Printing graphene for flexible electronics and sensing

A rapid low-cost technology for the production of laser-scribed highly conductive reduced-graphene oxide (rGO) thin films on flexible substrates is developed. Isolated rGO films, up to 30nm thick and with a conductivity of 10^2 S/m, are produced at room temperature in a three-step process: filtering of a GO solution through nitrocellulose membranes, reduction of the GO surface using a DVD-burner laser, and solvent-free transfer of the resulting rGO pattern onto new substrates via pressure-based mechanism. The rGO is characterized with several analytic techniques, and its synthesis, thickness, morphology, electrochemical and electromechanical properties are investigated and optimized. The validity of the technology is proved over a wide variety of substrates, and its applicability demonstrated as sensing platform for dopamine detection and electrochemical immunoassay, as well as metal contact in electroluminescent lamp