Abstract
In order to use chemically selective optode membranes in monolithically integrated optical sensors, the membrane's optical signal output ideally has to be in the near-infrared (NIR) wavelength range. Dyes showing light absorbance in the NIR range have been evaluated for their suitability as chromoionophores in plasticized poly(vinyl chloride) (PVC) membranes. The influence of the membrane plasticizer polarity on the optical properties and on the acidity of the dye has been investigated. It is shown that the p K a of the chromoionophore in the membrane phase can be shifted by changing the plasticizer polarity.
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