Wang Yaru, Wang Zhaolong, Gao Yangfan, Yan Jun, Chen Yunlin, Yang Liu
School of Physical Science and Engineering, Beijing Jiaotong University, Beijing, 100044, China.
School of Physical Science and Engineering, Beijing Jiaotong University, Beijing, 100044, China.
Talanta. 2024 Sep 1;277:126383. doi: 10.1016/j.talanta.2024.126383. Epub 2024 Jun 6.
Chemical warfare agents (CWAs) are toxic that pose a threat to the environment and human health, even trace amounts of CWAs can be fatal. In view of this, there is an urgent need to develop gas sensors for trace detection and ultrafast response of CWAs. Herein, an optical gas sensor has been proposed based on metal-organic frameworks (MOFs) three-dimensional (3D) photonic crystal to detect trace CWAs' simulant (dimethyl methylphosphonate, DMMP) in different atmospheric humidity (RH 20 %, RH 40 %, RH 60 %, RH 80 %). At relative humidity (RH) of 20 %, the sensor shows excellent selectivity of DMMP due to the specific interactions of van der Waals force between UiO-67 and phosphoryl oxygen (OP) group of DMMP (CHOP), the ultrahigh sensitivity (42.7 ppb), ultrafast response (0.5 s) are profit from the ordered superstructure of 3D photonic crystal and its complete photonic bandgap. At higher humidity (RH 40%-80 %), the sensor shows excellent stability, long-term repeatability, and it still keeps ultrahigh sensitivity (12.1 ppb), ultrafast response (0.49 s) for DMMP at RH 80 %. Moreover, an optical gas sensor array has been prepared to solve the problem of cross-sensitive between DMMP and other CWAs at highest humidity (RH ≥ 80 %), the average classification accuracy can reach 98.6 %.
化学战剂（CWAs）具有毒性，会对环境和人类健康构成威胁，即使是痕量的化学战剂也可能致命。鉴于此，迫切需要开发用于痕量检测和对化学战剂进行超快响应的气体传感器。在此，基于金属有机框架（MOFs）三维（3D）光子晶体提出了一种光学气体传感器，用于检测不同大气湿度（相对湿度20%、40%、60%、80%）下痕量化学战剂模拟物（甲基膦酸二甲酯，DMMP）。在相对湿度（RH）为20%时，由于UiO - 67与DMMP的磷酰氧（OP）基团（CHOP）之间存在范德华力的特定相互作用，该传感器对DMMP表现出优异的选择性，其超高灵敏度（42.7 ppb）、超快响应（0.5秒）得益于3D光子晶体的有序超结构及其完整的光子带隙。在较高湿度（RH 40% - 80%）下，该传感器表现出优异的稳定性、长期重复性，并且在RH 80%时对DMMP仍保持超高灵敏度（12.1 ppb）、超快响应（0.49秒）。此外，还制备了一种光学气体传感器阵列，以解决在最高湿度（RH≥80%）下DMMP与其他化学战剂之间的交叉敏感问题，平均分类准确率可达98.6%。
