Sensor membrane of an optical sensor for the determination of a physical or chemical parameter of a sample

• Main Authors: WOLFBEIS, OTTO S., DR, KOVACS, BARNA, KLIMANT, INGO, LEINER, MARCO JEAN-PIERRE. DR, KARPF, HELLFRIED
• Format: Patent
• Language: English; French; German
• Published: 21.02.1996
• Edition: 5
• Subjects: ADHESIVES; CHEMISTRY; DYES; INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIRCHEMICAL OR PHYSICAL PROPERTIES; MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FORELSEWHERE; MEASURING; METALLURGY; MISCELLANEOUS APPLICATIONS OF MATERIALS; MISCELLANEOUS COMPOSITIONS; NATURAL RESINS; PAINTS; PHYSICS; POLISHES; TESTING

In a sensor membrane of an optical sensor for the determination of a physical or chemical parameter of a sample, containing, homogeneously immobilised in the polymer matrix of the sensor membrane, an indicator substance which is in at least indirect contact with the sample and changes at least one of its optical properties when the parameter to be measured changes, the indicator substance being in the form of an ion pair and comprising a cationic or anionic dye molecule and at least one counterion compensating for the electrical charge of the dye molecule, it is proposed that the counterion is derived from compounds containing an ionic group and a) an oligomer radical of the monomer on which the particular polymer matrix is based, b) long-chain alkyl or alkylene groups or c) silyl groups, where the counterion has physico-chemical properties matched to the physico-chemical properties of the polymer matrix, and the dye molecule is anchored in the polymer matrix via this counterion.