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Detecting Volatile Organic Compounds in the ppb Range with Gas Sensitive Platinum gate SiC-Field Effect Transistors
Linköping University, Department of Physics, Chemistry and Biology, Applied Sensor Science. Linköping University, The Institute of Technology. Saarland University, Saarbruecken, Germany. (Applied Sensor Science & Dept. of Mechatronics Lab for Measurement Technology)
Linköping University, Department of Physics, Chemistry and Biology, Applied Sensor Science. Linköping University, The Institute of Technology. (Applied Sensor Science)
Linköping University, Department of Physics, Chemistry and Biology, Applied Sensor Science. Linköping University, The Institute of Technology. (Applied Sensor Science)ORCID iD: 0000-0002-2817-3574
Saarland University, Saarbruecken, Germany. (Dept. of Mechatronics Lab for Measurement Technology)
2014 (English)In: IEEE Sensors Journal, ISSN 1530-437X, E-ISSN 1558-1748, Vol. 14, no 9, 3221-3228 p.Article in journal (Refereed) Published
Abstract [en]

In this paper, the use of a platinum gate gas-sensitive SiC field-effect transistor (SiC-FET) was studied for the detection of low concentrations of hazardous volatile organic compounds (VOCs). For this purpose, a new gas mixing system was realized providing VOCs down to sub-parts per billion levels with permeation ovens and gas predilution. Benzene, naphthalene, and formaldehyde were chosen as major indoor air pollutants and their characteristics are briefly reviewed. Measurements have shown that the selected VOCs can be detected by the SiC-FET in the parts per billion range and indicate a detection limit of ~1 ppb for benzene and naphthalene and ~10 ppb for formaldehyde in humid atmospheres. For 10-ppb naphthalene at 20% r.h., the sensor response is high with 12 mV, respectively, a relative response of 1.4%. Even in a background of 2-ppm ethanol, the relative response is still 0.3%. Quantification independent of the humidity level can be achieved using temperature cycled operation combined with pattern recognition, here linear discriminant analysis. Discrimination of benzene, naphthalene, and formaldehyde is also possible.

Place, publisher, year, edition, pages
2014. Vol. 14, no 9, 3221-3228 p.
Keyword [en]
Indoor air quality, trace level, benzene, naphthalene, formaldehyde, linear discriminant analysis
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:liu:diva-113289DOI: 10.1109/JSEN.2014.2326693ISI: 000346791700038OAI: oai:DiVA.org:liu-113289DiVA: diva2:780753
Available from: 2015-01-15 Created: 2015-01-15 Last updated: 2017-12-05Bibliographically approved

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Bur, ChristianAndersson, MikeLloyd Spetz, Anita

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