APPLICATION OF ION SELECTIVE FIELD EFFECT TRANSISTOR FOR HYDROGEN ION MEASUREMENT SYSTEM

Ibrahim Elkhier Hussien Arfeen, Abdul Rasoul Jabar Kizar Alzubaidi

Abstract


This paper aims to study field effect transistors as chemical sensor used for monitoring hydrogen ion concentration (H+) measurement in chemical analysis and environment fields, to detect the pH of the subjected solution. The Ion-Selective Field Effect Transistor (ISFET) sensor sensitivity depends mainly on the choice of the gate dielectric material (Silicon Nitride Membrane). The Ion-Selective Field Effect Transistor is (ISFET) used in places where fragile glass electrodes will be damaged. The interface circuit supplies the sensor with a constant current and voltage. The pH value is identified from the output voltage of the circuit. From the results, the system can be used for measuring the pH values in the range of pH4 to pH14. The function of the electronic circuit is to convert input current from sensor (ISFET) which represents pH value to a proportional output voltage. Design has been tested by a standard buffer solution and five kinds of aqueous solution and obtained the desired results. The relationship between the results obtained by electronic circuit and value of hydrogen ion for some aqueous solution has been plotted.

Keywords


Transistor, Chemical Sensor, Ion-Selective Field Effect Transistor, pH, Electronic Circuit.

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