic, anesthetic and neurotoxic effects. At the same time, due to its chemical inertness and nonpolar characteristics, benzene is also the most difficult to detect in BTEX. Herein, based on QCM (quartz crystal microbalance) platform, MOF-14, a metal-organic framework, is first employed to detect benzene vapor by the host − guest interaction of MOF with benzene molecule, as well as Lewis acid-base interaction. By comparing with other three types of MOF materials, it was found that the effect of the ligand on the adsorption is greater than that of the metal point of junction. On the other hand, the different steric hindrance effects in BTEX restrict their adsorption capacity. Thus, the MOF-14 modified QCM sensor exhibits high sensing performance to benzene vapor with a detection limit at the level of 150 ppb. Our studies also indicate that the sensor shows good selectivity to oppose various kinds of interfering gases. Even toluene has a structure similar to that of benzene, it also can be distinguished. And the measurements on repeatability and long-term stability are both approved for the excellent reliability of the MOF-14 modified QCM sensor. By using computational simulation, we explored that why benzene and toluene can be distinguished by MOF-14 modified QCM sensor. This work extended the usages of MOF based QCM for high performance benzene sensing.

作为生活环境中的BTEX（苯，甲苯，乙苯，二甲苯）之一，苯具有最大的致癌，麻醉和神经毒性作用。同时，由于其化学惰性和非极性特性，苯也是BTEX中最难检出的。在此，基于QCM（石英晶体微天平）平台，首先采用金属有机框架MOF-14通过MOF与苯分子的主体-客体相互作用以及路易斯酸碱相互作用检测苯蒸气。通过与其他三种MOF材料进行比较，发现配体对吸附的影响大于结金属点的影响。另一方面，BTEX中不同的位阻效应限制了它们的吸附能力。从而，MOF-14改进型QCM传感器对苯蒸气具有很高的感测性能，检出限为150 ppb。我们的研究还表明，该传感器具有很好的选择性，可以抵抗各种干扰气体。即使甲苯具有与苯相似的结构，也可以区分。重复性和长期稳定性的测量均被批准用于MOF-14改进型QCM传感器的出色可靠性。通过使用计算仿真，我们探索了为什么MOF-14改进型QCM传感器可以区分苯和甲苯。这项工作扩展了基于MOF的QCM在高性能苯传感中的用途。我们的研究还表明，该传感器具有很好的选择性，可以抵抗各种干扰气体。即使甲苯具有与苯相似的结构，也可以区分。重复性和长期稳定性的测量均被批准用于MOF-14改进型QCM传感器的出色可靠性。通过使用计算仿真，我们探索了为什么MOF-14改进型QCM传感器可以区分苯和甲苯。这项工作扩展了基于MOF的QCM在高性能苯传感中的用途。我们的研究还表明，该传感器具有很好的选择性，可以抵抗各种干扰气体。即使甲苯具有与苯相似的结构，也可以区分。重复性和长期稳定性的测量均被批准用于MOF-14改进型QCM传感器的出色可靠性。通过使用计算仿真，我们探索了为什么MOF-14改进型QCM传感器可以区分苯和甲苯。这项工作扩展了基于MOF的QCM在高性能苯传感中的用途。我们探索了为什么MOF-14改进型QCM传感器可以区分苯和甲苯。这项工作扩展了基于MOF的QCM在高性能苯传感中的用途。我们探索了为什么MOF-14改进型QCM传感器可以区分苯和甲苯。这项工作扩展了基于MOF的QCM在高性能苯传感中的用途。