期刊
ADVANCED FUNCTIONAL MATERIALS
卷 30, 期 50, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.202006598
关键词
impedance spectroscopy; metal-organic framework; nanoporous; near-zero power; NO2
类别
资金
- U.S. Department of Energy's National Nuclear Security Administration [DE-NA0003525]
Detection and capture of toxic nitrogen oxides (NOx) is important for emissions control of exhaust gases and general public health. The ability to directly electrically detect trace (0.5-5 ppm) NO(2)by a metal-organic framework (MOF)-74-based sensor at relatively low temperatures (50 degrees C) is demonstrated via changes in electrical properties of M-MOF-74, M = Co, Mg, Ni. The magnitude of the change is ordered Ni > Co > Mg and explained by each variant's NO(2)adsorption capacity and specific chemical interaction. Ni-MOF-74 provides the highest sensitivity to NO2; a 725x decrease in resistance at 5 ppm NO(2)and detection limit <0.5 ppm, levels relevant for industry and public health. Furthermore, the Ni-MOF-74-based sensor is selective to NO(2)over N-2, SO2, and air. Linking this fundamental research with future technologies, the high impedance of MOF-74 enables applications requiring a near-zero power sensor or dosimeter, with the active material drawing <15 pW for a macroscale device 35 mm(2)with 0.8 mg MOF-74. This represents a 10(4)-10(6)x decrease in power consumption compared to other MOF sensors and demonstrates the potential for MOFs as active components for long-lived, near-zero power chemical sensors in smart industrial systems and the internet of things.
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