Abstract
The sorption properties of organically modified silicates (Ormosil) and Ormosil/TEOS films were investigated using a capacitor system. The accuracy of the capacitance measurement was less than 0.05 pF. The capacitance variation obtained was converted to a form of the partition coefficient which is related to the sorption property of the detector materials. The sorption properties can be explained by the reactivity of hydrogen-bonds of the chemical groups in Ormosils. The Karhunen-Loeve expansion, which is a pattern recognition technique, was used to obtain information on the hydrogen-bonding interaction between Ormosils, Ormosil/TEOS and four different gases. The character of the sorption properties of Ormosils varied widely from basic (amino and cyano groups) to acidic (silanol group). The patterns of 4 Ormosils and TEOS from the viewpoint of the acidity and basicity are similar to those shown by other organic detection-coatings.
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