Critical Analysis of Ion Detection Using Semiconductor Field Effect Devices: Consequences for Chemical and Biomedical Applications

Abstract

Biosensors represent a great improvement for medical diagnosis. Miniaturization, cheapness and speed of many diagnostic methods and clinical procedures used every day can be easily adapted. Among the different types of biosensors we highlight the ones based on field effect transistors (FET), more specifically the extended gate field effect transistors (EGFET). This work presents an analysis of the procedures of measurement. Fluorine tin oxide (FTO) thin films were tested as H+ ion sensitive membrane used in the extended gate of an EGFET, which can become a part of a biosensor in the future.

ITO/Glass as Extended-Gate of FET: A Low-Cost Method for Differential pH-Sensing in Alkaline Solutions

“…18,19 z E-mail: naser.mokhtarifar@imtek.de In this case, commercially available metal-oxide-semiconductor fieldeffect transistors (MOSFETs) can be utilized 20,21 to reduce the fabrication expenses. 22 Consequently, EGFETs are considered as disposable sensors. 23,24 Indium tin oxide (ITO) is a well-known conductive semiconductor which is widely used as an optically transparent electrode in displays and other optoelectronic devices.…”