Laser-Induceed Graphene stamp for High Performance Electrochemical Sensing Applications
Here, we newly proposed laser-induced graphene (LIG) stamp to transfer directly it onto Au substrate from polyimide (PI) substrate. The stamped-LIG was strongly adhered by van der waals force with Au. Unlike conventional transferred LIG electrode composed of totally carbon-based material, the proposed LIG stamp was formed with several layers of carbon on top of highly conductive Au electrode resulting in the improvement electrical and electrochemical properties. In addition, we successfully electrodeposited Pt nanoparticles (PtNPs) as catalytic material on the surface of the stamped LIG for electrochemical biosensor applications, which also resulted in highly improved redox characteristics. We characterized and compared various materials such as Au, Au/PtNPs, Au/stamped-LIG, and Au/stamped-LIG/PtNPs through cyclic voltammetry and amperometric measurement. As a result, the electrical and electrochemical redox properties were much improved. Through amperometric measurement, the developed electrochemical sensor electrode indicated 69.33 μA/mM·cm 2 of the sensitivity at hydrogen peroxide concentration of 10 to 3760 μM and limit of detection of 2.2 μM, respectively.