High-Performance Flexible Graphene Field-Effect Transistors and Multistage Inverter Chains for Signal Amplification

Graphene is a promising material in the realm of flexible electronics, offering exceptional properties for advanced device fabrication. In this study, we present an optimized fabrication process for flexible graphene field-effect transistors (GFETs), achieving an intrinsic voltage gain of 6 dB. Furthermore, we demonstrate the development of multistage graphene inverter chains, successfully realizing a three-stage graphene inverter cascade on a flexible substrate, integrating six flexible GFETs with a total gain of 15.6 dB. The potential of these graphene-based inverter chains for signal amplification is illustrated through the successful amplification of heart rate signals, showcasing their application in flexible bioelectronics.