High‐Precision Multiplex Chemical Sensors with Pattern‐Recognition Capability via a Letter Printing‐Inspired Transfer Method

Graphene-based chemical sensors offer high sensitivity owing to exceptional charge transport and a large surface-to-volume ratio, yet reliable discrimination across diverse analytes remains challenging. In this study, a letterpress-inspired, one-step transfer-printing strategy integrated with pattern-recognition analysis is proposed to implement multiplexed chemical sensor arrays based on graphene field-effect transistors (GFETs). By tuning interfacial adhesion between functional materials and a polymer stamp, accurate and area-selective functionalization with sub-10 µm feature sizes is achieved, thereby enabling simultaneous multifunctionalization of graphene. The resulting 3 × 3 GFET sensor arrays, comprising both functionalized and pristine channels, generate distinct sensing response patterns to representative volatile organic compounds, including chlorobenzene, toluene, and methanol…