Charge sensitive fluid sensor for chemical and biological applications

A new field-effect transistor based transducer concept is presented, for measuring both, liquid and gaseous media. It uses a Faraday cup with a floating electrode inside, which is connected to the gate of a MOS like transistor. The SOI based technological realization allows a new degree of freedom for more flexible measurements as compared to conventional FET based transducers. Potentiometric measurements are presented. Additionally the SOI technology allows simple packaging.