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26 September 1995 Glassy spectral gas sensors based on the immobilized indicators
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A number of color absorption and luminescence indicators being dispersed within a porous matrix have been investigated by means of spectral techniques. As a support for the indicator molecules served a mesoporous silica glass of Vycor type (pore size of 7.5 nm) which was transparent to the light and permeable to the ambient gases and vapors. The selected immobilized indicators have revealed the well-defined spectral sensitivity to certain components of an atmosphere or other gas mixture. After a proper chemical and thermal treatment these indicators have gained high selectivity of spectral response on an individual gas appearing in the ambients, the observed spectral changes have demonstrated its reversibility. The indicators immobilized within the porous glass turned out to be mostly advantageous as applied in the colorimetric sensors and anlyzyers, sepcifically in the automated remote air monitoring systems. Some of the essential parameters of the developed portable individual gas analyzers and remote multicomponent monitoring systems with use of fiber optic guides are reported.
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Alexander F. Novikov and Vladimir I. Zemskii "Glassy spectral gas sensors based on the immobilized indicators", Proc. SPIE 2550, Photodetectors and Power Meters II, (26 September 1995);

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