Fabrication of robust and cost-efficient Hoffmann-type MOF sensors for room temperature ammonia detection

Sa Wang, Yu Fu, Ting Wang, Wansheng Liu, Jian Wang, Peng Zhao, Heping Ma, Yao Chen, Peng Cheng and Zhenjie Zhang ()
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Sa Wang: Nankai University
Yu Fu: Xi’an Jiaotong University
Ting Wang: Nankai University
Wansheng Liu: Nankai University
Jian Wang: Nankai University
Peng Zhao: Nankai University
Heping Ma: Xi’an Jiaotong University
Yao Chen: Nankai University
Peng Cheng: Nankai University
Zhenjie Zhang: Nankai University

Nature Communications, 2023, vol. 14, issue 1, 1-9

Abstract: Abstract The development of fast-response sensors for detecting NH3 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 NH3 sensing materials which possess ultra-high static adsorption capacity for NH3, 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 NH3 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.

Date: 2023
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DOI: 10.1038/s41467-023-42959-z

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