NEW PHOTOCURABLE COMPOSITION FOR ISFET POLYMER MEMBRANES

A new ion-selective membrane composition for an ISFET based on mono- a nd bifunctional methacrylates is developed; the membrane can be deposi ted and photolithographically structured on a wafer containing the ISF ETs. Compatibility of the polymer matrix with various plasticizers com monly used in PVC-based ion-selective membrane formulations is establi shed and it is shown that the membrane may hold up to 45% of different plasticizers. The characteristics of a calcium-sensitive ISFET with t he developed membrane are presented and the applicability of the photo curable polymer for potassium-sensitive membrane formation is shown.