Environmentally Friendly Conductive Screen‐Printable Inks Based on N‐Doped Graphene and Polyvinylpyrrolidone

The development of polymer‐based conductive inks has gained increasing interest in the areas of printed and molded electronics. Graphene‐based materials are explored in this scope, reduced graphene oxide (rGO) being among the most used conductive filler components of the inks. Herein, rGO is doped with nitrogen to obtain N‐rGO; the replacement of oxygen atoms by nitrogen ones increases the electrical conductivity of graphene. Polymer‐based conductive inks reinforced with graphene are developed based on polyvinylpyrrolidone (PVP) as polymer binder and dihydrolevoglucosenone (Cyrene) as solvent, leading thus to environmentally friendly conductive inks. Screen‐printable inks are optimized in terms of viscosity and adhesion properties, leading to printed films with sheet resistance close to Rs = 1 kΩ sq−1, the graphene:PVP inks being also biocompatible and nontoxic.