Journal
MATERIALS RESEARCH BULLETIN
Volume 124, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.materresbull.2020.110772
Keywords
Sensor array; CNT; Non-self-sustaining discharge; Mechanism; Stability
Categories
Funding
- National Natural Science Foundation of China [61172040]
- National Natural Science Foundation of Shandong [ZR2016EEM39]
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The accurate detection of NO and SO2 emitted from fossil fuel power plants is critical for realizing the real-time control of clean combustion systems and environmental protection. An array of two CNT-based ionization sensors with different electrode separations is used to detect NO and SO2 in flue gas. The responses of each sensor show a monotone decreasing response, and are obviously separated but almost parallel. The decreasing response is attributed to strong consumption of N-2(A(3)Sigma u(+)) and N-2(a'(1)Sigma u(+)) in collision with SO2 or NO. And the separated and parallel responses in gas mixture indicates a good selectivity and the ability to simultaneously detect SO2 and NO concentrations with no other means. In addition, the array also have excellent long-term stability due to its non-self-sustaining discharge, which reducing the damage of CNTs caused by electrical breakdown. And the sensor has a fast response and recovery times of 8 s and 7 s, respectively.
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