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Environments 2017, 4(1), 20; doi:10.3390/environments4010020

Highly Sensitive and Selective VOC Sensor Systems Based on Semiconductor Gas Sensors: How to?

Lab for Measurement Technology, Department of Systems Engineering, Saarland University, Saarbrücken 66041, Germany
3S GmbH—Sensors, Signal Processing, Systems, Saarbrücken 66121, Germany
Author to whom correspondence should be addressed.
Academic Editors: Ki-Hyun Kim and Abderrahim Lakhouit
Received: 31 December 2016 / Revised: 21 February 2017 / Accepted: 24 February 2017 / Published: 1 March 2017
(This article belongs to the Special Issue Volatile Organic Compounds in Environment)
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Monitoring of volatile organic compounds (VOCs) is of increasing importance in many application fields such as environmental monitoring, indoor air quality, industrial safety, fire detection, and health applications. The challenges in all of these applications are the wide variety and low concentrations of target molecules combined with the complex matrix containing many inorganic and organic interferents. This paper will give an overview over the application fields and address the requirements, pitfalls, and possible solutions for using low-cost sensor systems for VOC monitoring. The focus lies on highly sensitive metal oxide semiconductor gas sensors, which show very high sensitivity, but normally lack selectivity required for targeting relevant VOC monitoring applications. In addition to providing an overview of methods to increase the selectivity, especially virtual multisensors achieved with dynamic operation, and boost the sensitivity further via novel pro-concentrator concepts, we will also address the requirement for high-performance gas test systems, advanced solutions for operating and read-out electronic, and, finally, a cost-efficient factory and on-site calibration. The various methods will be primarily discussed in the context of requirements for monitoring of indoor air quality, but can equally be applied for environmental monitoring and other fields. View Full-Text
Keywords: low-cost sensors; VOC sensor systems; sensitivity; selectivity; virtual multisensor; calibration low-cost sensors; VOC sensor systems; sensitivity; selectivity; virtual multisensor; calibration

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Schütze, A.; Baur, T.; Leidinger, M.; Reimringer, W.; Jung, R.; Conrad, T.; Sauerwald, T. Highly Sensitive and Selective VOC Sensor Systems Based on Semiconductor Gas Sensors: How to? Environments 2017, 4, 20.

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