当前位置: X-MOL 学术Cryst. Growth Des. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
A Benzimidazole-Containing Covalent Organic Framework-Based QCM Sensor for Exceptional Detection of CEES
Crystal Growth & Design ( IF 3.2 ) Pub Date : 2019-05-01 00:00:00 , DOI: 10.1021/acs.cgd.9b00409
Zi-Hao He 1 , Shi-Da Gong 2 , Song-Liang Cai 1, 3 , Yi-Lun Yan 1 , Gui Chen 1 , Xin-Le Li 3 , Sheng-Run Zheng 1 , Jun Fan 1 , Wei-Guang Zhang 1
Affiliation  

Mustard gas poses a substantial concern for homeland security, and the development of sensors for facile, rapid, highly sensitive, and selective detection of a mustard gas simulant is much desirable. Herein, a new benzimidazole-containing covalent organic framework (COF), termed BABE-TFPy COF, was synthesized by the Schiff base condensation of 1-(4,7-bis(4-aminophenyl)-1H-benzoimidazole-2-yl)ethan-1-ol (BABE) with 1,3,6,8-tetrakis(4-formylphenyl)pyrene (TFPy). By virtue of its crystallinity, high porosity, excellent chemical stability, and abundant accessible benzimidazole sites, an unprecedented COF coated quartz crystal microbalance (QCM) sensor was judiciously fabricated for the detection of various volatile organic compounds (VOCs). Remarkably, the resultant BABE-TFPy COF coated QCM sensor exhibited significantly higher sensitivity to 2-chloroethyl ethyl sulfide (CEES), a typical hazardous mustard gas simulant, than those of the other common VOCs. Moreover, the frequency changes of the COF coated QCM sensor were linearly related to the concentrations of CEES vapor within the range of 5.6–19.7 ppm, and derived a strikingly low detection limit of 0.96 ppm (signal-to-noise ratio = 3), rendering it an extraordinary QCM sensor for the detection of CEES. The enthalpy change indicated by the temperature-varying microgravimetric experiment, along with the Gaussian theoretical calculation, highly suggests a dual-hydrogen bonding formed between the BABE-TFPy COF and the CEES molecule accounts for such an exceptional recognition of CEES.

中文翻译:

基于苯并咪唑的基于共价有机框架的QCM传感器,用于CEES的异常检测

芥子气引起了国土安全的极大关注,因此非常需要开发用于快速,快速,高度灵敏和选择性检测芥子气模拟物的传感器。本文中,通过1-(4,7-双(4-氨基苯基)-1 H的席夫碱缩合反应,合成了一种新的含苯并咪唑的共价有机骨架(COF),称为BABE-TFPy COF。-苯并咪唑-2-基)乙-1-醇(BABE)与1,3,6,8-四(4-甲酰基苯基)py(TFPy)。凭借其结晶度,高孔隙率,出色的化学稳定性和丰富的苯并咪唑位点,我们明智地制作了前所未有的COF涂层石英晶体微天平(QCM)传感器,用于检测各种挥发性有机化合物(VOC)。值得注意的是,所得BABE-TFPy COF涂层QCM传感器对2-氯乙基乙基硫化物(CEES)(一种典型的危险芥子气模拟物)的敏感性比其他常见VOC显着更高。此外,涂覆有COF的QCM传感器的频率变化与CEES蒸气浓度在5.6-19.7 ppm范围内线性相关,得出的检测极限极低,为0.96 ppm(信噪比= 3),使其成为用于检测CEES的非凡QCM传感器。随温度变化的微重力实验表明的焓变以及高斯理论计算结果高度表明,BABE-TFPy COF与CEES分子之间形成的双氢键说明了对CEES的出色识别。
更新日期:2019-05-01
down
wechat
bug