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

Qi Zhang,Himadri S Majumdar,Matti Kaisti,Alok Prabhu,Ari Ivaska,Ronald Osterbacka,Arifur Rahman,Kalle Levon

Electron Devices, IEEE Transactions （2015）

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摘要

Electrically conducting polymers are advantageous hybrid materials for microelectronic biosensors due to their high bandgap sensitivity, possibilities for nanoscale surface area formation, and well-developed surface bioconjugation strategies. In this paper, we investigated whether those organic conductors can also be used to functionalize ion-sensitive floating-gate field-effect transistors (ISFGFETs) designed to measure biological binding events. We first subjected our device to 100% relative humidity (RH) and proved its viability in such a humid environment. Subsequently, we drop-casted viscoelastic polyaniline emeraldine salt on pristine transistors to construct organo-functionalized devices. The modified ISFGFETs were stable in aqueous environments and sensitive to cationic polyethyleneimine. The directions of the ISFGFET threshold voltage (VT) shifts agree with the corresponding open-circuit potential variations for the same reaction and pH-sensitive behaviors of Al2O3 sensing layer on the transistor. Such organo-modified ISFGFET sensor arrays are promising alternatives to traditional conductive polymer-based potentiometric biosensors due to their signal amplification, high throughput, and scalability advantages.

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关键词

alumina,biological techniques,biosensors,conducting polymers,ion sensitive field effect transistors,al2o3,isfgfet threshold voltage,aqueous environments,biological binding event,cationic polyethyleneimine,conductive polymer,field-effect transistors,ion-sensitive floating-gate fet,open-circuit potential variation,organic conductors,organic electronics,organo-functionalized devices,organo-modified isfgfet sensor array,ph-sensitive behaviors,potentiometric biosensor,pristine transistors,relative humidity,signal amplification,surface functionalization,viscoelastic polyaniline emeraldine salt,ion-sensitive floating-gate field-effect transistors (isfgfets),open-circuit potentiometry (ocp),polyaniline (pani),polyethyleneimine (pei),threshold voltage ( $v_{rm t}$ ),threshold voltage (vt).,threshold voltage,passivation,electrodes,field effect transistors,transistors,sensors

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