Paper Info
Title
Facile Quantification and Identification Techniques for Reducing Gases over a Wide Concentration Range Using a MOS Sensor in Temperature-Cycled Operation.
Abstract
Dedicated methods for quantification and identification of reducing gases based on model-based temperature-cycled operation (TCO) using a single commercial MOS gas sensor are presented. During high temperature phases the sensor surface is highly oxidized, yielding a significant sensitivity increase after switching to lower temperatures (differential surface reduction, DSR). For low concentrations, the slope of the logarithmic conductance during this low-temperature phase is evaluated and can directly be used for quantification. For higher concentrations, the time constant for reaching a stable conductance during the same low-temperature phase is evaluated. Both signals represent the reaction rate of the reducing gas on the strongly oxidized surface at this low temperature and provide a linear calibration curve, which is exceptional for MOS sensors. By determining these reaction rates on different low-temperature plateaus and applying pattern recognition, the resulting footprint can be used for identification of different gases. All methods are tested over a wide concentration range from 10 ppb to 100 ppm (4 orders of magnitude) for four different reducing gases (CO, H-2, ammonia and benzene) using randomized gas exposures.
Year
DOI
Venue
2018
10.3390/s18030744
SENSORS
Keywords
Field
DocType
MOS gas sensor,temperature-cycled operation,differential surface reduction,quantification,sensitivity,selectivity,linear calibration
Orders of magnitude (numbers),Analytical chemistry,Benzene,Ammonia,Reaction rate,Calibration curve,Engineering,Conductance,Selectivity,Time constant
Journal
Volume
Issue
ISSN
18
3.0
1424-8220
Citations 
PageRank 
References 
0
0.34
1
Authors
4
Name
Order
Citations
PageRank
Caroline Schultealbert100.34
Tobias Baur227519.65
Andreas Schütze3153.57
t sauerwald4132.74