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Detection of CO2 with (Hetero-) Polysiloxanes sensing layers by the change of work function at room temperature

 
: Stegmeier, S.; Fleischer, M.; Tawil, A.; Hauptmann, P.; Endres, H.-E.

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Postprint (PDF; )

Procedia chemistry. Online journal 1 (2009), No.1, pp.646-649
http://www.sciencedirect.com/science/journal/18766196
ISSN: 1876-6196
Eurosensors <23, 2009, Lausanne>
English
Journal Article, Conference Paper, Electronic Publication
Fraunhofer IZM-M
CO2-detection; polysiloxane; work-function-change; room temperature

Abstract
Zhou et al. and Endres et al. reported on CO2-sensing using primary amino groups of Heteropolysiloxanes at higher temperatures (50-70°C) by means of a mass sensitive and a capacitive readout. Based on this work the read out of the change in the work function is investigated. The reversible interaction of CO2 with spin-coated Heteropolysiloxanes sensitive layers results in changes of the work function with typical signal heights of 15-20 mV (from 400 ppm up to 4000 ppm). Results are presented regarding variations in the chemical nature of the films. This opens up the possibility for a new ambient temperature CO2-sensor which shows fast response times as well as a high sensitivity for concentrations exceeding 400 ppm CO2 (background in atmosphere).

: http://publica.fraunhofer.de/documents/N-112679.html