期刊
MICROCHIMICA ACTA
卷 185, 期 12, 页码 -出版社
SPRINGER WIEN
DOI: 10.1007/s00604-018-3057-2
关键词
Ozoneinduction; Plasma assistance; Chemiluminescence; Cataluminescence; Volatile organic compounds; Sensor; Detector; Real-time monitoring; Deep oxidation; TiO2
资金
- National Natural Science Foundation of China [21605163, 21475153, 21775167]
- Guangdong Provincial Natural Science Foundation of China [2015A030311020, 2016A030313358]
- Special Funds for Public Welfare Research and Capacity Building in Guangdong Province of China [2015A030401036]
- Guangzhou Science and Technology Program of China [201604020165]
- Cultivation Project of Young Teacher in University [16lgpy25]
The authors describe a strategy for ozone-induction coupling with plasma assistance (O-3-I/PA) to enhance cataluminescence (CTL) based sensing of volatile organic compounds (VOCs). A homemade O-3-I/PA CTL sensor system was constructed based on this strategy. O-3-I/PA can significantly enhance the CTL response to many compounds that were hardly detectable previously with adequate sensitivity. Without any preconcentration, the limits of detection (for S/N=3) are 20g.m(-3) (= 5 ppbv) for toluene and 8g.m(-3) (6.4 ppbv) for formaldehyde. VOCs including benzene, alkanes, halohydrocarbons, alkenes alcohols, aldehydes, ketones and ethers are found to produce a strong response when using this sensor system. Mechanistic studies showed that the synergistic effect of ozone-induction and plasma assistance promote the oxidation of the VOCs under formation of CO2. This strongly favors CTL emission. The sensor system can be used as a direct-reading detector for on-line and real-time monitoring of total VOCs. It also can be used as a detector in gas chromatography for the identification of individual VOCs. It is perceived that this work paves the way to both a new kind of vapor sensor and to a detection scheme in gas chromatography.
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