Novel graphene transistor architecture improves sensor stability and sensitivity in liquid environments

The team engineered a dual‑gate GFET that integrates a high‑κ hafnium dioxide (HfO₂) local back gate with an electrolyte top gate, coupled through a real‑time feedback control loop. This novel configuration enables capacitive signal amplification while suppressing gate leakage and low‑frequency noise – two sources of instability that have long limited the performance of conventional single‑gate GFETs used in liquid sensing.

Researchers at Penn State have developed a graphene-based field-effect transistor (GFET) architecture that improves sensor stability and sensitivity in liquid environments, marking a step toward real-time molecular detection for health, environmental, and industrial applications.The team engineered a dual‑gate GFET that integrates a high‑κ hafnium dioxide (HfO₂) local back gate with an electrolyte top gate, coupled through a real‑time feedback control loop. This novel configuration enables capacitive signal amplification while suppressing gate leakage and low‑frequency noise – two sources of instability that have long limited the performance of conventional single‑gate GFETs used in liquid sensing.

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