Solid state ion sensor with polyimide membrane

Details Solid state ion sensor with polyimide membrane Solid state ion sensor with polyimide membrane

1993-10-14

1995-05-23

Gorgos, Kathryn

Chemistry: electrical and wave energy

Apparatus

Electrolytic

204418, 257253, 257414, 435817, G01N 2726

Patent

active

054178355

ABSTRACT:
A polyimide matrix is employed to form a substance-sensitive membrane which is particularly suited for installation on a solid state sensor. Polyimide, dissolved in a solvent, such as N,N-dimethylformamide, or N-methyl-2-pyrrolidone (polyimide encapsulant), is combined with an ionophore, plasticizer, and a lipophilic additive. The ionophore may be a calcium ionophore, an ammonium ionophore, or any other ionophore. The membrane may also incorporate, or may be covered by, a bioactive agent, such as an enzyme, an immunochemical, bacteria, antibody, virus, or antigen. The plasticizer is one or both of dimethyl phthalate and diethylene glycol dibenzoate. The lipophilic additive may be potassium tetrakis(p-chlorophenyl)borate. The resulting substance-sensitive membrane has electrochemical properties which compare favorably to those of conventional PVC membranes, and exhibit significantly greater adhesion to glasses and semiconductor substrate materials. The improved adhesion may prolong the life of the sensors and prevent the formation of electrolyte shunts which have been known to render solid state sensors inoperative.

REFERENCES:
patent: 4020830 (1977-05-01), Johnson et al.
patent: 4486292 (1984-12-01), Blackburn
patent: 4613422 (1986-09-01), Lauks
patent: 4871442 (1989-10-01), Yamaguchi et al.

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