Wang Sa, Fu Yu, Wang Ting, Liu Wansheng, Wang Jian, Zhao Peng, Ma Heping, Chen Yao, Cheng Peng, Zhang Zhenjie
College of Chemistry, State Key Laboratory of Medicinal Chemical Biology, Nankai University, Tianjin, 300071, China.
Key Laboratory of Advanced Energy Materials Chemistry, Ministry of Education, Nankai University, Tianjin, 300071, China.
Nat Commun. 2023 Nov 9;14(1):7261. doi: 10.1038/s41467-023-42959-z.
The development of fast-response sensors for detecting NH at room temperature remains a formidable challenge. Here, to address this challenge, two highly robust Hoffmann-type metal-organic frameworks are rationally applied as the NH sensing materials which possess ultra-high static adsorption capacity for NH, only lower than the current benchmark material. The adsorption mechanism is in-depth unveiled by dynamic adsorption and simulation studies. The assembled interdigital electrode device exhibits low detection limit (25 ppb) and short response time (5 s) at room temperature, which set a record among all electrical signal sensors. Moreover, the sensor exhibits excellent selectivity towards NH in the presence of 13 other potential interfering gases. Prominently, the sensor can stably output signals for more than two months at room temperature and can be recovered by simply purging nitrogen at room temperature without heating. This study opens up a way for reasonably designing gas sensing materials for toxic gases.
开发用于在室温下检测氨气的快速响应传感器仍然是一项艰巨的挑战。在此，为应对这一挑战，两种高度稳健的霍夫曼型金属有机框架被合理地用作氨气传感材料，它们对氨气具有超高的静态吸附容量，仅低于当前的基准材料。通过动态吸附和模拟研究深入揭示了吸附机制。组装的叉指电极装置在室温下表现出低检测限（25 ppb）和短响应时间（5秒），这在所有电信号传感器中创下了记录。此外，该传感器在存在其他13种潜在干扰气体的情况下对氨气表现出优异的选择性。突出的是，该传感器在室温下可以稳定输出信号两个多月，并且可以通过在室温下简单地吹扫氮气而无需加热来恢复。这项研究为合理设计有毒气体的气敏材料开辟了一条道路。
