Figure 2.

Multiplex, wireless, and graphene‐based biosensors for SARS‐CoV‐2 antigen and antibody detection (RapidPlex). a) Schematic illustration of salivary and blood viral antigen multisensing using enzyme labeled antibodies as biorecognition element. The produced current from substrate oxidation is transferred by a BLE module to a smartphone with a customized app. b) Rapid and cheap ($0.05) mass production of laser‐engraved flexible sensor arrays, c) disposable and flexible sensors, and d) rapidplex system integration with a PCB with built‐in potentiostat, signal processing, and Bluetooth communication. Adapted with permission.^{[ 44 ]} Copyright 2020, Elsevier.