A field effect glucose sensor with a nanostructured amorphous In-Ga-Zn-O network

Area of Science:

• Materials Science
• Nanotechnology
• Biotechnology

Background:

• Amorphous indium gallium zinc oxide (IGZO) field-effect transistors (FETs) are emerging electronic components.
• Nanostructured materials offer unique properties for advanced applications.

Purpose of the Study:

• To fabricate and characterize IGZO FETs utilizing a nanostructured network for biosensing.
• To evaluate the performance of these devices for glucose detection.

Main Methods:

• Fabrication of nanostructured IGZO networks using colloidal lithography and electrohydrodynamic printing.
• Functionalization of the IGZO surface with aminosilane and glucose oxidase.
• Electrical characterization of the FETs under varying glucose concentrations.

Main Results:

• Achieved an 8 μm wide nanostructured close-packed hexagonal IGZO network.
• Demonstrated a drain-source current on-off ratio of 6.1 × 10³ and electron mobility of 3.6 cm² V⁻¹ s⁻¹.
• Observed decreased conductance and a positive shift in V<0xE2><0x82><0x92>N with increasing glucose, indicating sensitive detection.
• Showcased a reversible response with short response times and selectivity against interferents like acetaminophen and ascorbic acid.

Conclusions:

• Nanostructured IGZO FETs exhibit enhanced sensitivity for glucose sensing compared to non-nanostructured counterparts.
• The developed IGZO FETs show potential for advanced biosensor technologies.
• Surface functionalization and nanostructuring are key to improved sensor performance.