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Drift reduction of organic coated gas-sensors by temperature modulation

: Roth, M.; Hartinger, R.; Faul, R.; Endres, H.-E.

Weetall, H.H. ; National Institute of Standards and Technology -NIST-:
6th International Meeting on Chemical Sensors 1996. Proceedings
Amsterdam: Elsevier, 1996 (Sensors and actuators. B Chemical)
pp.358-362 (Part 2)
International Meeting on Chemical Sensors (IMCS) <6, 1996, Gaithersburg/Md.>
Conference Paper
Fraunhofer IFT; 2000 dem IZM eingegliedert
CO2; cross sensitivity; drift; gas sensor; interdigital capacitor; temperature profile

Drift effects and cross sensitivities seriously hinder the application of numerous sensor coatings based on organic or organically modified substances. A temperature modulated mode of sensor operation is investigated to reduce or overcome drift and humidity influence on organic gas-sensitive coatings. The transducers are interdigital capacitance structures with ring heater (IDC). As sensitive material a CO2 sensitive organically modified heteropolysiloxane is used. Heteropolysiloxanes are well known materials for gas-sensing, however, they also have common weaknesses of organic sensor coatings. Using different kinds and patterns of temperature modulation together with adapted signal-processing we were able to greatly reduce long time drift effects and diminsh cross-sensitivities.