InGaZnO transistor based on porous Ag nanowire-functionalized gate electrode for detection of bio-relevant molecules

- New sensing platform of IGZO thin film transistor (TFT) combined with Ag nanowire mesh porous gate electrode has been suggested.
- The IGZO TFTs with Ag NW mesh top gate electrode rapidly respond to chemical/biologically relevant analytes by shifting the turn-on (or threshold) voltage.
- Flexible IGZO TFT and inverter based sensors were demonstrated.

We report on InGaZnO (IGZO) thin film transistors (TFTs)-based bio-chemical sensors which can detect the chemical/biological species. As novel sensing platform, the IGZO TFT with Ag nanowire (NW) mesh showed pronounced output voltage changes responding to all analytes of H2O2, b-d-glucose, d-glucono-1,5-Lactione, and lactic acid, which are reproducible and reversible. Herein, porous Ag NW-functionalized top gate electrode plays a major role in sensing platform for enhanced sensing capability in aqueous medium. Moreover, these top gate geometry serve as a stable backplane for electrical modulation. As a result, analytes solutions become acidic or basic and such pH alterations induce significant turn-on voltage shifts on our devices. For implementation of a resistive load inverter, the output sensing voltage signals can be directly extracted, and such signals are reproducible and reversible. The proposed IGZO TFTs with Ag NW mesh top gate electrode based sensing platform pave the way for development of portable and reusable real-time non-destructive label-free chemical/biological sensors.

A new sensing platform using InGaZnO metal oxide thin film transistor (TFTs) and Ag nanowire mesh gate electrode is proposed, which detect biologically relevant species such as H2O2, b-d-glucose, d-glucono-1,5-Lactione, and Lactic acid in aqueous media.163