Surface Functionalization of Ion-Sensitive Floating-Gate Field-Effect Transistors With Organic Electronics


Electrically conducting polymers are advantageous hybrid materials for microelectronic biosensors due to their high bandgap sensitivity, prospects for nanoscale surface area formation, and well-developed surface bioconjugation methods. In this paper, we investigated whether or not those organic conductors can additionally be used to functionalize ion-sensitive floating-gate field-effect transistors (ISFGFETs) designed to live biological binding events. We initial subjected our device to 100% relative humidity (RH) and proved its viability in such a humid atmosphere. Subsequently, we have a tendency to drop-casted viscoelastic polyaniline emeraldine salt on pristine transistors to construct organo-functionalized devices. The changed ISFGFETs were stable in aqueous environments and sensitive to cationic polyethyleneimine. The directions of the ISFGFET threshold voltage ( $V_mathrm T)$ shifts consider the corresponding open-circuit potential variations for the identical reaction and pH-sensitive behaviors of Al2O3 sensing layer on the transistor. Such organo-changed ISFGFET sensor arrays are promising alternatives to ancient conductive polymer-primarily based potentiometric biosensors due to their signal amplification, high throughput, and scalability blessings.

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