کنفرانس بین المللی میکروالکترونیک ایران

صفحه اصلی / ششمین کنفرانس بین المللی میکروالکترونیک ایران

Enhanced sensitivity of ISFET pH-sensor utilizing reduced Graphene Oxide

نویسندگان :

Hossein Rezaei Estakhroyeh¹ Mahdiyeh Mehran² Esmat Rashedi³

1- دانشگاه شهید باهنر کرمان 2- دانشگاه شهید باهنر کرمان 3- دانشگاه تحصیلات تکمیلی صنعتی و فناوری پیشرفته کرمان

کلمات کلیدی :

Gate-Sensing Layer،Ion-Sensitive Field-Effect Transistor ISFET،Reduced Graphene Oxide،pH-sensor

چکیده :

With an emphasis on the sensitivity of various gate-sensing layers, the current work sought to examine how well Ion-Sensitive Field-Effect Transistors (ISFETs) function as pH sensors. Reduced Graphene Oxide (rGO) has been investigated as a potential sensing material for ISFET sensors, however Metal Oxides have historically been the material of choice for the gate-sensing layer because of its stability and dependability. ISFET sensors using rGO as the sensing material and those with traditional Metal Oxide gate layers were thoroughly compared. The performance of the sensors was assessed under a range of operating situations by multiphysics modeling with finite element methods using COMSOL Multiphysics software. The results showed a considerable improvement in sensor performance when rGO was used as the gate-sensing layer. A lower threshold voltage needed to activate the sensor and a higher sensitivity to pH variations were two of these enhancements. In ISFET sensors for pH monitoring, this work emphasizes the benefits of adopting alternate gate materials, such rGO. For the purpose of creating more dependable and efficient pH-sensing instruments for a range of scientific and industrial applications, it is helpful to analyze the fundamental mechanics and performance characteristics of the sensors. The results show that rGO-ISFETs have a higher sensitivity to pH variations and a lower threshold voltage (approximately 0.7988 V), with a sensitivity of 59.7 mV/pH compared to 58.2 mV/pH for Ta2O5-based sensors. These results suggest that rGO-based ISFET sensors have higher sensitivity and better discrimination capabilities, making them more suitable for the precise pH measurement in the scientific and industrial applications.