1. Ni-MOF-74 as sensing material for resonant-gravimetric detection of ppb-level CO.
- Author
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Lv, Yanqing, Xu, Pengcheng, Yu, Haitao, Xu, Jiaqiang, and Li, Xinxin
- Subjects
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NICKEL compounds , *METAL detectors , *GRAVIMETRIC analysis , *CARBON dioxide , *METAL-organic frameworks - Abstract
For the first time, ultrasensitive detection of 10 ppb CO has been realized using metal organic framework (MOF) crystals of Ni-MOF-74 as gravimetric-type sensing material with resonant microcantilever sensors. Due to the specific interaction between CO molecules and the active transitional metal centers of Ni 2+ in the Ni-MOF-74 crystal, the Ni-MOF-74 material with ultra-high surface area and nanoporous structure possesses large absorption capacity to CO gas. By loading the Ni-MOF-74 material onto the resonant microcantilever, the formed gravimetric sensor exhibits high-performance sensing to CO at trace level. The experimentally obtained limit of detection (LOD) of the sensor to CO reaches finer than 10 ppb (parts per billion in volume), which indicates an extremely high CO-detection sensitivity of the sensor. Besides the excellent sensitivity, the sensor also shows remarkable repeatability and long-term stability. Eight kinds of interfering gases are tested and a fine selectivity of the sensor is verified. This work indicates that MOF materials such as Ni-MOF-74 are promising in gravimetric-type gas sensing applications. [ABSTRACT FROM AUTHOR]
- Published
- 2018
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