The use of microsensors for in-field monitoring of environmental parameters is gaining interest due to their advantages over conventional sensors. Among them microsensors based on semiconductor technology offer additional advantages such as small size, robustness, low output impedance and rapid response. Besides, the technology used allows integration of circuitry and multiple sensors in the sa...

This work presents the Ion-Sensitive Field Effect Transistor (ISFET) fabrication and electrical characterization for hydrogen peroxide sensing. Two configurations were set up to evaluate devices sensitivity concentration of solution. First, measurements with one electrode in sample solution (contained over gate area) performed, but results may not be directly related characteristics solution, d...

Herein, we propose a transparent high-performance extended-gate ion-sensitive field-effect transistor (EG-ISFET) using an electrospun indium-tin-oxide (ITO) nanofiber sensing membrane with high specific surface area. Electrospinning is simple and effective technique for forming nanofibers. Nevertheless, one-step calcination, such as conventional thermal annealing or microwave annealing, cannot ...

Abstract Ion-sensitive field-effect transistors (ISFETs) have gained a lot of attention in recent times as compact, low-cost biosensors with fast response time and label-free detection. Dual gate ISFETs been shown to enhance detection sensitivity beyond the Nernst limit 59 mV pH ?1 when back dielectric is much thicker than top dielectric. However, back-dielectric limits its application for ultr...

Chemical sensors are one of the oldest fields of research closely related to the semiconductor technology. From the IonSensitive Field-Effect Transistors (ISFET) in the 70’s, through MicroElectro-Mechanical-System (MEMS) sensors from the end of the 80’s, chemical sensors are combining in the 90’s MEMS technology with LSI intelligence to devise more selective, sensitive and autonomous devices to...

A new measuring method is described for obtaining a proton titration curve. The curve is obtained from a microporous composite membrane, consisting of polystyrene beads in an agarose matrix, with lysozyme molecules adsorbed to the bead surface. The membrane is incorporated into a sensor system by deposition on a silicon chip with a pH-sensitive ion-sensitive field effect transistor (ISFET) loca...