Material for establishing solid state contact for ion selective electrodes

A method of forming an ion selective sensor comprising the steps of. providing an electrically conductive material;

• creating a redox couple including a portion of said electrically conductive material;
• coating said redox couple with a polymeric material having immobilized charged sites, said polymeric material carrying immobilized charged sites;
• and
• covering said polymeric material with an ion selective material.

An ion selective sensor comprising:

• an electrically conductive material providing a reference redox couple;
• a polymeric material provided on said electrically conductive material, said polymeric material having immobilized sites of charge opposite that of mobile ions involved in said redox couple;
• and
• an ion selective material covering said polymeric material.

A method of forming an ion selective sensor comprising the steps of:

• providing an electrically conductive material;
• creating a redox couple including a portion of said electrically conductive material;
• coating said redox couple with a polymeric material having immobilized sites of charge opposite that of mobile ions involved in said redox couple;
• and
• covering said polymeric material with an ion selective material.

A chemical responsive field effect transducer comprising:

• a layer of semiconductor material having a surface;
• a pair of first diffusion regions of a first doping characteristic at said surface;
• a second diffusion region of a second doping characteristic at said surface between said pair of first diffusion regions;
• an electrically insulating material provided on said surface;
• a polymeric material having immobilized charged sites provided on said electrically conductive material, said polymeric material carrying less than about 1.63×1021 immobilized charged sites per gram, said polymeric material separated from said diffusion regions by said insulating material;
• an ion selective material provided on said polymeric material;
• and
• an electrically insulating encapsulant sealing said transducer from a sample region while leaving exposed a region of said ion selective material for exposure to a sample.

A method of making a chemical responsive field effect transducer comprising:

• (a) providing a layer of semiconductor material having a surface;
• (b) doping a pair of first regions at said surface to provide a first doping characteristic therein;
• (c) doping a second region of said surface between said pair of first regions so as to provide a second doping characteristic therein;
• (d) covering said diffusion regions with an electrically insulating material;
• (e) providing a polymeric material adjacent said electrically insulating material, said polymeric material having immobilized charged sites and carrying less than about 1.63×1021 immobilized charged sites per gram;
• (f) covering said polymeric material with an ion selective material;
• and
• (g) encapsulating said transducer with an electrically insulating encapsulant so as to separate said transducer from a sample region while leaving exposed a region of said ion selective material for exposure to a sample.