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首页> 外文期刊>RSC Advances >Nanoporous MIL-101(Cr) as a sensing layer coated on a quartz crystal microbalance (QCM) nanosensor to detect volatile organic compounds (VOCs)
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Nanoporous MIL-101(Cr) as a sensing layer coated on a quartz crystal microbalance (QCM) nanosensor to detect volatile organic compounds (VOCs)

机译：纳米多孔MIL-101（Cr）作为传感层，涂覆在石英晶体微天平（QCM）纳米传感器上以检测挥发性有机化合物（VOC）

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摘要

The application of metal–organic frameworks (MOFs) as a sensing layer has been attracting great interest over the last decade, due to their high porosity and tunability, which provides a large surface area and active sites for trapping or binding target molecules. MIL-101(Cr) is selected as a good candidate from the MOFs family to fabricate a quartz crystal microbalance (QCM) nanosensor for the detection of volatile organic compound (VOC) vapors. The structural and chemical properties of synthesized MIL-101(Cr) are investigated by X-ray diffraction (XRD), Fourier-transfer infrared spectroscopy (FTIR) and scanning electron microscopy (SEM) and so on. A stable and uniform layer of MOF is coated onto the surface of a QCM sensor by the drop casting method. The frequency of the QCM crystal is changed during exposure to different concentrations of target gas molecules. Here, the sensor response to some VOCs with different functional groups and polarities, such as methanol, ethanol, isopropanol, n -hexane, acetone, dichloromethane, chloroform, tetrahydrofuran (THF), and pyridine under N _(2) atmosphere at ambient conditions is studied. Sensing properties such as sensitivity, reversibility, stability, response time, recovery time, and limit of detection (LOD) of the sensor are investigated. The best sensor response is observed for pyridine detection with sensitivity of 2.793 Hz ppm ~(?1) . The sensor shows short response/recovery time (less than two minutes), complete reversibility and repeatability which are attributed to the physisorption of the gases into the MOF pores and high stability of the device.
机译：在过去的十年中，由于金属-有机骨架（MOF）的高孔隙率和可调性，提供了较大的表面积和捕获或结合目标分子的活性位点，因此作为传感层的应用引起了人们的极大兴趣。 MIL-101（Cr）被选为MOFs系列的良好候选者，以制造用于检测挥发性有机化合物（VOC）蒸气的石英晶体微天平（QCM）纳米传感器。通过X射线衍射（XRD），傅里叶转移红外光谱（FTIR）和扫描电子显微镜（SEM）等手段研究了合成的MIL-101（Cr）的结构和化学性质。通过滴铸法将稳定且均匀的MOF层涂覆到QCM传感器的表面上。在暴露于不同浓度的目标气体分子期间，QCM晶体的频率会发生变化。在此，传感器在环境温度为N _（2）的情况下，对某些具有不同官能团和极性的VOC的响应，例如甲醇，乙醇，异丙醇，正己烷，丙酮，二氯甲烷，氯仿，四氢呋喃（THF）和吡啶被研究。研究了诸如灵敏度，可逆性，稳定性，响应时间，恢复时间和传感器的检测极限（LOD）之类的传感属性。对于吡啶检测，观察到最佳的传感器响应，灵敏度为2.793 Hz ppm〜（？1）。该传感器显示出较短的响应/恢复时间（不到两分钟），完全可逆性和可重复性，这归因于气体对MOF孔的物理吸附以及设备的高稳定性。

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