Material for establishing solid state contact for ion selective

Details Material for establishing solid state contact for ion selective Material for establishing solid state contact for ion selective

1997-09-08

1999-06-15

Tung, T.

Chemistry: electrical and wave energy

Apparatus

Electrolytic

204416, 2057875, 2057895, 427 58, G01N 27333

Patent

active

059118628

ABSTRACT:
A polymeric material which to form a stable, reproducible interface between the ionic and electronic domains of an ion selective sensor, or an ion selective field effect transistor, or the like is provided. When employed in an ion selective sensor, the polymeric material is advantageously provided over a solid internal reference electrode and an ion selective membrane is provided thereover. According to one embodiment, the polymeric material of the invention includes less than about 1.63.times.10.sup.21 immobilized charged sites per gram (less than about 2.72 millaequivalents/gram). According to another embodiment, the polymeric material includes immobilized sites of charge opposite that of mobile ions involved in the redox couple. A preferred polymeric material comprises a copolymer of methacrylamidopropyltrimethylammoniumchloride and methylmethacrylate. In a particularly advantageous embodiment, the ion selective membrane has little or no plasticizer.

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